# SignalHarness Bitcoin TXID Compute

> SignalHarness Bitcoin TXID Compute is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Extracts or computes Bitcoin transaction IDs (TXIDs) from caller-supplied text or data

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/bitcoin_txid_compute/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-bitcoin-txid-compute-b0a55e70
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DXg1_h9LFl-anrSLEELsd

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-bitcoin-txid-compute-b0a55e70 -d '<json body>'
```

Example prompt: Can you extract all the Bitcoin transaction IDs from this text I got from a payment confirmation email: 'Your payment of 0.005 BTC was sent, txid: 4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b'?

## When to prefer this

Choose this endpoint when you need to programmatically extract or identify Bitcoin transaction IDs from unstructured or semi-structured text, logs, messages, or documents. It is well-suited for agents automating Bitcoin payment verification workflows, customer support pipelines handling crypto payments, or any scenario where TXIDs need to be pulled from caller-supplied data without manual parsing. Prefer this over a generic blockchain explorer API when the TXID itself is not yet known and must first be located within raw text.

## Known failure modes

- No Bitcoin TXID found in input — returns empty or null bitcoin_transaction_ids with a warning
- Input text too short (minLength:2) or too long (maxLength:65536) — validation error
- Malformed or ambiguous input that cannot be parsed — may return warnings with partial results
- Payment failure via x402 protocol — service not invoked, no result returned
- Network or execution failure — status field returns non-succeeded value

## How this service works

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## Output

Returns a JSON object containing extracted bitcoin_transaction_ids (one or more TXIDs found in the input), any warnings generated during processing, the evidence_scope indicating the data was caller-supplied, and a full receipt with payment details, latency metrics, and a SHA-256 result hash for auditability.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Identifiers do not prove broadcast, inclusion, or validity."
   ],
   "service_id": "bitcoin_txid_compute",
   "evidence_scope": "caller_supplied_data",
   "bitcoin_transaction_ids": "{\"identifiers_equal\":true,\"segwit\":false,\"txid\":\"cdb9f8dfefadc40b90a8eb090bcadc4d9a83ad5fbe38645e3e9b2fa234f032de\",\"wtxid\":\"cdb9f8dfefadc40b90a8eb090bcadc4d9a83ad5fbe38645e3e9b2fa234f032de\"}"
  },
  "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": "bitcoin_txid_compute",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "7cf3d17131bb08d31df60d815b602a1ee312dcf848bc72b6ae96499a79e0c18d",
   "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-bitcoin-txid-compute-b0a55e70/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)