fetchFeeEstimateTransaction

Estimates the total transaction fee in microSTX for a Stacks transaction. Queries the node's /v2/fees/transaction endpoint with the serialized payload.

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Usage

import { fetchFeeEstimateTransaction, bytesToHex, serializePayloadBytes } from '@stacks/transactions';

const [low, medium, high] = await fetchFeeEstimateTransaction({
  payload: '0x00...', // hex-encoded serialized transaction payload
  estimatedLength: 350, // optional estimated byte length
  network: 'testnet',
});

console.log(medium.fee); // e.g. 3000

Notes

• Returns three fee estimations (low, medium, high).
• Throws NoEstimateAvailableError if the node has not seen this type of contract call before.
• Use fetchFeeEstimate for automatic fallback behavior.

Reference Link

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Signature

function fetchFeeEstimateTransaction(opts: {
  payload: string;
  estimatedLength?: number;
} & NetworkClientParam): Promise<[FeeEstimation, FeeEstimation, FeeEstimation]>;

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Returns

Promise<[FeeEstimation, FeeEstimation, FeeEstimation]>

interface FeeEstimation {
  fee: number;
  fee_rate: number;
}

A tuple of three fee estimations: [low, medium, high].

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Parameters

opts.payload (required)

• Type: string

The hex-encoded serialized transaction payload.

opts.estimatedLength (optional)

• Type: number

Optional estimated final length (in bytes) of the transaction, including post-conditions and signatures.

opts.network (optional)

• Type: StacksNetworkName | StacksNetwork

The network to query. Defaults to 'mainnet'.

opts.client (optional)

• Type: NetworkClient

Custom client configuration for the API call.