# SignalHarness EVM Transaction Receipt Match

> SignalHarness EVM Transaction Receipt Match is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).

Matches and validates an EVM transaction receipt against caller-supplied criteria, returning a structured match result with evidence and warnings.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/evm_transaction_receipt_match/invoke
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-evm-transaction-receipt-match-6240ae3c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KhZN0qD-jWxiV9xzB5M-i

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 signalharness-evm-transaction-receipt-match-6240ae3c -d '<json body>'
```

Example prompt: Can you verify that this EVM transaction receipt matches what was expected — I'll give you the receipt details and criteria, and I need to know if it's a match, any warnings, and the result hash.

## When to prefer this

Choose this endpoint when you need a structured, auditable match result for an EVM transaction receipt — particularly on Base network — with evidence scoping and SHA-256 result hashing for downstream verification. Prefer it over raw on-chain lookups when you need a standardized match/no-match verdict with warnings and a verifiable receipt artifact in a single paid API call.

## Known failure modes

- Malformed or invalid transaction receipt match request string returns validation error
- Receipt data that doesn't parse as valid EVM transaction data may produce warnings rather than a hard error
- Replay attacks detected and flagged via the replay boolean field
- Network or service downtime may cause execution failures with status other than 'succeeded'
- Oversized input exceeding 65536 characters will be rejected

## How this service works

Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.

## Output

Returns a JSON object containing: a boolean replay flag, a result object with the match status string, any warnings, service ID, and evidence scope, plus a full service receipt with payment details, network (e.g. eip155:8453 for Base), amounts, timing, a SHA-256 result hash, and execution metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "transaction_receipt_match_request": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "A matching pair is not proof that either record came from a chain."
   ],
   "service_id": "evm_transaction_receipt_match",
   "evidence_scope": "caller_supplied_data",
   "transaction_receipt_match": "{\"checks\":{\"block_hash\":true,\"block_number\":true,\"transaction_hash\":true},\"matches\":true}"
  },
  "status": "succeeded",
  "receipt": {
   "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   "usage": [],
   "status": "succeeded",
   "network": "eip155:8453",
   "artifacts": [],
   "endedAtMs": 0,
   "latencyMs": 0,
   "paymentId": "example-payment",
   "receiptId": "example-receipt",
   "requestId": "example-request",
   "serviceId": "evm_transaction_receipt_match",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "5000",
   "resultSha256": "a9bc3d9e46f8aa4640effde9f67bde5ef75dd01b6c7bd381e83b739ea75cd49a",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signalharness-evm-transaction-receipt-match-6240ae3c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)