getComputationFee

getComputationFee(arciumProgram, mxeProgramId, computationOffset, commitment?): Promise<{ baseFee: BN; callbackCuLimit: number; priorityFee: BN; source: "account"; } | null>

Fetch a live computation's on-chain fee by its offset.

Returns the ComputationFee account variant while the computation account is alive, or null once it has been closed (claim_computation_rent, reclaim_expired_computation_fee, or a failure-claim flow). There is no automatic fallback for closed accounts: the on-chain data is gone, so a caller that stored the queue tx signature must pass it to getComputationFeeFromQueueTx to reconstruct the fee inputs.

Throws if the live account at (cluster, offset) belongs to a different MXE: the computation PDA is keyed on (cluster, comp_offset) only, so two MXEs on a shared cluster can collide on it across lifecycles, and silently returning the wrong MXE's fee would be a correctness bug.

Parameters

Returns

Promise<{ baseFee: BN; callbackCuLimit: number; priorityFee: BN; source: "account"; } | null>

The live account fee, or null if the account is closed.

Example

import { getArciumProgram, getComputationFee, getComputationFeeFromQueueTx } from '@arcium-hq/reader';

const program = getArciumProgram(provider);
const fee = await getComputationFee(program, mxeProgramId, computationOffset);
if (fee) {
  console.log('Live fee:', fee.baseFee.add(fee.priorityFee).toString());
}
else {
  // Closed: reconstruct from the stored queue tx signature.
  const queued = await getComputationFeeFromQueueTx(program, queueTxSignature, mxeProgramId, computationOffset);
  console.log('cuPriceMicro:', queued.cuPriceMicro.toString());
}