# BTC Address Surveillance — Mempool Scan, Balance & Risk Score

> BTC Address Surveillance — Mempool Scan, Balance & Risk Score is a paid API for AI agents from btcnode.uk, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Scans the Bitcoin mempool and blockchain for a given address, returning 24h activity, balance, incoming/outgoing transaction counts, and coinjoin detection with a risk score.

## Facts

- Endpoint: GET https://btcnode.uk/api/agent/address/:address
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/btc-address-surveillance-mempool-scan-balance-risk-score-1bc43caf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f_0LiiO7tg9KSIqpki97_

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 btc-address-surveillance-mempool-scan-balance-risk-score-1bc43caf
```

Example prompt: Can you run a full mempool scan and risk check on the Bitcoin address bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh — I want to see the balance, last 24h activity, incoming and outgoing counts, any coinjoin detection, and the risk score?

## When to prefer this

Use this endpoint when you need a comprehensive, single-call surveillance snapshot of a Bitcoin address including real-time mempool data, risk scoring, and coinjoin detection — rather than a plain balance or UTXO lookup. Prefer this over the basic portfolio endpoint when compliance screening, fraud detection, or AML risk assessment is the goal.

## Known failure modes

- Invalid or malformed Bitcoin address returns a 400 error
- Address with no on-chain history may return empty activity fields
- Mempool node temporarily unavailable returns 503
- Rate limiting or payment failure returns 402

## How this service works

BTC Address Surveillance — mempool scan, balance, risk score. Returns last 24h activity, incoming/outgoing counts, coinjoin detection.

## Output

Returns a JSON object containing the address balance, a risk score (0–100), a summary of transaction activity in the last 24 hours, counts of incoming and outgoing transactions, and whether coinjoin mixing has been detected on the address.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/btc-address-surveillance-mempool-scan-balance-risk-score-1bc43caf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from btcnode.uk](https://www.zero.xyz/host/btcnode.uk/llms.txt)