# BTC Mempool Data via x402 Micropayment

> BTC Mempool Data via x402 Micropayment is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-31).

Returns Bitcoin mempool data (transactions, fees, or related metrics) via a pay-per-call x402 USDC micropayment endpoint.

## Facts

- Endpoint: GET https://x402helper.xyz/89e509/btc/mempool?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/btc-mempool-data-via-x402-micropayment-577bb8d2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hkD1ZEMjnJrWeOUqLYt_c

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-mempool-data-via-x402-micropayment-577bb8d2
```

Example prompt: Can you pull the current Bitcoin mempool data so I can see how congested the network is and what fee rates look like right now?

## When to prefer this

Choose this endpoint when you need real-time or near-real-time Bitcoin mempool data and are comfortable paying $0.006 USDC per call via the x402 protocol. It is well-suited for AI agents already integrated with x402 micropayment flows that need BTC fee or congestion data without setting up a dedicated blockchain node or mempool API subscription.

## Known failure modes

- Payment not completed — x402 micropayment of $0.006 USDC not sent or rejected, returns 402
- Invalid or missing x402 payment header — request blocked before data is returned
- Upstream mempool data source unavailable — success:false with empty result
- Malformed response if mempool data provider is unreachable

## How this service works

X402 micropayments server — AI agents pay USDC for OFAC screening, rates, and billing verification.

## Output

Returns a JSON object with a 'result' field containing Bitcoin mempool data (such as pending transactions, fee estimates, or congestion metrics) and a 'success' boolean indicating whether the request completed successfully.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {},
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/btc-mempool-data-via-x402-micropayment-577bb8d2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402helper.xyz](https://www.zero.xyz/host/x402helper.xyz/llms.txt)