/v1/transactions/simulate

Simulates a transaction without committing it to the chain. The output includes transaction events and execution results, but omits state hashes. Useful for estimating gas usage and transaction validity. You must provide a SignedTransaction with a zero-padded signature. Optional flags allow estimating gas price, max gas amount, or using a prioritized gas price.

⚠ This endpoint is only available with Blast access.

Query parameters

estimate_gas_unit_pricebooleanOptional

If true, replaces the transaction's gas unit price with the estimated value.

estimate_max_gas_amountbooleanOptional

If true, overrides the max gas with the estimated maximum.

estimate_prioritized_gas_unit_pricebooleanOptional

If true, uses a higher gas price than the standard estimate to prioritize the transaction.

Request

This endpoint expects an object.

senderstringRequired

sequence_numberstringRequired

max_gas_amountstringRequired

gas_unit_pricestringRequired

expiration_timestamp_secsstringRequired

payloadobjectRequired

signatureobjectRequired

Response

Simulation results including execution status and events.

versionstring or null

hashstring or null

gas_usedstring or null

successboolean or null

vm_statusstring or null

typestring or null

senderstring or null

sequence_numberstring or null

max_gas_amountstring or null

gas_unit_pricestring or null

expiration_timestamp_secsstring or null

payloadobject or null

signatureobject or null

1	import requests
2
3	url = "https://aptos-mainnet.alchemy-blast.com/v2/:apiKey/v1/transactions/simulate"
4
5	payload = {
6	"sender": "0x88fbd33f54e1126269769780feb24480428179f552e2313fbe571b72e62a1ca1",
7	"sequence_number": "32425224034",
8	"max_gas_amount": "32425224034",
9	"gas_unit_price": "32425224034",
10	"expiration_timestamp_secs": "32425224034"
11	}
12	headers = {"Content-Type": "application/json"}
13
14	response = requests.post(url, json=payload, headers=headers)
15
16	print(response.json())