BitcoinBitcoin API Endpoints

estimatesmartfee

Estimates the approximate fee per kilobyte required for a transaction to begin confirmation within conf_target blocks. Uses BIP 141 virtual transaction size.

⚠ This endpoint is only available with Blast access.

Path parameters

apiKeystringRequired

Request

This endpoint expects an object.
conf_targetintegerRequired>=1<=1008
Number of blocks within which confirmation is targeted.
estimate_modeenumOptional
Fee estimate mode. Options are "UNSET", "ECONOMICAL", or "CONSERVATIVE".
Allowed values:

Response

Estimated fee rate and corresponding target blocks.
feeratedouble or null
Estimated fee rate in BTC per KB.
blocksinteger or null

The actual confirmation target (may differ if estimate unavailable).