Wallet Portfolio X402
Wallet Portfolio Tracker API
Full crypto wallet holdings across chains -- ETH, ERC-20 tokens, USD values. Portfolio tracking for agents. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"wallet-portfolio": {
"url": "https://wallet-portfolio.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
curl "https://wallet-portfolio.api.klymax402.com/api/portfolio?address=0x0000000000000000000000000000000000dEaD"
# -> 402 Payment Required, with an x402 payment challenge in the response body
Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
wallet_get_portfolio | GET | /api/portfolio | $0.003 | Get full portfolio with all token balances and USD values |
wallet_get_balance | GET | /api/balance | $0.001 | Get ETH and USDC balance only |
wallet_get_portfolio
Use this when you need to check a crypto wallet's holdings across chains. Returns a full portfolio breakdown in JSON.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
address | string | yes | Wallet address (0x...) |
chain | string | no | Blockchain network (default: base) |
Returns
nativeBalance-- ETH balance with USD valuetokens-- array of ERC-20 tokens with symbol, balance, USD value, contract addresstotalValueUsd-- aggregate portfolio value in USDchain-- which network was queried
Example response:
{"nativeBalance":{"symbol":"ETH","balance":"1.234","valueUsd":3827.50},"tokens":[{"symbol":"USDC","balance":"500.00","valueUsd":500.00}],"totalValueUsd":4327.50,"chain":"base"}
When to use: executing a swap to verify the wallet has sufficient balance. Essential for portfolio tracking, balance checks, and agent self-reporting.
Not for: gas prices (use gas_get_current_price), swap quotes (use dex_get_swap_quote), yield opportunities (use defi_find_best_yields).
wallet_get_balance
Use this when you need a quick check of a wallet's ETH and USDC balance only. Returns a lightweight JSON response -- cheaper than full portfolio.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
address | string | yes | Wallet address (0x...) |
chain | string | no | Blockchain network (default: base) |
Returns
ethBalance-- native ETH balance with USD valueusdcBalance-- USDC balance with USD valuechain-- which network was queried
Example response:
{"ethBalance":{"balance":"2.5","valueUsd":7750.00},"usdcBalance":{"balance":"1000.00","valueUsd":1000.00},"chain":"base"}
When to use: quick pre-trade balance verification when you only care about ETH and USDC. Faster and cheaper than wallet_get_portfolio.
Not for: full portfolio with all tokens (use wallet_get_portfolio), gas prices (use gas_get_current_price).
Example agent prompts
- "Check a crypto wallet's holdings across chains"
- "A quick check of a wallet's ETH and USDC balance only"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT
服务器配置
{
"mcpServers": {
"wallet-portfolio-x402": {
"url": "https://wallet-portfolio-x402-production.up.railway.app/mcp",
"transport": "sse"
}
}
}