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chainquery estimatesmartfee — Bitcoin fee rate estimation via x402
x402
chainquery estimatesmartfee — Bitcoin fee rate estimation via x402 is a paid API for AI agents from x402.chainquery.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Returns the estimated fee rate (BTC/kvB) needed to confirm a Bitcoin transaction within a target number of blocks, via Bitcoin Core's estimatesmartfee RPC on chainquery's independent full node.
Price / call$0.005
Success—
StatusUnknown
How this service works
chainquery Bitcoin RPC: pay-per-call Bitcoin Core over x402, no API key. Estimated fee rate (BTC/kvB) to confirm within a target number of blocks, from chainquery's independent full node. Bitcoin Core estimatesmartfee.
Output
Returns Bitcoin Core's estimatesmartfee result: a fee rate in BTC/kvB recommended to confirm within the specified number of blocks, plus the number of blocks over which the estimate was calculated. May also include an 'errors' field if estimation data is insufficient.
Example use cases
Example prompt
“What fee rate in BTC/kvB do I need to get my Bitcoin transaction confirmed within 6 blocks? Use chainquery's independent full node for the estimate.”
Technical details
Endpoint
GEThttps://x402.chainquery.com/v1/rpc/estimatesmartfeeWhen to prefer
Choose this endpoint when you need a fee estimate from an independent Bitcoin Core full node without registering for an API key — ideal for pay-as-you-go usage, cross-checking fee estimates against other providers, or when building workflows that need on-demand fee data billed per call via x402/USDC micropayment.
Side effects
- Insufficient data in mempool to produce a reliable estimate — returns errors array in result
- Invalid or missing params JSON causes a 400-level error
- Payment failure or x402 protocol error prevents call from executing
- Node temporarily unreachable or syncing returns an error response
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"params": "[6]"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"result": {
"blocks": 6,
"feerate": 0.00001016
}
}Tags
x402
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