#x402

Daily, Ed25519-signed security intelligence for AI-agent stacks: CVEs, supply-chain incidents and advisories (GHSA/CISA-KEV/OSV/NVD + national-CERT) assessed for MCP/LLM-proxy impact, cross-validated and signed. Paid via x402 ($0.10 USDC on Base); free sample, list_available, check_affected, get_since.

Hosted MCP server: 99 read-only blockchain tools — analytics, security scans, contract reading, tx simulation, wallet lookups, DeFi & market data — across Bitcoin, Stacks, Solana, 60+ EVM chains, Hyperliquid, TON & Sui. Most free; premium tools pay-per-call via x402.

Precision calculators for AI agents (medical, finance, engineering, tax, physics). Pay-per-call in USDC via x402 on Base. No API keys.

Open-source MCP server with ~1,100 deterministic tools — web search, headless Chromium, PDFs, OCR, images, ~1,040 CPU utilities. Free to self-host or pay per call via x402 (USDC on Base).

Pay-per-call x402 MCP data layer for AI agents. One endpoint, no API keys, USDC settlement on Base.

Free AI research/OCR + agent-economy discovery tools (120+ tools, no-auth), includes engage_sasame to commission SaSame to build MCP/Claude/RAG/agents, full deliverables pay-per-call via x402

Provision, SSH into, run commands on, and manage Linux VPSes from an AI agent. Pay USDC over x402 (Base) or by card over HTTP 402, with a running box in under 60 seconds. No signup, no API key to buy. Includes get_catalog, provision_server, get_server, list_servers, extend_server, reboot_server, server_logs, exec_command, destroy_server, claim_account, verify_claim.

The verification layer for autonomous agents — a neutral, capital-scale-aware verdict before an irreversible action (review), a signed portable proof after (prove), and a public, on-chain-verifiable track record anyone can check without trusting us (ledger / verify-proof). Pay-per-use via Bitcoin Lightning (L402) or USDC on Base (x402); free registration.

Engagement marketplace on Base, native to the Bankr ecosystem: AI agents and communities fund quests (follows, reposts, replies, quotes, original posts); verified-X humans complete them and are paid per approved action from a non-custodial x402 escrow — in USDC, BNKR, or any Bankr-launched token.

Pay-per-call MCP server for AI agents. Check whether ChatGPT, Perplexity, or Google AI recommends any brand — score 0-100, mention rate, and the competitors AI names instead. Also serves the 25-brand AI Visibility Index dataset, US Treasury macro data, DeFi yields, crypto prices, and trucking load-profit calculators. Paid tools settle per call in USDC on Base via x402 — no API keys, no signup. Install in Claude Desktop or Cursor. Premium brand check $0.95. Free human checker: https://aivisibility.agentexchange.work · Leaderboard: https://index.agentexchange.work

Remote MCP server with 10 tools: live brand AI-visibility audits (score 0-100, who AI recommends instead), AI Visibility Index dataset (25 brands, 5 industries), trucking profit & cost-per-mile calculators, DeFi yields, crypto prices, US Treasury rates, and macro risk-spread. Free catalog tool; paid tools are machine-payable per call via x402 (USDC on Base) — no API keys or subscriptions. Endpoint: https://x402-agent-store.rileycraig14.workers.dev/mcp

LiveAuth MCP Server gives AI agents cryptographic proof-of-work + Lightning Network authentication. Agents solve a PoW challenge, get a signed JWT, and use it to call paid MCP tools. Each tool call is metered in sats and recorded as a signed revenue event with a verifiable receipt. Built on L402 (the Lightning-Native HTTP 402 protocol from Lightning Labs). Compatible with x402 (Cloudflare/Coinbase). Non-custodial — no KYC, no account, no email. Pay per call in sats over Lightning. Install: `npx -y @liveauth-labs/mcp-server` Docs: https://docs.liveauth.app/mcp-liveauth-gate Source: https://github.com/dulzuradev/liveauth-mcp

Bitcoin blockchain data server for AI agents — 17 tools (fees, mempool, transactions, address portfolio, trace, whales, SEC insider trades, web scraping, AI summarization, systems theory, game theory, capital flows, Reddit). x402 USDC micropayments on Base. No API keys needed.

Agent-native forum for the x402/A2A ecosystem. The hosted MCP server exposes the whole forum as tools — threads, comments, votes, USDC bounties (x402 on Base), provider reviews, and search.

x402 Trust Layer is the trust, security & settlement control plane for autonomous agent payments. It exposes 13 MCP tools that an agent calls around every x402 (HTTP 402) payment: - Preflight guard (spend policy + identity + URL/SSRF risk) - Know-Your-Merchant (KYM) trust & wash-trade scoring - AP2-style mandate compile & diff vs actual tool trace - Semantic delivery escrow with auto-refund on bad responses - On-chain settlement receipt verification - Agent Trust Protocol v4: passport, fraud scan, credit score, trust score v2 No API keys — the agent pays per call in USDC on Base / Solana / Polygon via the Dexter / Coinbase CDP facilitator. Works with Claude Desktop, Claude Code, Cursor, and any MCP client. Live API & dashboard: https://x402trustlayer.xyz/dashboard

Verifiable document intelligence for AI agents. Extract, summarize, translate, claim-check, and notarize PDFs & URLs. Evidence bundles with cryptographic proofs and on-chain attestation. 20 MCP tools.

Remote MCP server for geographic data — earthquakes, tsunamis, volcanoes, hurricanes, floods, tornadoes, FX rates, UN SDG, World Factbook, WorldPop. Free discovery + free packs; earthquakes & tsunamis paid via x402 on Base USDC. Start with get_catalog, then get_pack.

A wallet for your agents to onboard and pay. Agentic MPP / x402 payments from your machine - CLI + MCP server.

EnergyAI MCP — home-energy decision tools for the agent economy: Energy Node scoring, personalized solar/heat-pump/battery recommendations, honest 2026 incentive lookups (worldwide), and Quote Guardian quote review. Pay-per-call micropayments (x402); lead submission is free and pays a 20% bounty on conversion. Free tools to start: create/answer/complete assessment. Register for a key at https://api.energyaisolution.com/api/v1/merchant/register

Access 300+ travel APIs through a single MCP. Look up airport data and codes, search flights and airlines, find hotels via Booking.com, check currency exchange rates, and more. Pay-per-call in USDC via x402 on Base — no API keys, no subscriptions.

Access 2,300+ e-commerce and retail APIs through a single MCP. Look up barcodes and UPC codes, search Walmart and eBay products, parse product pages, and more. Pay-per-call in USDC via x402 on Base — no API keys, no subscriptions.

Access 8,000+ web research and data extraction APIs through a single MCP. Search the web, scrape content, query Reddit, pull Google results, extract structured data, and more. Pay-per-call in USDC via x402 on Base — no API keys, no subscriptions.

Access 1,900+ blockchain and DeFi APIs through a single MCP. Estimate gas fees, analyze wallets, score on-chain volume, label addresses, and more. Pay-per-call in USDC via x402 on Base — no API keys, no subscriptions.

420+ deterministic fintech tools - agentic payments (AP2, x402, Visa TAP, A2A), AML/KYC, BaaS comparison, MCP dev tooling - with 15 flagship tools as interactive MCP Apps widgets. Remote streamable HTTP, read-only, no auth, zero PII.

Mercury is a pay-per-call MCP server that lets AI agents discover and call financial data tools using the x402 HTTP payment protocol. 18 tools covering crypto prices, DeFi liquidity, NFT data, on-chain analytics, and more. tools/list is free — tools/call is billed per call using your Mercury API key. Connect by URL: https://network.mercury-hq.com/mcp

Mercury is an MCP server + API where your AI agent pays for web data itself. It discovers a service, pays per call over x402 (or a free API key — no crypto needed), and gets back clean data plus an EIP-191 signed provenance receipt it can verify offline. 18 keyless services — fetch, extract, markdown, metadata, links, tables, feeds, sitemaps, DNS, diff, notarize — ~$0.003–0.02 a call, on 6 chains (Base, Polygon, Avalanche, Sei, IoTeX, peaq). npx mercury-x402-mcp for Claude / Cursor / Cline.

Hand any AI agent a budget-capped wallet to pay, discover & register x402 payment-gated URLs across every chain. Local, self-custodial, no backend, no fee.

51 AI-powered Intelligence verticals - finance, immigration, legal, health, crypto, real estate, careers, travel, compliance and more. x402-native, pay-per-query via USDC on Base. No API keys, no subscriptions.

Discover agent-callable resources by intent — x402 paid services, MCP servers and A2A agents — via the agent-tools.cloud directory. 9 tools: search/get/list_categories (x402), search_mcp_servers/get_mcp_server, search_agents/get_agent, search_all, stats.

Real-time Solana memecoin intelligence for AI agents and trading bots — KOL wallet trades, Pump.fun deployer reputation, token quality scoring, wallet PnL, and pre-confirm launch alerts. 40+ tools. Free API key, or pay-per-call via x402.

Pay-per-call AI agent APIs on Base via x402 — 39 endpoints spanning USPTO patents, US law, academic papers, OFAC sanctions screening, geocoding, weather, AI utilities, image rendering. No signup or API keys — each call settles instantly in USDC.

Universal product search across 40+ stores (Amazon 22 countries, eBay 22 countries, Awin 15k merchants, AliExpress, SaaS, B2B) — 52 languages, x402 micropayments.

Budget & cost control for AI agents: hard per-agent spend caps, rate limits, idempotency, and human-in-the-loop approval — enforced before each LLM call, not after the invoice. One hosted MCP endpoint (no proxy or self-hosting), settled via x402 (USDC on Base).

Times Rare is a 1,000,000-pixel public canvas where verified AI agents claim permanent image blocks to advertise services to other agents. Agents-only network — humans cannot claim. Verification via OpenAI / Anthropic / Google / xAI / Mistral API-key handshake OR x402 USDC payment on Base L2. Inflation-adjusted Million Dollar Homepage for the 2026 agent economy. $1.5M revenue ceiling at full sellout. Every claim is permanent. Discovery surfaces include /mcp.json, /agents.json, /llms.txt, /.well-known/agent.json, /.well-known/ai-plugin.json, /.well-known/adagents.json, /openapi.json. The canvas itself is browseable + payable via standard HTTP — no stdio or local install required.

Give AI agents access to 13,000+ IT certification practice questions across 26 certs (AWS, Azure, GCP, CompTIA, CISSP, PMP, Kubernetes, Terraform, Cisco, Salesforce). Pay-per-call via x402 USDC micropayments on Base, or a prepaid API key. Tools: get_cert_questions, list_certifications.

Pay-per-call live company intelligence for AI agents via x402 (USDC on Base). No signup, no API key — name a company, get fresh data instantly.

Open AI agent marketplace. Register your bot free, earn USDC per call. x402 payments on Base. 85% dev share. A2A + MCP protocol.

221 AI-powered crypto security tools across 13 blockchains. Scam detection, wallet forensics, whale tracking, contract auditing, market analysis. Built for AI agents (Claude, Cursor, Windsurf, ChatGPT). Free trials on every tool. Pay-per-use via x402 (USDC). No API key required. Part of Rug Munch Intelligence — The Bloomberg Terminal of Shitcoins

Pay-per-call AI agent APIs on Base via x402 — 39 endpoints spanning USPTO patents, US law, academic papers, OFAC sanctions screening, geocoding, weather, AI utilities, image rendering. No signup or API keys — each call settles instantly in USDC.

CDK is a remote MCP server (streamable-HTTP) for purchasing digital products. 8 tools: search_games, get_game_details, browse_filters, get_price_quote, confirm_purchase, check_order, request_refund, submit_review. Payment via x402 protocol — USDC on Base for direct onchain payment, or Coinbase Onramp for card/PayPal/Apple Pay. Every product response includes live competitor prices for transparency. 30-day refund window with onchain-verified payouts.

Discover and call 219+ paid x402 endpoints from x402node.dev (utilities, wallet analysis, OCR, translation) and cn402.com (Chinese culture: bazi, feng shui, i ching, TCM). Auto-handles USDC payment on Base via x402-fetch. Compatible with Claude Desktop, Cursor, Cline.

Runtime security oracle for AI agents — scan prompts, tool calls, and outputs before execution. Pay-per-call via x402/USDC, no accounts needed.

Sovereign cryptographic oracle — 131 Ed25519-signed endpoints across crypto prices, FX, metals, stablecoins, economic indicators, commodities, gas oracles, volatility/sentiment/stress/contagion indices, marine, weather, DeFi yield, and COT positioning. Pay-per-query via x402 (USDC on Base). No API keys.

14 paid APIs for AI agents. gulf arabic NLP, email verification, legal analysis, web scraping + more. USDC on base. no auth. no accounts. just pay and get data.

Gulf Arabic sentiment analysis, Arabizi transliteration, web scraping, crypto data, weather, and domain enrichment. 7 pay-per-request. APIs optimized for GCC/Middle East. Powered by x402 protocol (USDC on Base).

9 autonomous crypto intelligence tools paid via x402 USDC on Base. Whale alerts, DeFi yields, GODMODE agents ($25-$500), narrative detection, liquidation prediction and more. Any AI agent can discover and pay autonomously.

AI-native parametric insurance infrastructure. Assess weather risk, generate quotes, bind policies, and monitor triggers programmatically. Live paid endpoint via x402 (USDC on Solana).

Marketplace MCP for paid HTTP APIs. Pay per call in USDC on Base via the open x402 standard. Non-custodial — keys stay in env.

100+ agent-payable C-suite expertises (competitive intel, SEC filings, sanctions, KYC, clinical evidence, RE deals, ESG, NAICS classifier, research paper Q&A). 183 tools. x402 USDC/EURC. Free 100 calls/mo, no credit card.

Web3 MCP server for machine-paid agent commerce: T54 XRPL x402 SKUs (OpenAPI tools) plus Base USDC EVM contract triage, full audit, and monitoring. Streamable HTTP at api.agentic-swarm-marketplace.com/mcp; stdio via scripts/mcp_server.py. HTTP 402 + broker settlement — not trading or speculation.

Mixture-of-Agents document intelligence engine. Multiple AI models cross-verify each other for 100% recall — hallucination-free results across 10 languages. 6 tools (2 free), Vision OCR for scanned PDFs, x402 micropayment (USDC on Base/Solana), from $0.01/call.

Market-aware paid decision preflights before larger agent tool spend, helping agents decide what to buy, skip, or stop.

Pre-listing readiness checks for paid x402 and MCP tools, including public metadata, unpaid 402 behavior, launch packs, and bounded receipts.

Pay-per-success public-data result packs for AI agents with free quotes, source URLs, confidence, timestamps, and receipt hashes.

Pay-per-call MCP server. Vetted human experts review AI content, audit reasoning, gate approvals, and convene think-tank working sessions. 9 paid tools $1–$15, USDC on Base via x402.

Institutional AI trading intelligence for autonomous agents. Real-time squeeze scanner, AI council verdicts, options flow, IWM 0DTE scoring — gated by x402 RLUSD micropayment on XRPL. No API keys. Agent Credit Bureau, Peer Signal Marketplace, Agent Hiring Protocol. Free demo at /api/demo.

x402/HTTP 402 payment compliance firewall + AI Agent Credit Bureau. World's first agent reputation scoring system (300-850 FICO-style). Verify RLUSD (XRPL) or USDC (Base) payments, issue access tokens, track agent passport, loyalty tiers, and portable attestation JWTs. Zero custody.

Institutional AI market intelligence for autonomous agents. Real-time squeeze scanner, options flow, IWM 0DTE analysis, multi-engine AI council verdicts, peer signal marketplace, agent hiring protocol, prediction futures market, and agent-to-agent conditional settlement. Pay-per-call with RLUSD (XRPL) or USDC (Base). 23 MCP tools. Zero simulation, absolute execution.

AI scheduling assistant for agents. Timezone conversion, public holidays for 100+ countries, business hours checker, multi-timezone meeting slot finder, and Google Calendar event creation. x402 native — pay $0.01 per call, no signup needed. Works with Claude, ChatGPT, Cursor and all MCP clients.

x402-native clean reader. URL in → markdown out. $0.002/call, no signup.

AI agents make decisions you can't audit. Lemma fixes that with zero-knowledge proofs over confidential documents — selective disclosure, on-chain provenance, no plaintext exposure. Query cryptographically verified attributes from agents in production. Built for regulated industries and x402/MCP-native developers. Models change. Proofs remain.

NameIntel is a remote MCP server that scores brand names across five dimensions in a single call: domain availability, USPTO trademark conflict screening, social handle availability across 12+ platforms, SEO keyword strength, and AI findability (GEO score — industry-first; measures how findable a name is in ChatGPT, Perplexity, Claude, and Gemini answers). Pricing is $0.01–$0.05 per call in USDC over the x402 micropayment protocol on Base and Solana. There are no API keys to provision, no accounts to register, and no rate-limit forms to fill out. Payment is authentication. Built for the AI agent economy: when an autonomous agent helps a founder start a company, NameIntel is the tool that agent calls. Registered in the official MCP Registry as io.nameintel/server. Tools (5): - score_name — 5-dimensional composite score ($0.05 USDC) - check_domain — domain availability across TLDs ($0.01 USDC) - check_trademark — USPTO trademark conflict screen ($0.01 USDC) - check_social — handle availability, 12+ platforms ($0.01 USDC) - check_geo — AI findability score, industry-first ($0.03 USDC) Install (Claude Code): claude mcp add --transport http nameintel https://mcp.nameintel.io/mcp Homepage: https://nameintel.io REST API: https://api.nameintel.io License: MIT (public mirror); commercial pay-per-call for the hosted service.

22 MCP tools for Caribbean structured data — solar energy, biodiversity, fishing, agriculture, land, tourism, trade, water infrastructure, SME profiles. Payments via x402 protocol (USDC on Base).

Protocol-neutral market intelligence for the AI agent economy. Multi-signal ranking of AI agents across 4 category methodologies (model families, tokenized, service, developer). 7 read-only MCP tools. Free, no auth, 60 req/min.

AI intelligence oracle + cross-border settlement rail. 10-layer Stability Oracle (climate, macro, FX, ESG, supply chain) with x402 pay-per-call data API. USDC/EURC settlement on Base at 1.385% all-in. GENIUS Act + MiCA + Basel III compliant. 13 tools: macro briefings, ESG scoring, quote, settle, oracle status, competitor comparison, and more.

Stripe for AI agents. Pay any HTTP API in stablecoins or native tokens on Polygon and Solana mainnet with one MCP call. Non-custodial, on-chain settlement, atomic 99/1 partner split. Five tools: payable_fetch, agent_address, agent_quote, pay_with_split, quote_split.

Get AI-powered IT certification practice questions via MCP. Supports 50+ certs (AWS, CompTIA, Cisco, Azure, GCP). Uses x402 HTTP micropayments (~$0.01 USDC per request) on Base network — no subscription needed. Pass an optional API key to skip payment. Built on Supabase Edge Functions with a live HTTP MCP endpoint at getmycert.com/api/mcp.

Classify text or JSON input into structured categories using Claude AI — with no setup, no API keys, and no credentials required. Connect directly and start classifying immediately. Five built-in presets: sentiment — positive, neutral, negative topic — technology, finance, health, legal, science, sports, other intent — question, request, complaint, feedback, informational urgency — critical, high, medium, low custom — supply your own 2–20 label taxonomy Two tools: classify_content — full access: all presets, custom taxonomies, multi-label output, up to 32KB input. Billed at $0.005 USDC per call via x402 micropayment on Base mainnet. classify_content_trial — free tier: sentiment and topic presets, single-label output, up to 4KB input. No payment required. Every call returns the top label, a confidence score, a ranked list of all labels, and an optional one-sentence reasoning string. Supports plain text and JSON input. Part of the x402 micropayment task market — a network of AI agents that charge per call using on-chain USDC micropayments.

16 pay-per-call AI services: code audit, refactoring, DeFi analysis, Solidity scanner, SQL tools, trading signals. Powered by DeepSeek V4 Pro. Payment via x402 USDC.

A discovery hub for AI agents navigating the x402 micropayment ecosystem. A single get_capabilities call returns the full service manifest — endpoint URLs, supported input/output formats, x402 payment details, and free trial endpoints for every live agent in the network. Use this as your first call when orchestrating multi-step pipelines across data transformation, schema validation, and other x402-enabled services. Free — no payment required.

SchemaCheck Agent validates JSON payloads against JSON Schema Draft 7 and 2020-12 standards. Designed for agent-to-agent workflows, it returns structured validation results instantly — including field-level error paths, human-readable summaries, and optionally a corrected payload when repair mode is enabled. Built on the x402 micropayment protocol, each validation call costs $0.005 USDC on Base mainnet — no subscriptions, no API keys, no accounts. Pay per call, settle on-chain.

Pre-trade DeFi intelligence for AI agents on Base. 20 paid x402 endpoints - wallet risk, token security, cross-protocol liquidation health (Aave V3 / Compound v3 / Spark / Morpho), portfolio P&L, DEX quote aggregation, governance LLM summaries, sentiment, and a multi-call bundle endpoint. $0.005–$0.20 per call in USDC. No API key, no signup - the signed EIP-3009 payment is the auth, settles in ~2s via Coinbase's x402 facilitator.

Trust scoring, scam detection, and EAS attestations for ERC-8004 + x402 agents on Base.

AI agent readability scanner — score any public URL against the Vercel Agent Readability Spec, llmstxt.org, and 6 agent-protocol manifests (MCP, A2A, agents.json, agent-permissions, UCP, x402). 59 checks with per-check fix guidance. Same engine as agent-ready.dev.

Torify gives AI agents the Japanese locale primitives that standard libraries lack — imperial era date conversion (wareki), qualified invoice number validation with NTA registry lookup, corporate number lookup (法人番号), postal code resolution, name romanization (Hepburn), and kanji-to-kana conversion via Yahoo! JLP. 10 free MCP tools backed by a 40-endpoint REST API. No authentication required for MCP. 100 calls/month free with email signup, or pay-per-call $0.02/call via x402, or $49/mo Pro subscription.

Curated audio-news MCP server. Search trending articles, fetch narrated audio, subscribe topic feeds. OAuth 2.1 + RFC 7591 Dynamic Client Registration. Free tier; premium briefings via x402 over stablecoin settlements.

MCP wrapper for Askew's x402 endpoints — 8 tools (3 free, 5 paid in USDC on Base): live DeFi yield comparison, SOL/ATOM staking routing, agent-economy research search, Guardian security threat intel, and a combined strategic feed.

AI agent API marketplace — discover, call, and pay for services with USDC. 10 MCP tools for service discovery, agent registration, API calls, and payment settlement. 23 active services from independent providers.

Cross-protocol agent payments discovery hub. 1,551 services across x402 (Coinbase), MPP (Stripe/Tempo), and L402 (Lightning). Intent-based search, quality grades, market intelligence, agent registry. https://api.ideafactorylab.org

MCP server for the XRPL-Utilities portfolio. 11 tools across four services: • XR-Sentinel — classify any XRPL wallet by its on-chain activity pattern. Returns a 0–100 activity_score, a Low/Medium/High/Dormant level, behavioral signals from a 22-entry catalog, top counterparties with XRPScan labels, and an AI-generated reasoning narrative. • XR-Pulse — normalized signal feed mixing public-source news (regulatory press + central banks + crypto media filtered for XRP/RLUSD/XRPL), on-chain whale activity, and XLS-70/80/81 permissioned-domain lifecycle events. Each row carries 4-hour XRPL price correlation, institutional watchlist labels, and Sentinel cross-references. • XR-Telemetry — XRPL macro snapshot. Total/circulating/escrowed/dormant supply, AMM-locked, exchange omnibus, DEX orderbook depth, and a derived Active Float model with the full additive mathematical bridge. Two payment flows: inline x402 OR async invoice (deeplink + QR). • XR-Trust — directory + drill-down for the XRPL permissioned-asset stack. PermissionedDomain (XLS-80) enumeration, credential issuer aggregation, XLS-81 permissioned-DEX trade economics, and XLS-40 DID identity bridge with .well-known/xrp-ledger.toml resolution. Stateless passthrough proxy — every paid call uses the caller's own x402 v2 payment header (XRP or RLUSD), settled on XRPL mainnet via the t54 facilitator. $0.10 USD per query. The MCP server holds no wallets and takes no cut.

16 AI data services on Base mainnet via x402 — crypto intel, equity, energy, real estate, agriculture, news, and an autonomous coding agent. Pay per query in USDC. No API keys.

Pay-per-call x402 data products on Base mainnet — sanctions, aviation weather, US property dossier

TensorFeed is an MCP server for real-time AI ecosystem data. Free tools cover AI news, service status, model pricing, today's summary, agent activity, and the daily MCP server registry snapshot. Premium tools (paid per call in USDC on Base, x402-compatible) cover ranked model routing, news search, history series, cost projection, provider deep-dives, model comparison, and digest watches. AFTA-certified: code-enforced no-charge on 5xx, breaker, schema fail, or stale data, with Ed25519-signed receipts on every paid call.

One endpoint for every AI agent. Free web search, live crypto prices, shared collective memory (The Hive), and x402 pay-per-call with USDC. No signup needed — 10 free calls/day, drop in your agent in 60 seconds.

Production MCP server with 9 financial and web tools — live on Google Cloud Run. Free tools include live FX rates, crypto prices, financial calculations, real-time news headlines, and URL reading. Paid tools (API key required) cover stock quotes, open banking transactions, and Stripe payment data. Supports x402 micropayments ($0.001 USDC/call on Base) with no account needed.

Read-only MCP server for U.S. dental practice intelligence. Four tools cover NPI lookup, multi-field provider search, DSO chain affiliation, and territory market summaries across 41 states plus DC. Authenticate with an API key (Bearer) for subscription pricing, or pay per query via x402 USDC micropayments on Base mainnet. Every response carries a citation envelope with source attribution, snapshot date, and confidence score.

HTTP 402 + USDC pay-per-call API for AI agents. 16 endpoints (QR codes, screenshots, OG images, PDFs, web scraping, WHOIS, YouTube transcripts, AI summarization, plus a 4-endpoint crypto cluster — wallet balances, ENS resolution, gas, coin prices). Two payment rails: x402 (autonomous USDC on Base mainnet, no signup, no API key, server holds zero private keys) or pre-paid credits ($1 = 5 calls via NowPayments). Hosted MCP server included.

AI-native payment infrastructure that gives AI agents isolated wallets with programmable spending policies for autonomous USDC stablecoin transactions. 11 MCP tools for Claude Desktop, Cursor, and Windsurf. Tri-rail support: x402 (HTTP-native micropayments), MPP (session-based streaming), and traditional fiat. Non-custodial wallets with Shamir key splitting, sub-second settlement on Polygon PoS, Base, and Tempo. Free tier, no credit card. Website: https://moltpe.com Reference impl (Apache 2.0): https://github.com/umangbuilds/moltpe-agent-payments

AnchorRegistry is the open provenance layer for the agentic economy. Every digital artifact — code, research, data, models, media, agents, transactions — can be anchored to Base L2 with a permanent, machine-resolvable identifier (an AR-ID). When an AI assistant encounters an SPDX-Anchor or DAPX-Anchor tag in a README, paper, model card, or website, this MCP server lets it resolve the artifact's full provenance record in one call: who anchored it, when, what type it is, manifest hash, and whether the tree has been sealed, retracted, voided, or affirmed. This is the verify-only edition (v0.1). Three read-only, authless tools wrap the public AnchorRegistry verify endpoints. Free, no API key, no account, no rate limit beyond defaults. Future versions will add registration, balance, and seal tools once the MCP credential pattern stabilizes.

PQS is the fastest way to get better output from any AI model. Score any prompt before it hits the model. Get a grade (A-F), score out of 80, percentile, and 8-dimension breakdown across clarity, specificity, context, constraints, output format, role definition, examples, and chain-of-thought structure. Built on PEEM, RAGAS, MT-Bench, G-Eval, and ROUGE frameworks. Pre-flight, not post-hoc. The AI input quality problem is real. PQS solves it. MCP Tools: - score_prompt: Free. Returns grade (A-F), score out of 80, percentile, and full 8-dimension breakdown. No API key needed. - optimize_prompt: $0.025 USDC via x402. Returns a rewritten, higher-scoring version of your prompt with before/after dimension deltas. Requires API key from promptqualityscore.com. HTTP API (x402-native on Base): - /api/score/free: Free. Grade, percentile, and 8-dimension breakdown. No payment required. - /api/score: $0.025 USDC. Single score, pay-per-call. - /api/score/full: $0.125 USDC. Grade, percentile, dimension breakdown, and rewrite. - /api/score/batch: $0.25 USDC. Score multiple prompts in a single call. - /api/preflight: $0.05 USDC. Lightweight pre-flight quality check. Paste a prompt. Get an optimized version. Ship better work. Cheaper than one bad prompt. https://promptqualityscore.com

fomox402 broker + MCP server for last-bidder-wins games on Solana. Drop one URL into Claude / Cursor / Goose / Cline and the agent auto-registers a Privy-managed Solana wallet (faucet-funded with ~0.0024 SOL + $fomox402), bids via x402 micropayments, claims dividends, and plays autonomously. 14 tools wired up — register_agent, place_bid, claim_winnings, claim_dividend, list_games, get_me, etc. Streamable HTTP at https://bot.staccpad.fun/mcp.

MCP server for AI industry intelligence: real-time AI news, service status, model pricing, and 15 paid premium tools (routing, news search, history series, cost projection, forecasting, provider deep-dive, model comparison, webhook watches). Pay-per-call in USDC on Base mainnet, no accounts. Already in the official MCP registry as ai.tensorfeed/mcp-server.

fomox402 is a last-bidder-wins on-chain game on Solana, designed to be played autonomously by AI agents. Every bid mints a key that earns passive $fomox402 dividends; the last bidder when the timer hits zero wins the pot. Drop our MCP server into Claude Desktop, Cursor, Goose, or any HTTP-speaking client to play.

Discover and call paid APIs with USDC credits. No wallet, no gas, no per-provider SDKs

46 MCP tools for AI agent commerce. Escrow with $1K Shield Protection, on-chain reputation (ERC-8004), semantic agent search, confidential escrow (HIPAA/GDPR), dispute resolution, multi-agent orchestration, protocol gateway (A2A/MCP/REST/x402). Agents transact autonomously — no humans required. 3.25% fee. FREE marketplace listing. 0.25% referral income forever. One-call onboard: POST /v1/onboard.

MCP adapter for x402station.io — infrastructure for x402 agentic commerce. Brand umbrella across 6 capability directions: Discover (Catalog), Evaluate (Preflight, the active flagship), Pay (Credits), Monitor (Watch), Recover (Alternatives), Analyze (Forensics). Preflight by x402station.io is the pre-payment evaluation layer: agents call it before every paid x402 request to detect decoys (price ≥ $1000 USDC honeypots), zombie services (100% erroring), dead endpoints, slow responses, and new providers. Auto-signs PAYMENT-SIGNATURE via AGENT_PRIVATE_KEY. Tools exposed: preflight ($0.001), forensics (7-day report, $0.001), catalog_decoys (full blacklist, $0.005), alternatives (routing fallback, $0.005), whats_new (catalog diff, $0.001), buy_credits ($0.50 = 1000 prepaid preflights), watch_subscribe ($0.01 = 30-day webhook alerts), plus free credits_status / watch_status / watch_unsubscribe. Wallet must hold Base mainnet USDC.

UK government data intelligence platform. 14 enriched endpoints with proprietary scoring across company, location, property, environmental, market, trade, education, transport, vehicle, health, energy, legal, and procurement data from 400+ official UK sources.

AI security intelligence on Base. Three paid MCP tools: CVE vulnerability lookup ($0.01), IP/domain reputation check ($0.01), and secret/credential scan ($0.05). Pay-per-call via x402 USDC on Base. No API keys required for callers. Hosted on Cloudflare Workers with per-tool x402 payment challenges.

The first Model Context Protocol server that lets AI agents browse, recommend, compare, and BUY real physical products with USDC stablecoin via the x402 protocol. Wraps hou-tea.com (a Chinese tea store) with 8 agent-native tools: • hou_tea_browse — paginated catalog • hou_tea_recommend — personalized picks (occasion, budget, taste, gift-for) • hou_tea_explain — deep dive on one product (flavor, terroir, brewing) • hou_tea_compare — side-by-side comparison • hou_tea_filter_by_health — sleep/pregnancy/caffeine constraints • hou_tea_get_payment_requirements — emit x402 payment intent • hou_tea_check_order — poll order/payment status • hou_tea_agent_card — discovery metadata Payment is delegated to an x402-capable wallet MCP (e.g. @coinbase/payments-mcp). This server never holds keys or signs transactions — it only emits the payment requirements and verifies on-chain settlement. Works out of the box with Claude Desktop, Cursor, Cline, Continue, Zed.

Trip1 exposes hotel search, rates, and booking as MCP tools. Agents pay in USDC on Base over x402, the open payment protocol built on HTTP 402. Settlement lands inside the same request the agent already made. 3M+ hotels, 200+ countries.

Discover, search, and rank ERC-8004 AI agents by archetype, chain, trust score, and verified on-chain performance.

Xenarch is a non-custodial x402 MCP server. It lets AI agents — Claude, Cursor, LangChain, CrewAI, or any MCP client — resolve HTTP 402 ("Payment Required") responses automatically by signing USDC micropayments on Base L2 (up to $1 per call). Publishers get paid directly through an immutable on-chain splitter contract: 0% fee today, hard-capped at 0.99% forever. Unlike Cloudflare Pay-Per-Crawl, Xenarch works on any host and is fully non-custodial. HTTP 402 has been reserved in the HTTP spec since 1997 — x402 is the open protocol that finally uses it.

Trust and commitment layer for AI agents on Base. Enforceable SLA agreements, on-chain reputation, and x402 micropayments via the Model Context Protocol.

Korean crypto market data + AI analysis for trading agents. 7 tools: AI market read ($0.10, 9 data sources + Claude AI signal), Kimchi Premium, stablecoin premium, Upbit/Bithumb prices, USD/KRW FX rate. Pay-per-use via x402 on Base/Solana.

Know what the market is actually doing — not just price. Live orderflow from 20 exchanges across Bitcoin, Ethereum, Solana, XRP, BNB, Dogecoin, Avalanche, Cardano, Chainlink, and 15 more tokens. Directional regime detection, 7 years of OHLCV with orderflow baked in, on-chain address risk for EVM and Solana wallets. Free here on Smithery. Deploy 24/7 agents via the REST API at x402.tunedfor.ai — no API key, no subscription, pay USDC per call.

x402 micropayment API for AI agents. Execute Python, JavaScript, and SQL code in a secure sandbox. Pay per call with USDC on Base.

Enterprise supply chain intelligence APIs with 100 free calls/day. Live data: freight rates (85+ carriers), port congestion (16 global ports via NOAA), shipping lanes, commodity prices, crypto, forex, economic indicators (FRED), AI inference, blockchain monitoring. x402 micropayments, on-chain trust tiers on Polygon. npm install @cerebrochain/bot-sdk

Scan any website for AI agent readiness — payment protocols (x402, MPP, SPT, L402), MCP servers, OpenAPI specs, llms.txt, plugins, and more. Returns scored reports with 80+ checks.

Streaming AI agent API built on LangGraph. Implements AG-UI, A2A, MCP, and x402 simultaneously. Agents discover it via A2A, call it over SSE, use its tools via MCP, and pay per request in USDC on Base. Per-org MCP federation, pgvector memory, 16 built-in Web3 tools, and dual billing (Stripe + x402).

x402 micropayment API for AI agents. Real-time currency conversion — fiat (ECB) and crypto (CoinGecko). Pay per call with USDC on Base.

x402 micropayment API for AI agents. Generate research reports by fetching and summarizing web sources. Pay per call with USDC on Base.

x402 micropayment API for AI agents. In-memory vector store with cosine similarity search. For RAG pipelines. Pay per call with USDC on Base.

x402 micropayment API for AI agents. Generate images from text prompts using Google Gemini. Pay per call with USDC on Base.

x402 micropayment API for AI agents. AI-powered web search. Returns structured results with titles, URLs, snippets. Pay per call with USDC on Base.

x402 micropayment API for AI agents. Fact-check claims by searching multiple web sources. Pay per call with USDC on Base.

x402 micropayment API for AI agents. Send emails programmatically. Supports text and HTML body. Pay per call with USDC on Base.

x402 micropayment API for AI agents. Shorten URLs with custom aliases. Hash-based short codes. Pay per call with USDC on Base.

x402 micropayment API for AI agents. Extract text from images using OCR. Supports URL or base64 input. Pay per call with USDC on Base.

x402 micropayment API for AI agents. Generate QR codes from text or URL. Returns base64 PNG. Pay per call with USDC on Base.