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BTC Node Fee Estimator
x402
BTC Node Fee Estimator is a paid API for AI agents from btcnode.uk, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Returns a Bitcoin transaction fee estimate for any target confirmation block from 1 to 1008
Price / call$0.001
Success—
StatusUnknown
How this service works
Fee estimate for ANY target block (1-1008) — flat $0.001 per call, USDC on Base, no signup.
Output
Returns a fee rate estimate (typically in sat/vbyte) appropriate for getting a Bitcoin transaction confirmed within the specified target number of blocks, sourced directly from a live Bitcoin Core node's fee estimation engine.
Example use cases
Urgent Bitcoin payment fee check
“I need to send Bitcoin right now and want it confirmed in the next block — what fee rate in sat/vbyte should I set?”
Economy fee for non-urgent transfer
“I'm moving some BTC and I'm not in a rush — what's the cheapest fee estimate if I'm okay waiting up to 144 blocks for confirmation?”
Automated wallet fee suggestion
“My app is sending a Bitcoin transaction and needs to auto-set the fee — can you fetch the recommended sat/vbyte rate for a 6-block confirmation target?”
Technical details
Endpoint
GEThttps://btcnode.uk/api/fees/estimate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time Bitcoin transaction fee estimates sourced directly from a live Bitcoin Core node, especially if you want flexible confirmation-window targeting (any value from 1 to 1008 blocks). Prefer it over mempool.space scrapers or indirect APIs when you want low-cost ($0.001/call), no-signup, programmatic fee lookups with a wide range of block targets.
Side effects
- Invalid block target outside 1-1008 range returns an error
- Bitcoin Core node temporarily unavailable causes timeout or 503
- Insufficient mempool history for accurate estimate at extreme block targets (e.g. 1008) may return a fallback or error
- Payment not received (402) if USDC on Base is not provided
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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