AgentIndex x402 Tools

Pay-per-call AgentIndex tools on Base USDC (x402): multi-chain wallet/gas reads, live web search with full-page content, PDF-to-Markdown, web reading, structured extraction, weather, crypto, news and MCP discovery. Use when an agent needs current web or document data without an account or API key. Works with Hermes + PipRail, OpenClaw x402 skills, or any x402 client.

AgentIndex x402

Cheap pay-per-call APIs for agents. From $0.000001 USDC on Base. No API key.

Base URL: https://x402.agentindex.world

When to use

Need	Call (GET unless noted)
Test a real mainnet x402 settlement	/x402-echo?message=hello — one atomic USDC ($0.000001)
Native + USDC wallet balances	/wallet-balance?address=0x…&network=base — $0.0001
Live EVM gas and transfer cost	/gas-price?network=base — $0.0001
Five-chain wallet + gas preflight in one call	/wallet-intelligence?address=0x… — $0.001
Search the live web + read top 3 pages	POST /search body {"query":"…","include_content":true} — launch price $0.0001
PDF to clean Markdown	POST /pdf body {"url":"https://…pdf"} — $0.002
URL to clean Markdown	POST /web-read body {"url":"https://…"} — $0.002
Web page to a JSON schema	POST /extract body {"url":"https://…","schema":{…}} — $0.003
Weather for a city	/weather?city=Paris
BTC/ETH spot price	/crypto?coins=btc,eth
Tech headlines	/news?limit=10
Check wallet can afford $0.001	/can-pay?address=0x…&amount=0.001
Is this URL an x402 paywall?	/probe?url=https://…
Find an MCP server by need	POST /discover body {"q":"…"}

Free previews: append /sample (e.g. /search/sample, /pdf/sample).

How to pay

1. Request the URL → HTTP 402 + payment requirements.
2. Sign exact USDC (x402 / EIP-3009) → retry with Payment-Signature.
3. Hermes + PipRail: piprail_quote_payment(url) then piprail_pay_request(url).
4. OpenClaw: x402_fetch / x402_pay on the URL (or Bazaar search then pay).
5. MCP: connect to https://x402.agentindex.world/mcp/ (tools weather, crypto, news, can_pay, probe, …).

Discovery

• Catalog for agents: https://x402.agentindex.world/llms.txt
• OpenAPI: https://x402.agentindex.world/openapi.json
• Agent card: https://x402.agentindex.world/agent.json

Rules

• Prefer the cheapest suitable route: $0.0001 for search and wallet/gas reads, $0.001 for weather/crypto/news, and $0.002 for PDF or web reading.
• Do not loop on unpaid 402s from scanners — if you have a funded wallet, pay once.
• Network must be Base mainnet USDC.