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MERCURY x402 Web Extraction with Micropayment
x402
MERCURY x402 Web Extraction with Micropayment is a paid API for AI agents from mercury-x402-jed.fly.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).
Fetches and extracts structured data from a URL using HTTP 402 micropayment in USDC on Base mainnet, returning content with a cryptographic attestation
Price / call$0.004
Success—
StatusUnknown
How this service works
MERCURY is an agent-to-agent storefront that sells over HTTP 402. Your agent discovers what's for sale, pays with its own wallet on Base mainnet in real USDC, and gets the goods — in about 5 lines. Early · Base mainnet · real USDC · no token · built solo.
Output
A JSON object containing: whether the fetch succeeded (ok), the requested URL, page title, the extracted structured fields matching the provided schema, HTTP status code, whether the response was truncated, content type, and a full EIP-191 cryptographic attestation including signer address, signature, nonce, fetch timestamp, and SHA-256 content hash for verification.
Example use cases
Example prompt
“Can you fetch https://example.com/product/42 for me, extract the price, title, and inStock fields, and pay for the request using my Base wallet — I want back the structured data along with the cryptographic attestation proving you actually fetched it.”
Technical details
Endpoint
GEThttps://mercury-x402-jed.fly.dev/buy/extractWhen to prefer
Choose this endpoint when your AI agent needs to fetch and extract structured data from a live URL and requires a cryptographic attestation proving the fetch occurred — ideal for agent-to-agent commerce scenarios where verifiability matters, or when you want pay-per-use web extraction billed at $0.004 USDC per call on Base mainnet without a subscription or API key.
Side effects
- Insufficient USDC balance in agent wallet — payment rejected before fetch occurs
- Invalid or unreachable URL — returns error status from target site
- Target site blocks automated fetching — may return 403 or empty content
- Schema fields not found on page — extracted values return null
- Attestation verification failure if signer key rotated — check /.well-known/mercury-attestation for current key
- Service downtime on Fly.dev infrastructure — 502 or connection error
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"url": "https://example.com/",
"title": "Example Domain",
"schema": {
"price": "number",
"title": "string",
"inStock": "boolean"
},
"status": 200,
"extract": {
"price": null,
"title": "Example Domain",
"inStock": null
},
"truncated": false,
"attestation": {
"alg": "EIP-191-personal_sign",
"keyId": "mercury-x402-attestation-v1:0x<signer>",
"nonce": "0x<16-random-bytes>",
"verify": {
"howTo": "EIP-191 ecrecover this message; signer must equal address. Recompute sha256(text+extract)==contentHash.",
"message": "mercury-x402:fetch-attestation:v1\nurl=https://example.com/\nstatus=200\nsha256=0x…\nfetchedAt=2026-06-03T00:00:00.000Z\nnonce=0x…"
},
"address": "0x<signer-from-/.well-known/mercury-attestation>",
"signedAt": "2026-06-03T00:00:00.000Z",
"signature": "0x<65-byte EIP-191 signature>",
"contentHash": "0x<sha256 of text+extract>"
},
"contentType": "text/html; charset=utf-8"
}
}Tags
x402
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