# BTC Fee Rate Lookup via x402 Micropayment

> BTC Fee Rate Lookup 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 current Bitcoin network fee rates via a paid x402 micropayment endpoint costing $0.006 USDC per call.

## Facts

- Endpoint: GET https://x402helper.xyz/89e509/btc/fees?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-fee-rate-lookup-via-x402-micropayment-9741855a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FxPWBKIdNqGg-RDBi5mkP

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-fee-rate-lookup-via-x402-micropayment-9741855a
```

Example prompt: What are the current Bitcoin network fee rates? I need to know the recommended sat/vbyte for a normal-priority transaction before I send.

## When to prefer this

Choose this endpoint when you need real-time Bitcoin fee rate data and are operating in an x402-enabled agent environment that can handle USDC micropayments. It is useful when you want a pay-per-query model without API key management. Prefer alternatives if you need free access, higher call volume, or guaranteed SLAs.

## Known failure modes

- Payment failure: x402 USDC micropayment not completed, returns 402 Payment Required
- Invalid or missing payment header causes authentication rejection
- Network timeout if bitcoin mempool data source is unavailable
- Empty or null result if fee data cannot be fetched from upstream
- Rate limiting if too many requests are made in rapid succession

## How this service works

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

## Output

A JSON object containing a 'result' field with current Bitcoin fee rate data (e.g. sat/vbyte tiers for different confirmation speeds) and a 'success' boolean indicating whether the lookup succeeded.

## 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-fee-rate-lookup-via-x402-micropayment-9741855a/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)