# SignalHarness Bitcoin Merkle Proof Verifier

> SignalHarness Bitcoin Merkle Proof Verifier is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Verifies a Bitcoin Merkle proof to confirm that a transaction is included in a Bitcoin block

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/bitcoin_merkle_proof_verify/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-bitcoin-merkle-proof-verifier-5fc3bb41
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HODrFtdDWMnplBsxEWLxi

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-merkle-proof-verifier-5fc3bb41 -d '<json body>'
```

Example prompt: Can you verify this Bitcoin Merkle proof for me to confirm the transaction is genuinely included in the block? Here's the proof data: {bitcoin_merkle_request}.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-use cryptographic verification of Bitcoin Merkle proofs without running a full Bitcoin node. It is ideal for agents handling SPV (Simplified Payment Verification) scenarios, e-commerce payment confirmation, compliance auditing of BTC transactions, or any workflow where trustless Bitcoin inclusion proof validation is required for a low cost ($0.01 USDC per call).

## Known failure modes

- Malformed or invalid Merkle proof input causes verification failure
- Proof data exceeds the 65536 character limit and is rejected
- Caller-supplied data does not correspond to a real Bitcoin block or transaction, resulting in a failed verification with warnings
- Payment not processed (x402 flow not completed), blocking invocation
- Network or service unavailability returns a non-success status

## 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 with a 'status' field ('succeeded' or otherwise), a 'result' object containing the 'bitcoin_merkle_verification' outcome, any 'warnings', and an 'evidence_scope' indicating that the verification is based on caller-supplied data. Also includes a 'receipt' with payment details, request/execution IDs, and a SHA-256 hash of the result for auditability.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Proof validity does not prove the header belongs to the best chain."
   ],
   "service_id": "bitcoin_merkle_proof_verify",
   "evidence_scope": "caller_supplied_data",
   "bitcoin_merkle_verification": "{\"computed_merkle_root\":\"1111111111111111111111111111111111111111111111111111111111111111\",\"expected_merkle_root\":\"1111111111111111111111111111111111111111111111111111111111111111\",\"valid\":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": "bitcoin_merkle_proof_verify",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "072bf1282b866794b61c7dbbe51c5ef145bb5773b6580868b41366bae8df28a2",
   "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-merkle-proof-verifier-5fc3bb41/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)