# Beggar Bot BTC Outspends Lookup (Base mainnet)

> Beggar Bot BTC Outspends Lookup (Base mainnet) is a paid API for AI agents from beggar-bot-demand.beggarbot.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-04).

Fetches Bitcoin transaction outspend data for a given transaction or output via the Beggar Bot utility service on Base mainnet

## Facts

- Endpoint: GET https://beggar-bot-demand.beggarbot.workers.dev/v1/btcoutspends?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-04
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/beggar-bot-btc-outspends-lookup-base-mainnet-fa238ed6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_05QKGttpxGPAMojS-SzEr

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 beggar-bot-btc-outspends-lookup-base-mainnet-fa238ed6
```

Example prompt: Can you check whether the outputs of Bitcoin transaction a1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d have been spent and show me the spending transaction details?

## When to prefer this

Use this endpoint when you need to verify Bitcoin UTXO spend status or trace the spending transaction for a specific Bitcoin output, particularly when already using the Beggar Bot suite of blockchain utilities and paying via x402 on Base mainnet with USDC.

## Known failure modes

- Invalid or malformed Bitcoin transaction ID returns an error response
- Transaction ID not found on Bitcoin mainnet returns a not-found error
- Missing required transaction ID parameter returns a 400 bad request
- Payment not completed via x402 returns a 402 Payment Required response
- Network congestion or worker timeout may return a 503 or timeout error

## How this service works

Paid: /v1/verify, /v1/risk, /v1/receipt cost $0.01 USDC per call on Base mainnet via x402 (payTo 0x719227f384b66BFEF00093D6d8d32fA9dC2B40e7); utilities analyze Base mainnet (USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) by default, network=base-sepolia optional; /v1/receipt/verify and discovery files are free. Operator: Beggar Bot.

## Output

Returns JSON with outspend information for the queried Bitcoin transaction outputs, including whether each output has been spent, the spending transaction ID, and input index details if applicable.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/beggar-bot-btc-outspends-lookup-base-mainnet-fa238ed6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from beggar-bot-demand.beggarbot.workers.dev](https://www.zero.xyz/host/beggar-bot-demand.beggarbot.workers.dev/llms.txt)