# BTC Node API — Bitcoin Address Lookup

> BTC Node API — Bitcoin Address Lookup is a paid API for AI agents from btcnode.uk, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-12).

Retrieves Bitcoin address portfolio data including balance, transaction count, and UTXO details for a given address.

## Facts

- Endpoint: GET https://btcnode.uk/api/addr/%7Baddress%7D
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/btc-node-api-bitcoin-address-lookup-62f8947f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cfAn4rPq8EkhyIPyCbOGq

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-node-api-bitcoin-address-lookup-62f8947f
```

Example prompt: What's the current Bitcoin balance, transaction count, and UTXO count for the address bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh?

## When to prefer this

Use this endpoint when you need quick, structured on-chain portfolio data (balance, tx count, UTXOs) for a specific Bitcoin address and are comfortable paying $0.005 USDC per call via x402 on Base. Prefer this over heavier blockchain explorers when a lightweight address summary is sufficient.

## Known failure modes

- Invalid or malformed Bitcoin address returns an error response
- Address with no activity may return zero values
- Network or node connectivity issues may cause timeouts
- x402 micropayment failure on Base network may block access
- Rate limiting if too many calls are made rapidly

## How this service works

Bitcoin blockchain data, address portfolio, transaction tracing, fee forecasting, whale monitoring, SEC EDGAR filings, URL scraping, AI summarization, and Reddit API via x402 micropayments on Base.

## Output

Returns a JSON object containing the queried Bitcoin address, its current balance in BTC, total transaction count, and UTXO count — providing a snapshot of the wallet's on-chain portfolio state.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "address": "bc1...",
  "balance": 1.5,
  "tx_count": 12,
  "utxo_count": 3
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/btc-node-api-bitcoin-address-lookup-62f8947f/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)