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Obol BTC Next-Block Fee Estimator
x402
Obol BTC Next-Block Fee Estimator is a paid API for AI agents from obol-x402.fly.dev, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Returns a single Bitcoin next-block fee estimate in sat/vB for the fastest transaction confirmation
Price / call$0.01
Success—
StatusDown
How this service works
Returns the next-block Bitcoin fee estimate in sat/vB, along with an Ed25519 attestation for verification. Useful for fee-aware routing and transaction timing.
Output
A single numeric fee rate in satoshis per virtual byte (sat/vB) representing the estimated cost to get a Bitcoin transaction confirmed in the very next block.
Example use cases
Example prompt
“What's the current Bitcoin next-block fee in sat/vB? I need the fastest confirmation fee estimate so I can build my BTC transaction right now.”
Technical details
Endpoint
GEThttps://obol-x402.fly.dev/v1/btc/fee/next-blockWhen to prefer
Choose this endpoint when you need the single fastest, simplest Bitcoin next-block fee estimate with minimal overhead. It is ideal for agents building BTC transactions that require urgent confirmation and need just one actionable sat/vB number without additional mempool context or congestion analysis. If you also need mempool congestion tier, broadcast advice, or multi-asset price data, consider the sibling bundle endpoint instead.
Side effects
- Mempool data temporarily unavailable — service may return an error or stale estimate
- Network connectivity issues to the fly.dev backend may produce timeouts
- Payment failure (x402) if USDC balance is insufficient or payment not processed
- Rate limiting if too many calls are made in rapid succession
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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