# witness.holoweave.org Transaction Finality Verification

> witness.holoweave.org Transaction Finality Verification is a paid API for AI agents from witness.holoweave.org, paid per call via x402, $0.05/call, status down (last checked 2026-09-15).

Verifies finality and transfer details of Base blockchain transactions by tx hash or x402 payment-response header, returning a signed attestation with pass/fail verdict

## Facts

- Endpoint: POST https://witness.holoweave.org/v1/txs-finality
- Price: $0.05/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/witness-holoweave-org-transaction-finality-verification-3cefe2e6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eLGX2bjgDL3VvZSGBxYav

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability witness-holoweave-org-transaction-finality-verification-3cefe2e6 -d '<json body>'
```

Example prompt: Can you verify that transaction 0x1785abc... on Base (eip155:8453) actually finalized and transferred 0.05 USDC to 0x9975...? I need a signed attestation confirming the settlement.

## When to prefer this

Use this endpoint when you need an independent, cryptographically signed third-party attestation that a Base blockchain transaction reached finality and carried the expected USDC transfer — particularly for x402 payment verification workflows where you need tamper-evident proof beyond just reading on-chain data yourself. Prefer it over raw RPC calls when auditability, non-repudiation, or dispute resolution require a signed witness receipt.

## Known failure modes

- Transaction not yet finalized — verdict may be 'indeterminate' or pending
- Transaction hash not found on the specified chain — returned as 'unreachable'
- Unexpected transfer amount or recipient — verdict 'fail' when expect constraints not met
- Invalid chain ID provided — defaults to eip155:8453 if omitted
- Malformed payment_response header — may result in parse error or fail verdict
- Exceeding 10 items per batch — rejected by input schema validation
- Payment not made ($0.05 USDC required) — x402 payment required response

## 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 (with key_id and base64 signature) containing a verdict of 'pass' or 'fail' for each transaction, including finality status, block number, whether the transaction succeeded, detected USDC transfers (from/to/amount/symbol), and a summary of pass/fail counts across all checked items.

## Response schema (JSON Schema)

```json
{
 "example": {
  "signature": {
   "alg": "ed25519",
   "value": "base64...",
   "key_id": "aw-attest-2026-08"
  },
  "attestation": {
   "verdict": "pass",
   "endpoint": "txs-finality",
   "evidence": {
    "count": 2,
    "items": [
     {
      "chain": "eip155:8453",
      "found": true,
      "index": 0,
      "tx_hash": "0x1785…",
      "verdict": "pass",
      "finality": "finalized",
      "findings": [],
      "succeeded": true,
      "transfers": [
       {
        "to": "0x9975…",
        "from": "0x423d…",
        "amount": "0.010000",
        "symbol": "USDC"
       }
      ],
      "block_number": 50484884
     }
    ],
    "summary": {
     "fail": 0,
     "pass": 2,
     "changed": [],
     "unreachable": [],
     "indeterminate": 0
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/witness-holoweave-org-transaction-finality-verification-3cefe2e6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from witness.holoweave.org](https://www.zero.xyz/host/witness.holoweave.org/llms.txt)