# Bitcoin Mempool Fees

> Bitcoin Mempool Fees is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-29).

Returns current Bitcoin mempool fee estimates (sat/vByte) for transaction confirmation targets

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/crypto/bitcoin-mempool-fees?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bitcoin-mempool-fees-43ab441b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CHyLQYXGDMuDCmD5aaEs5

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-mempool-fees-43ab441b
```

Example prompt: What are the current Bitcoin mempool fees — give me the recommended sat/vByte for fast, medium, and slow confirmation right now?

## When to prefer this

Use this endpoint when an AI agent needs real-time Bitcoin transaction fee recommendations without requiring API key registration. Ideal for pay-per-call workflows via x402/USDC where the agent autonomously decides the fee tier for a pending BTC transaction. Prefer over manual mempool.space scraping or heavier blockchain node integrations.

## Known failure modes

- Mempool data source unavailable — returns error or stale data
- Network timeout if Bitcoin node connection is slow
- Invalid schema parameter returns 400 or empty response
- Mempool data may lag real-time by a few minutes during high congestion

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

Returns current Bitcoin mempool fee estimates across different confirmation speed tiers (e.g. fastest, half-hour, hour), expressed in satoshis per vByte, reflecting real-time mempool congestion.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bitcoin-mempool-fees-43ab441b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)