# Satoshi API Bitcoin Transaction Explainer

> Satoshi API Bitcoin Transaction Explainer is a paid API for AI agents from cdp.bitcoinsapi.com, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Returns a human-readable AI-generated explanation of a Bitcoin transaction, including fee rate, virtual size, confirmation likelihood, and flow context for a given txid.

## Facts

- Endpoint: GET https://cdp.bitcoinsapi.com/api/v1/ai/explain/transaction/66b3e61d2c9a5e3fb79d3a0dd291efc1864cb7cc4b09c951f6b3d8927c734b59
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cdp-bitcoinsapi-com-6e648880
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8lPpXCeGpfbh2CGKX546t

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 cdp-bitcoinsapi-com-6e648880
```

Example prompt: Can you explain what's going on with Bitcoin transaction 66b3e61d2c9a5e3fb79d3a0dd291efc1864cb7cc4b09c951f6b3d8927c734b59 — things like the fee rate, whether it'll confirm soon, and whether it uses SegWit or Taproot?

## When to prefer this

Choose this endpoint when an AI agent or user needs a plain-language narrative explanation of a specific Bitcoin transaction — not just raw decoded data. Ideal when the goal is human comprehension: understanding fee strategy, confirmation urgency, or transaction type without parsing raw blockchain RPC output. Prefer over raw block explorer APIs when the consumer is a non-technical user, a chat interface, or an agent that needs to communicate transaction status conversationally.

## Known failure modes

- Invalid or malformed txid returns an error or empty explanation
- Txid not found on mainnet returns a not-found error
- Node syncing lag may return stale or incomplete data (check meta.syncing flag)
- Upstream AI provider (Azure OpenAI) unavailable causes explanation generation failure
- Rate limiting or payment failure at x402 layer blocks access

## How this service works

Satoshi API transaction explainer: human-readable txid fee, confirmation, and flow context for AI agents.

## Output

A JSON object containing the txid, the provider name (e.g. 'azure_openai'), and a plain-language explanation covering the transaction's virtual size in vB, fee rate in sat/vB compared to current typical rates, expected confirmation timing, transaction type (SegWit/Taproot/legacy), and any notable features like inscriptions. Also includes chain metadata such as node height, cache age, and timestamp.

## Example request

```json
{
 "input": {
  "queryParams": {}
 }
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "input": {
  "type": "http",
  "method": "GET",
  "resource": "https://cdp.bitcoinsapi.com/api/v1/ai/explain/transaction/66b3e61d2c9a5e3fb79d3a0dd291efc1864cb7cc4b09c951f6b3d8927c734b59",
  "queryParams": {}
 },
 "output": {
  "type": "json",
  "schema": {
   "type": "object",
   "required": [
    "txid",
    "explanation"
   ],
   "properties": {
    "txid": {
     "type": "string"
    },
    "provider": {
     "type": "string"
    },
    "explanation": {
     "type": "string"
    }
   }
  },
  "example": {
   "txid": "66b3e61d2c9a5e3fb79d3a0dd291efc1864cb7cc4b09c951f6b3d8927c734b59",
   "provider": "satoshi-api",
   "explanation": "This transaction pays a moderate fee and is likely to confirm when the next block has room."
  },
  "mimeType": "application/json"
 },
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "mimeType",
    "example"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "schema": {
     "type": "object"
    },
    "example": {
     "type": "object"
    },
    "mimeType": {
     "type": "string"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "data",
  "meta"
 ],
 "properties": {
  "data": {
   "type": "object",
   "required": [
    "txid",
    "provider",
    "explanation"
   ],
   "properties": {
    "txid": {
     "type": "string"
    },
    "provider": {
     "type": "string"
    },
    "explanation": {
     "type": "string"
    }
   }
  },
  "meta": {
   "type": "object",
   "required": [
    "chain",
    "cached",
    "syncing",
    "timestamp",
    "max_blocks",
    "request_id",
    "node_height",
    "cache_age_seconds"
   ],
   "properties": {
    "chain": {
     "type": "string"
    },
    "cached": {
     "type": "boolean"
    },
    "syncing": {
     "type": "boolean"
    },
    "timestamp": {
     "type": "string"
    },
    "max_blocks": {
     "type": "null"
    },
    "request_id": {
     "type": "null"
    },
    "node_height": {
     "type": "number"
    },
    "cache_age_seconds": {
     "type": "number"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cdp-bitcoinsapi-com-6e648880/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cdp.bitcoinsapi.com](https://www.zero.xyz/host/cdp.bitcoinsapi.com/llms.txt)