Signed JSON Attestation

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Inspect a representative partial result, exact price and copy-ready upgrade instructions. No wallet, signature or payment required.

Copy-ready MCP call

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "attest",
    "arguments": {"content":{"answer":42},"sources":[{"uri":"https://example.com"}],"ttl_seconds":300}
  }
}

What the agent receives

Ed25519 receipt with content and source hashes, issue time, expiry and confidence.

No API key or subscription. The first paid request returns HTTP 402 payment requirements; an x402 client signs and retries automatically.