# SiteCheck BTC Address Lookup

> SiteCheck BTC Address Lookup is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).

Looks up a Bitcoin mainnet address to return its confirmed/unconfirmed balance in BTC and USD, total sent/received, transaction count, current BTC/USD price, and recent transactions.

## Facts

- Endpoint: GET https://api.sitecheck-api.workers.dev/api/btc/address?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-btc-address-lookup-d3e87e06
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jmXj_YYzOdtRCho3SWzei

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 sitecheck-btc-address-lookup-d3e87e06
```

Example prompt: Can you check the Bitcoin balance and recent transactions for address bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh and tell me the current confirmed BTC balance in both BTC and USD?

## When to prefer this

Choose this endpoint when you need on-chain Bitcoin address data including balance in both BTC and USD, historical send/receive totals, and recent transaction details — all in one call. It is backed by mempool.space and also returns the live BTC/USD price, making it more convenient than raw block explorer APIs. Prefer it over Solana or EVM wallet endpoints for Bitcoin-specific lookups.

## Known failure modes

- Invalid or malformed Bitcoin address returns an error
- Address not found on mainnet returns empty data
- Rate limiting or payment failure returns 402
- mempool.space upstream outage may cause timeout or partial data
- Unconfirmed transactions may have 0 balance if mempool is not synced

## How this service works

A Bitcoin mainnet address: confirmed and unconfirmed balance in BTC and USD, transaction count, funded and spent totals, and its last 10 transactions with the net change for the address. Mainnet bech32 and legacy addresses only. Source: mempool.space. Information only, not financial advice.

## Output

Returns a JSON object with the queried Bitcoin address, its confirmed and unconfirmed balances in BTC, USD, and satoshis, total BTC received and sent, total transaction count, the current BTC/USD spot price, a timestamp, and an array of recent transactions each with txid, net BTC change, timestamp, and confirmation status.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "Bitcoin mainnet address (bc1…, 1… or 3…)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "btcUsd": 83345.495,
  "source": "https://mempool.space/api/address/bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh, https://mempool.space/api/address/bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh/txs",
  "totals": {
   "sentBtc": 12.87005839,
   "txCount": 1143,
   "receivedBtc": 16.79658727
  },
  "address": "bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh",
  "balance": {
   "confirmed": {
    "btc": 3.92652888,
    "usd": 327258.49,
    "sats": 392652888
   },
   "unconfirmed": {
    "btc": 0,
    "usd": 0,
    "sats": 0
   }
  },
  "checkedAt": "2026-10-14T07:00:19.888Z",
  "disclaimer": "Information only, not financial advice.",
  "recentTransactions": [
   {
    "time": "2026-10-13T22:38:17.000Z",
    "txid": "69d90ee94f7a671dcf653749a5b36b6aa56f27ead6440950184e5efc1a9b4353",
    "netBtc": 0.00007093,
    "confirmed": true
   },
   {
    "time": "2026-10-13T13:21:16.000Z",
    "txid": "e9736079eb52ec7a7bbe517c06b773d4e48b48c1423bec94ce48817febb0f3cd",
    "netBtc": 0.0002,
    "confirmed": true
   },
   {
    "time": "2026-10-13T10:21:33.000Z",
    "txid": "c59a232a0077bf282fa0fc335ebeb1c3aa1ad5b48b32139832df6047f303ff0b",
    "netBtc": 0.00011038,
    "confirmed": true
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-btc-address-lookup-d3e87e06/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sitecheck-api.workers.dev](https://www.zero.xyz/host/api.sitecheck-api.workers.dev/llms.txt)