# ScriptMasterLabs BTC Mempool Fee Tracker

> ScriptMasterLabs BTC Mempool Fee Tracker is a paid API for AI agents from acp-x402-scriptmasterlabs.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).

Returns current Bitcoin mempool fee estimates (e.g. slow, medium, fast sat/vByte rates) via a pay-per-call x402 USDC-settled API.

## Facts

- Endpoint: GET https://acp-x402-scriptmasterlabs.onrender.com/x402/btc-mempool-fees?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/scriptmasterlabs-btc-mempool-fee-tracker-e583631c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ludgMo2GEyBh6lBoXT6P6

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 scriptmasterlabs-btc-mempool-fee-tracker-e583631c
```

Example prompt: What are the current Bitcoin mempool fee rates — slow, medium, and fast — right now so I know what sat/vByte to use for my transaction?

## When to prefer this

Choose this endpoint when you need real-time Bitcoin mempool fee estimates and are operating in a crypto-native, x402-compatible payment environment settling in USDC on Base. It is well-suited for AI agents that already handle x402 micropayments and need lightweight, pay-per-call access without a subscription. Prefer alternatives with richer documentation if exact schema fidelity is critical.

## Known failure modes

- Payment not settled — 402 response if USDC payment via x402 is not included or insufficient
- Mempool data unavailable — upstream Bitcoin node or data provider outage returns an error or empty response
- Rate limiting — excessive calls may be throttled
- Malformed response — example schema is empty so exact field names are undocumented and may vary
- Cold start latency — hosted on Render free tier, may have slow initial response after inactivity

## How this service works

Pay-per-call crypto, RWA, federal, SEC, and compliance APIs. Settled in USDC on Base via x402. Hyphen routes only (e.g. /x402/rwa-aggregates, /x402/gas-tracker).

## Output

Returns current Bitcoin mempool fee estimates broken down by priority tier (e.g. slow, medium, fast) expressed in satoshis per virtual byte (sat/vByte), reflecting real-time network conditions. Delivered as a JSON response after micropayment settlement in USDC on Base via x402.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/scriptmasterlabs-btc-mempool-fee-tracker-e583631c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from acp-x402-scriptmasterlabs.onrender.com](https://www.zero.xyz/host/acp-x402-scriptmasterlabs.onrender.com/llms.txt)