alchemy_requestFeePayer

Requests gas sponsorship for a Solana transaction and returns the fully-signed serializedTransaction (now containing the fee-payer signature).

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Path parameters

apiKeystringRequired

Request

This endpoint expects an object.

policyIdstring or list of stringsRequired

The policy ID (or list of IDs) that governs sponsorship.

serializedTransactionstringRequiredformat: "^[A-Za-z0-9+/]+={0,2}$"

The unsigned transaction produced by tx.serialize(). It may already contain a feePayer; the service will overwrite it with the sponsoring account and add the fee-payer signature.

webhookDatastringOptional

Optional metadata (e.g. proof-of-humanity) that is forwarded to any policy-level webhooks.

Response

Object containing the fully-signed transaction ready for sendRawTransaction.

serializedTransactionstring

The transaction after the service sets the feePayer field and adds the fee-payer signature.

1	import requests
2
3	url = "https://eth-mainnet.g.alchemy.com/v2/:apiKey"
4
5	payload = {}
6	headers = {"Content-Type": "application/json"}
7
8	response = requests.post(url, json=payload, headers=headers)
9
10	print(response.json())

1	{
2	"jsonrpc": "2.0",
3	"id": "1",
4	"result": {
5	"serializedTransaction": "AQIDBAUGBwgJCgsMDQ4PEA=="
6	}
7	}