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Bitcoin Transaction Fee Rates & Cost Estimator
x402
Bitcoin Transaction Fee Rates & Cost Estimator is a paid API for AI agents from chain.openverbs.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).
Returns live recommended Bitcoin fee rates (sat/vB) for five confirmation-speed tiers and estimates total fee cost for a transaction of a given virtual size.
Price / call$0.006
Success—
StatusUnknown
How this service works
Live recommended Bitcoin transaction fee rates (in sat/vB) for next-block, ~30-minute, ~1-hour, economy and minimum confirmation targets, straight from the mempool. Also estimates the total fee (in sats and BTC) for a transaction of the given virtual size, so an agent can pick a fee tier and know the cost before broadcasting.
Output
A structured response containing recommended fee rates in sat/vB for five tiers (next-block, ~30-minute, ~1-hour, economy, minimum), plus the estimated total fee in satoshis and BTC for a transaction of the requested virtual size at each tier, sourced live from the Bitcoin mempool.
Example use cases
Wallet fee picker before broadcast
“Before I send this Bitcoin transaction, what fee rate should I use to get confirmed within 30 minutes, and how much will it cost total for a 192 vbyte transaction in both sats and BTC?”
Fee monitoring for cost-sensitive send
“I'm in no rush — what's the economy fee rate for Bitcoin right now, and what would the total fee be for a standard 140 vbyte transaction?”
Next-block urgency fee check
“I need this Bitcoin payment confirmed in the next block — what's the current fastest fee rate in sat/vB and what's the estimated total cost for a 300 vbyte transaction?”
Technical details
Endpoint
POSThttps://chain.openverbs.com/v1/btc-feesWhen to prefer
Use this endpoint when an agent needs to make fee-tier decisions before constructing or broadcasting a Bitcoin transaction, or when a user wants to know the real-time cost of sending Bitcoin at different confirmation speeds. It is purpose-built for Bitcoin fee estimation with per-tier breakdown and cost calculation in a single call, making it preferable to generic blockchain explorers that may not provide multi-tier fee estimates or cost projections.
Side effects
- txvBytes out of range (below 1 or above 1,000,000) returns a validation error
- Mempool data temporarily unavailable returns a 503 or error response
- Malformed request body returns a 400 bad request
- Network timeout if mempool source is slow to respond
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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