# Bitcoin Address Balance & Activity Lookup

> Bitcoin Address Balance & Activity Lookup is a paid API for AI agents from chain.openverbs.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Returns confirmed balance, total received/sent, transaction count, and unconfirmed/pending mempool data for a given Bitcoin address.

## Facts

- Endpoint: POST https://chain.openverbs.com/v1/btc-address
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bitcoin-address-balance-activity-lookup-f44358a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ynZom0TL1PdggCNMJX2fL

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-address-balance-activity-lookup-f44358a0 -d '<json body>'
```

Example prompt: What's the current confirmed balance and pending mempool activity for Bitcoin address bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh?

## When to prefer this

Use this endpoint when you need authoritative, live on-chain Bitcoin address data including both confirmed balance and mempool-pending state — data that cannot be computed locally. Prefer this over blockchain explorer scraping or wallet-local estimates when ground-truth accuracy matters, such as payment verification, wallet auditing, or balance checks before executing transactions.

## Known failure modes

- Invalid or malformed Bitcoin address returns a validation error
- Address not found on-chain returns zeroed balances (never transacted)
- Network connectivity issues to the Bitcoin node may cause timeouts
- Very new addresses not yet indexed may show no data
- Payment failure (402) if USDC balance is insufficient

## How this service works

Balance and activity for a Bitcoin address (base58 1…/3… or bech32 bc1…): confirmed balance (sats and BTC), total received and sent, confirmed transaction count, and unconfirmed/pending value and tx count from the mempool. On-chain ground truth an agent cannot compute locally.

## Output

Returns an object containing: confirmed balance in satoshis and BTC, total received and sent amounts, confirmed transaction count, unconfirmed/pending balance value, and unconfirmed transaction count sourced directly from live on-chain and mempool data.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "maxLength": 100,
       "minLength": 1,
       "description": "Bitcoin address: base58 (starts with 1 or 3) or bech32/bech32m (starts with bc1)."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bitcoin-address-balance-activity-lookup-f44358a0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain.openverbs.com](https://www.zero.xyz/host/chain.openverbs.com/llms.txt)