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Bitcoin Fee Estimates API (sat/vB)
x402
Bitcoin Fee Estimates API (sat/vB) is a paid API for AI agents from money-reactor.makar52nn2016.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-31).
Returns Bitcoin transaction fee estimates in satoshis per vByte for multiple confirmation targets, sourced from Blockstream.info
Price / call$0.1
Success—
StatusUnknown
How this service works
Bitcoin fee estimates (sat/vB) per confirmation target from blockstream.info - send-cost planning for BTC agents and treasury bots
Output
Returns a JSON object with Bitcoin fee estimates expressed in satoshis per vByte (sat/vB) for various confirmation targets (e.g. next block, within 3 blocks, within 6 blocks), sourced live from Blockstream.info. Useful for determining the appropriate fee to attach to a Bitcoin transaction based on urgency.
Example use cases
Treasury bot send-cost planning
“Before I send this Bitcoin payment from the treasury, check the current sat/vB fee estimates so we can pick the right fee tier to confirm within the next block without overpaying.”
User-facing BTC wallet fee suggestion
“My app needs to show users the current Bitcoin fee options — can you pull the latest fee rates in sat/vB for 1-block, 3-block, and 6-block confirmation targets?”
Automated fee alerting for low-cost windows
“Check the current Bitcoin network fee rates and let me know if the fast-confirmation sat/vB rate has dropped below 20 so I can schedule my BTC transfer now.”
Technical details
Endpoint
GEThttps://money-reactor.makar52nn2016.workers.dev/api/btc-fees?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time Bitcoin fee estimates in sat/vB for send-cost planning, treasury automation, or user-facing wallet fee suggestions. Prefer this over raw mempool APIs when you want a simple, pre-parsed fee schedule without standing up your own Bitcoin node or Blockstream integration. Best suited for agents and bots that need a quick, pay-per-call fee lookup without managing API keys.
Side effects
- Blockstream.info upstream outage returns error or stale data
- Network timeout on the Cloudflare Worker proxy
- Rate limiting or payment failure returns 402
- Mempool data may be momentarily stale during high-congestion periods
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Tags
x402
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