wallet_prepareCalls | Alchemy Docs

1 curl -X POST https://api.g.alchemy.com/v2/{apiKey} \ 2 -H "Content-Type: application/json" \ 3 -d '{ 4 "jsonrpc": "2.0", 5 "method": "wallet_prepareCalls", 6 "params": [ 7 { 8 "calls": [ 9 { 10 "to": "0x1234567890123456789012345678901234567890", 11 "data": "0x" 12 } 13 ], 14 "from": "0xa363219d7C0b8673df17529D469Db9eFF0f35D2A", 15 "chainId": "0x01", 16 "capabilities": { 17 "paymasterService": { 18 "policyId": "11111111-2222-3333-4444-555555555555" 19 } 20 } 21 } 22 ], 23 "id": 1 24 }'

1 { 2 "jsonrpc": "2.0", 3 "id": "1", 4 "result": { 5 "type": "user-operation-v070", 6 "data": { 7 "sender": "0xa363219d7C0b8673df17529D469Db9eFF0f35D2A", 8 "nonce": "0x10000000000000000", 9 "callData": "0x34fcd5be0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000000", 10 "paymaster": "0x3f222Df6aB18C1E10d0Ec136503c3B0dfd929048", 11 "paymasterData": "0x0000000000000000682d7e7c9fa6f71c28c31141a11ac9eb2bdbe898ddbd42a4f7085f8bb3380ba75dd9231a386e24fe5a84777217c907391e983b5b0f78a4a9d0fd1c8631dd22c10e106b461c", 12 "paymasterPostOpGasLimit": "0x0", 13 "paymasterVerificationGasLimit": "0x74d3", 14 "maxPriorityFeePerGas": "0x60e4b0", 15 "maxFeePerGas": "0x1bf52290", 16 "callGasLimit": "0x2bb8", 17 "verificationGasLimit": "0xc845", 18 "preVerificationGas": "0x14b74" 19 }, 20 "chainId": "0x66eee", 21 "signatureRequest": { 22 "type": "personal_sign", 23 "data": { 24 "raw": "0xc69e468aa6fafb5c7298c02841e76f976b433018266af39a5807bc29ea9ad392" 25 }, 26 "rawPayload": "0x2a8073568c8fad3edf15f70c3471a7fff18e1d57c650a501ab47f57a5c1f0e39" 27 }, 28 "feePayment": { 29 "sponsored": false, 30 "tokenAddress": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", 31 "maxAmount": "0x1f34" 32 } 33 } 34 }

This method is used to prepare a user operation for submission. It will return a built user operation and a signature request which needs to be signed by the user before submitting to wallet_sendPreparedCalls

Path Parameters

apiKeystringRequiredDefaults to docs-demo

Request

This endpoint expects an object.

params[0]objectRequired

Response

This endpoint returns an object.

object

Array of prepared calls

object

Prepared User Operation (Entrypoint v0.6.0)

object

Prepared User Operation (Entrypoint v0.7.0)

object

Prepared ERC-7597 Permit Signature Request for the paymaster