# SignalHarness EVM Receipt Summarizer

> SignalHarness EVM Receipt Summarizer is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-16).

Accepts a raw EVM transaction receipt (as text) and returns a human-readable summary with warnings and evidence scope metadata.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/evm_receipt_summary/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-evm-receipt-summarizer-b611c64b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EaZof7-q9jT3CTSJk_jgD

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-receipt-summarizer-b611c64b -d '<json body>'
```

Example prompt: Can you summarize this EVM transaction receipt for me and flag anything unusual? Here's the raw receipt data: {paste raw receipt JSON or text here}.

## When to prefer this

Choose this endpoint when you need a fast, agent-native plain-English interpretation of an EVM transaction receipt — especially on Base/EIP-155 chains — and want structured output including warnings and evidence scope. Prefer it over generic LLM prompting when you need a consistent schema, pay-per-call pricing at $0.01, and an auditable receipt of the analysis itself.

## Known failure modes

- Malformed or non-EVM receipt text results in parsing errors or low-confidence summaries
- Receipt text exceeding 65,536 characters is rejected
- Ambiguous or incomplete receipt data may produce warnings but still return a partial summary
- Payment not confirmed may result in HTTP 402 before processing begins

## 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 plain-language receipt_summary string, a list of warnings (e.g. anomalies or data quality issues), an evidence_scope string indicating the source of analyzed data, a replay flag, and a standard receipt envelope with payment metadata including asset, network, amounts, timing, and a SHA-256 hash of the result.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Supplied receipt fields are not proof of finality."
   ],
   "service_id": "evm_receipt_summary",
   "evidence_scope": "caller_supplied_data",
   "receipt_summary": "{\"block_hash\":\"0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb\",\"block_number\":\"100\",\"contract_address\":null,\"effective_gas_price\":\"100\",\"gas_used\":\"21000\",\"log_count\":0,\"removed_log_count\":0,\"status\":\"success\",\"transaction_hash\":\"0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"}"
  },
  "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_receipt_summary",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "22e8d12c93be2f0d8c46a2d55898dd8689a015e82a349d09fa8b937606f67750",
   "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-receipt-summarizer-b611c64b/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)