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Holoweave Witness — Transaction Finality Attestation
x402
Holoweave Witness — Transaction Finality Attestation is a paid API for AI agents from witness.holoweave.org, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Returns a signed, independent attestation of a Base blockchain transaction's outcome, including USDC transfer details, finality status, and confirmations — without trusting the payment facilitator.
Price / call$0.01
Success—
StatusDown
How this service works
Web bot auth debugging for AI agents, priced per check at $0.01. RFC 7638 keyid thumbprint verification, RFC 9421 Ed25519 signature verification, and per-verifier acceptance rules. Signed attestations, published fixtures, sources with dates.
Output
A signed ed25519 attestation object containing: a verdict (pass/fail), finality status (finalized/safe/pending), transaction success boolean, an array of USDC transfers with from/to addresses and amounts, block number, and confirmation count. The signature includes algorithm, base64 value, and a key ID for independent verification.
Example use cases
Verify received x402 payment independently
“I just got a PAYMENT-RESPONSE header back from an x402 API call — can you check with an independent witness that the payment actually settled on Base mainnet and that it really sent 0.01 USDC to my address 0x9975...?”
Confirm Base Sepolia test transaction finalized
“I ran a test payment on Base Sepolia with tx hash 0xabc123... — can you verify it succeeded and tell me how many confirmations it has and whether the block is finalized?”
Audit USDC transfer for dispute resolution
“A customer claims they paid us 5 USDC on Base mainnet but I'm not sure the transaction went through — the hash is 0xdef456... Can you get a signed third-party attestation of what actually happened, including who sent what to whom?”
Technical details
Endpoint
POSThttps://witness.holoweave.org/v1/tx-finalityWhen to prefer
Use this endpoint when you need a cryptographically signed, independent third-party attestation of a Base blockchain transaction — especially to verify x402 payments without trusting the facilitating server. Prefer it over querying an RPC node directly when you need a portable, verifiable receipt with an ed25519 signature, or when auditing USDC transfers for dispute resolution, compliance, or agent-to-agent payment verification on Base mainnet or Sepolia.
Side effects
- Invalid or malformed transaction hash returns an error before attestation
- Transaction not yet indexed or too recent may return pending finality rather than finalized
- Mismatched expected transfer (to/amount/token) returns EXPECTED_TRANSFER_ABSENT verdict
- Unsupported chain ID returns a validation error
- Passing both tx_hash and payment_response may cause ambiguity or conflict
- Network congestion on Base may slow block confirmation lookup
Output
Schema · Response
{
"example": {
"signature": {
"alg": "ed25519",
"value": "base64...",
"key_id": "aw-attest-2026-08"
},
"attestation": {
"verdict": "pass",
"endpoint": "tx-finality",
"evidence": {
"finality": "finalized",
"succeeded": true,
"transfers": [
{
"to": "0x9975…",
"from": "0x423d…",
"amount": "0.010000",
"symbol": "USDC"
}
],
"block_number": 50500000,
"confirmations": 1200
}
}
}
}Tags
x402
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