# cairnworks verify — batch on-chain receipt verification

> cairnworks verify — batch on-chain receipt verification is a paid API for AI agents from cairnworks-verify.run402.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-28).

Batch-verifies up to 10 Base or BSC transaction receipts in a single signed, sha256-evidenced JSON response, paid via x402 USDC on Base.

## Facts

- Endpoint: POST https://cairnworks-verify.run402.com/batch-verify?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cairnworks-verify-batch-on-chain-receipt-verification-29fa4fa0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QVzTyBEY2Z6DjUEuarLMF

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 cairnworks-verify-batch-on-chain-receipt-verification-29fa4fa0 -d '<json body>'
```

Example prompt: Can you batch-verify these 3 transaction hashes on Base for me — 0xabc...001, 0xabc...002, and 0xabc...003 — and tell me which ones succeeded, which reverted, and give me the combined evidence digest?

## When to prefer this

Choose this endpoint when you need to verify multiple (2–10) on-chain transaction receipts in a single atomic call with a combined sha256 evidence digest, rather than making separate single-tx calls. Ideal for agent payout reconciliation, batch disbursement audits, and scenarios where you need a single signed, tamper-evident proof across many transactions. Requires no API key or account — only a one-time x402 USDC payment on Base.

## Known failure modes

- Invalid tx hash format (not matching 0x[64 hex chars]) returns validation error
- Unsupported chain value returns enum mismatch error
- More than 10 tx hashes in array returns maxItems validation error
- Transaction hash not found on specified chain returns missing status in summary
- Network or RPC timeout may cause partial results with error count incremented
- Payment not received or x402 payment failure blocks the request entirely

## How this service works

cairnworks verify — fixed-price x402 (USDC on Base) checks for agent payouts: verify a Base/BSC transaction receipt and ERC-20 transfers (0.01), audit a URL's status/redirects/paywall flags (0.01), token holder and treasury share audit at a block (0.02), batch-verify up to 10 payout receipts (0.02). No account, no API key; every response is signed JSON with a sha256 evidence digest. Free sample outputs at /samples (no payment).

## Output

A signed JSON object containing: batch kind label, chain name, chain ID, total count requested, a summary object (found, missing, reverted, error, success counts), per-transaction statuses, an individual evidence SHA256 digest, and a combined_evidence_sha256 across all receipts. No API key required; response is cryptographically signed by cairnworks.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "enum": [
    "base",
    "base-sepolia",
    "bsc"
   ],
   "type": "string"
  },
  "txHashes": {
   "type": "array",
   "items": {
    "type": "string",
    "pattern": "^0x[0-9a-fA-F]{64}$"
   },
   "maxItems": 10,
   "minItems": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "kind": "batch_verify",
  "chain": "base",
  "count": 1,
  "summary": {
   "found": 1,
   "errors": 0,
   "missing": 0,
   "success": 1,
   "reverted": 0,
   "requested": 1
  },
  "chain_id": 8453,
  "evidence_sha256": "…",
  "combined_evidence_sha256": "…"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cairnworks-verify-batch-on-chain-receipt-verification-29fa4fa0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cairnworks-verify.run402.com](https://www.zero.xyz/host/cairnworks-verify.run402.com/llms.txt)