# Bitcoin Recommended Fee Rates API

> Bitcoin Recommended Fee Rates API is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Returns current Bitcoin recommended fee rates in sat/vB across five priority tiers (fastest, half-hour, hour, economy, minimum) sourced from mempool.space

## Facts

- Endpoint: GET https://api.x402node.dev/chain/btc-fees
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-x402node-dev-7a1b82fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_e_4XyCsAhRW5mAJaNIHgI

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 api-x402node-dev-7a1b82fb
```

Example prompt: What are the current Bitcoin fee rates — I need the sat/vB recommendations for fast, half-hour, hour, economy, and minimum priority so I can pick the right one for my transaction.

## When to prefer this

Use this endpoint when an AI agent or application needs current Bitcoin fee rate recommendations without requiring a mempool.space API key. Ideal for transaction construction workflows, fee estimation UIs, or wallet tooling that needs all five priority tiers in a single call. Prefer over direct mempool.space calls when operating in an x402 micropayment environment or when a no-auth, pay-per-call model is preferred.

## Known failure modes

- mempool.space upstream unavailable — proxy may return 502 or error JSON
- Stale data if mempool.space cache is lagged during high-traffic periods
- Payment failure (x402 protocol) if USDC balance is insufficient — returns 402
- No parameters accepted; passing a body may be ignored or cause unexpected behavior

## How this service works

Bitcoin recommended fee rates (sat/vB) for fast/half-hour/hour/economy/minimum via mempool.space. Use no params. Built for AI agents constructing BTC transactions, fee estimation UIs. Accepts payment on Base or Solana — either network works.

## Output

Returns five fee rate tiers in sat/vB: fastest (next block), half-hour confirmation, one-hour confirmation, economy, and minimum. Values are sourced live from mempool.space and reflect current mempool conditions.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-x402node-dev-7a1b82fb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.x402node.dev](https://www.zero.xyz/host/api.x402node.dev/llms.txt)