# SignalHarness Bitcoin PSBT Inspector

> SignalHarness Bitcoin PSBT Inspector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-16).

Inspects and analyzes a Bitcoin Partially Signed Bitcoin Transaction (PSBT), returning decoded details, warnings, and evidence scope about the transaction structure.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/bitcoin_psbt_inspect/invoke
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-bitcoin-psbt-inspector-685237a6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MUJnV8uGwVGlWC9T_ulVO

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-psbt-inspector-685237a6 -d '<json body>'
```

Example prompt: Can you inspect this Bitcoin PSBT for me and tell me if there are any warnings or anything suspicious before I sign it? Here's the raw PSBT: cHNidP8BAH...

## When to prefer this

Choose this endpoint when you need a quick, agent-native, micropayment-gated PSBT inspection without spinning up a local Bitcoin node or library. Ideal for AI agents that need to analyze user-supplied PSBTs on-the-fly at $0.015 per call, especially when building autonomous Bitcoin transaction review workflows or wallet UIs that need serverless PSBT decoding.

## Known failure modes

- Invalid or malformed PSBT string returns an error or empty inspection
- PSBT exceeds 65536 character max length — request rejected
- Malformed base64 encoding causes parse failure
- Payment not completed results in 402 response before execution
- Network or service unavailability returns a non-200 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 containing an inspection result with warnings array, evidence scope label, and a decoded bitcoin_psbt_inspection summary, along with a receipt including payment ID, network, amount, latency, and result hash for auditability.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Inspection does not finalize, sign, or prove PSBT validity."
   ],
   "service_id": "bitcoin_psbt_inspect",
   "evidence_scope": "caller_supplied_data",
   "bitcoin_psbt_inspection": "{\"global_entry_count\":0,\"map_count\":1,\"maps\":[{\"entry_count\":0,\"index\":0,\"key_types\":[]}],\"psbt_version\":\"v0_or_unspecified\"}"
  },
  "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_psbt_inspect",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "15000",
   "resultSha256": "2a455233c335cabd7f9db8d53e2a9992f54ad458b4691fc2f3085547184ac3ef",
   "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-psbt-inspector-685237a6/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)