# Bitcoin Fee Estimate

> Bitcoin Fee Estimate is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Returns current Bitcoin network fee estimates (fastest, half-hour, economy, and minimum) in satoshis per byte

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/btc-fee-estimate?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bitcoin-fee-estimate-002e10b2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zaDlL7PCK3oLWCufOCLRX

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-fee-estimate-002e10b2
```

Example prompt: What are the current Bitcoin transaction fees — fastest, half-hour, economy, and minimum — in sats per byte right now?

## When to prefer this

Choose this endpoint when you need real-time Bitcoin fee estimates without managing API keys or accounts. Ideal for agents that need to programmatically set transaction fees, monitor fee spikes, or trigger fee-aware logic. Pay-per-call at $0.002 USDC makes it cost-effective for occasional lookups without subscriptions.

## Known failure modes

- Upstream Bitcoin fee data source is unavailable — returns 5xx error
- Payment via x402 fails due to insufficient USDC balance — returns 402
- Network timeout if Bitcoin mempool data feed is slow
- Stale fee data if the underlying provider hasn't updated recently

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

A JSON object with five fee tiers in satoshis per byte: fastestFee (next block), halfHourFee (within ~30 min), hourFee (within ~60 min), economyFee (low priority), and minimumFee (absolute minimum accepted by the network).

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "hourFee": 1,
  "economyFee": 1,
  "fastestFee": 1,
  "minimumFee": 1,
  "halfHourFee": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bitcoin-fee-estimate-002e10b2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)