x402 Content Classifier

Classify text or structured data into categories using Claude AI. Optional confidence scoring and multi-label output. Part of the x402 micropayment task market.

Live service: https://project-classifier-production.up.railway.app (pending deployment)
Smithery: gary-edgington/x402-content-classifier (pending submission)
Payment: $0.005 USDC per call · x402 v2 · Base mainnet

Supported Classification Modes

Endpoints

POST /v1/classify — Paid

Requires x402 payment header. $0.005 USDC on Base mainnet.

Request body:

{
  "input": "<text or JSON string to classify>",
  "input_type": "text",
  "preset": "sentiment",
  "taxonomy": [],
  "multi_label": false,
  "explain": true
}

Query params:

• ?multi_label=true — return ranked list of all matching labels rather than a single top label.

Response (200):

{
  "label": "positive",
  "confidence": 0.92,
  "labels": [
    {"label": "positive", "confidence": 0.92},
    {"label": "neutral", "confidence": 0.06},
    {"label": "negative", "confidence": 0.02}
  ],
  "reasoning": "The text expresses strong satisfaction and approval with no negative indicators.",
  "meta": {
    "preset": "sentiment",
    "multi_label": false,
    "input_type": "text",
    "model": "claude-haiku-4-5"
  }
}

Response (402 — no payment):

{
  "x402Version": 2,
  "accepts": [{
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "payTo": "0x8fC4006534801c17A3368075A1Fb3b3C511EdB1F",
    "maxTimeoutSeconds": 300
  }],
  "error": "Payment required"
}

POST /v1/classify/trial — Free

No payment required. Same classification logic. Limits: 4KB max input, single-label only, sentiment and topic presets only.

GET /health

{ "status": "ok", "service": "classifier-agent", "version": "0.1.0" }

MCP Tool

This service exposes a single MCP tool via SSE transport for use with MCP-compatible agents and Claude Desktop.

SSE endpoint: https://project-classifier-production.up.railway.app/sse

classify_content

Classify text or structured data into a category using Claude AI.

x402 Payment Details

Pipeline Example

Agents can chain services via the A2A hub discovery manifest:

Raw CSV → Formatter (/v1/format) → Classifier (/v1/classify)
Raw JSON → Schema Checker (/v1/schema-check) → Classifier (/v1/classify)

Each hop settles independently on Base mainnet via x402.

Ecosystem

This service is part of a three-service x402 task market:

• SchemaCheck Agent — JSON Schema validation
• Formatter — data format conversion
• Classifier (this service) — content classification
• A2A Hub — service discovery

Full capability manifest: GET https://project-a2a-production.up.railway.app/v1/capabilities