testmempoolaccept | Alchemy Docs

1 import requests 2 3 url = "https://bitcoin-mainnet.alchemy-blast.com/v2/:apiKey" 4 5 payload = { 6 "0": ["0200000000010142d6bd07c424e975fe821c978e720f9a55f9981d62c290cea5ccd06b455d79b90000000000fdffffff028096980000000000160014d3620fe180a0beb8fcc9682fe92e5a25f0feccd370cd2f0100000000160014076d998f6b12c3d1da6217d967154f42a5e0afd30247304402204549b10ea1698d4b4605be1d3bfff810f6135395386207664a66f5bb8bd1470902205fb86c95bfbe7b502195ffa65276d292fb074fe18ba171ef0a35395211384091012103cb5de30b343b35cc09b50f064eb289dd3e252f6985fc4309fba795cc950316afcfa50d00"], 7 "1": 0 8 } 9 headers = {"Content-Type": "application/json"} 10 11 response = requests.post(url, json=payload, headers=headers) 12 13 print(response.json())

1 { 2 "jsonrpc": "2.0", 3 "id": "1", 4 "result": [ 5 { 6 "txid": "054183ee699ff12cf1c9f4413f421c3cf0a8febc6b82a1d8751a30f5e0fd54c0", 7 "wtxid": "b07f26a908955f8071620896476d6e2ca6b6610e5edc9e55f19185ca9536c8de", 8 "allowed": true 9 } 10 ] 11 }

Indicates whether one or more raw transactions (serialized, hex-encoded) would be accepted by the mempool.

⚠ This endpoint is only available with Blast access.

Path parameters

apiKeystringRequired

Request

This endpoint expects an object.

rawtxslist of stringsRequired

An array of hex-encoded raw transactions to test for mempool acceptance.

maxfeeratedoubleOptional

Reject transactions whose fee rate is higher than the specified value, expressed in BTC/kB.

Response

Result of the mempool acceptance test for each transaction.

txidstring or nullformat: "^[a-fA-F0-9]{64}$"

A 64-character hex string identifying a transaction.

wtxidstring or null

Witness transaction ID, if available.

allowedboolean or null

Whether the transaction would be accepted to the mempool.

reject-reasonstring or null

Reason for rejection if not allowed.