Priority fee helius

gistfile1.txt

export async function getPriorityFeeEstimateForIxs(
  ixs: TransactionInstruction[],
  priorityLevel: PriorityConfigLevel = PriorityConfigLevel.NORMAL,
): Promise<number | null> {
  try {
    const heliusPriorityLevel: string = (() => {
      switch (priorityLevel) {
        case PriorityConfigLevel.NORMAL:
          return 'Medium'
        case PriorityConfigLevel.HIGH:
          return 'High'
        case PriorityConfigLevel.TURBO:
          return 'VeryHigh'
        default:
          return 'Medium'
      }
    })()
    const tx = new Transaction().add(...ixs)
    tx.recentBlockhash = (
      await getConnection(false).getLatestBlockhash()
    ).blockhash
    tx.feePayer = new PublicKey('AYY3Z86CoEuyRMj1suNreb3V3tqxFzVtZi5KYfoPPAHL') // arbitrary
    const priorityFeeEstimate: number = (
      await axios.post(
        HELIUS_MAINNET_API_URL,
        {
          jsonrpc: '2.0',
          id: 'my-id',
          method: 'getPriorityFeeEstimate',
          params: [
            {
              transaction: bs58.encode(
                tx.serialize({ verifySignatures: false }),
              ),
              options: {
                priorityLevel: heliusPriorityLevel,
              },
            },
          ],
        },
        {
          headers: {
            'Content-Type': 'application/json',
          },
        },
      )
    ).data.result.priorityFeeEstimate
    if (priorityFeeEstimate === undefined) return null
    return Math.floor(priorityFeeEstimate)
  } catch (error) {
    console.log('Error at getPriorityFeeEstimateForIxs(Helius), Error: ', error)
    return null
  }
}