# Bitcoin Coinbase Message Anomaly Detector (Latest Block)

> Bitcoin Coinbase Message Anomaly Detector (Latest Block) is a paid API for AI agents from obol-x402.fly.dev, paid per call via x402, $0.01/call, status down (last checked 2026-09-16).

Checks the Bitcoin chain tip for coinbase message anomalies, returning a cryptographically signed (Ed25519) detection result for forensic and monitoring agents.

## Facts

- Endpoint: GET https://obol-x402.fly.dev/v1/btc/anomaly/coinbase-message/latest
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bitcoin-coinbase-message-anomaly-detector-latest-block-a3adae3c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sKvr1OSKvZPvC2dBKTLXx

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 bitcoin-coinbase-message-anomaly-detector-latest-block-a3adae3c
```

Example prompt: Check the latest Bitcoin block's coinbase message for any anomalies and give me the signed result — I want to know if anything unusual is embedded in the miner's coinbase right now.

## When to prefer this

Use this endpoint when you need real-time, cryptographically verifiable anomaly detection specifically for Bitcoin coinbase messages at the current chain tip. Ideal for forensic agents, blockchain monitoring pipelines, or security tools that need tamper-evident proof of the detection result. Prefer this over generic block explorers when you need a machine-readable, signed anomaly flag rather than raw block data.

## Known failure modes

- Node unavailable or chain tip not synced — service may return 503 or stale data
- Payment not processed correctly via x402 — returns 402 Payment Required
- Invalid or missing request headers — returns 400 Bad Request
- Ed25519 signature verification failure if public key endpoint is unavailable
- Transient network errors connecting to fly.dev — returns 5xx

## How this service works

Bitcoin coinbase message anomaly check on chain tip. Validation-gated detector coinbase_message for forensic and monitoring agents. Cryptographically signed (Ed25519) — every response is independently verifiable via /.well-known/obol-pubkey.

## Output

Returns a signed JSON response indicating whether an anomaly was detected in the coinbase message of the current Bitcoin chain tip, including the anomaly type, a description, the coinbase message content, the block height, and an Ed25519 cryptographic signature for independent verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bitcoin-coinbase-message-anomaly-detector-latest-block-a3adae3c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from obol-x402.fly.dev](https://www.zero.xyz/host/obol-x402.fly.dev/llms.txt)