Create Transaction

curl --request POST \
  --url https://staging.crossmint.com/api/2025-06-09/wallets/{walletLocator}/transactions \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <x-api-key>' \
  --data '
{
  "params": {
    "transaction": "<string>",
    "requiredSigners": [
      [
        "passkey:cWtP7gmZbd98HbKUuGXx5Q",
        "api-key:123456789",
        "external-wallet:0x1234567890123456789012345678901234567890",
        "email:[email protected]",
        "phone:+1234567890",
        "device:0x1234567890123456789012345678901234567890"
      ]
    ],
    "signer": [
      "passkey:cWtP7gmZbd98HbKUuGXx5Q",
      "api-key:123456789",
      "external-wallet:0x1234567890123456789012345678901234567890",
      "email:[email protected]",
      "phone:+1234567890",
      "device:0x1234567890123456789012345678901234567890"
    ]
  }
}
'

{
  "chainType": "evm",
  "walletType": "smart",
  "params": {
    "calls": [
      {
        "address": "<string>",
        "functionName": "<string>",
        "abi": [
          "<unknown>"
        ],
        "args": [
          "<unknown>"
        ],
        "value": "0"
      }
    ],
    "chain": "abstract",
    "signer": {
      "type": "external-wallet",
      "address": "<string>",
      "locator": "<string>"
    }
  },
  "onChain": {
    "userOperation": {
      "sender": "<string>",
      "nonce": "<string>",
      "callData": "<string>",
      "callGasLimit": "<string>",
      "verificationGasLimit": "<string>",
      "preVerificationGas": "<string>",
      "maxFeePerGas": "<string>",
      "maxPriorityFeePerGas": "<string>",
      "signature": "<string>",
      "paymaster": "<string>",
      "paymasterVerificationGasLimit": "<string>",
      "paymasterData": "<string>",
      "paymasterPostOpGasLimit": "<string>",
      "factory": "<string>",
      "factoryData": "<string>"
    },
    "userOperationHash": "<string>",
    "txId": "<string>",
    "explorerLink": "<string>"
  },
  "id": "<string>",
  "status": "awaiting-approval",
  "createdAt": "2024-01-01T00:00:00.000Z",
  "approvals": {
    "pending": [
      {
        "signer": {
          "type": "external-wallet",
          "address": "<string>",
          "locator": "<string>"
        },
        "message": "<string>"
      }
    ],
    "submitted": [
      {
        "signature": "<string>",
        "submittedAt": "2024-01-01T00:00:00.000Z",
        "signer": {
          "type": "external-wallet",
          "address": "<string>",
          "locator": "<string>"
        },
        "message": "<string>",
        "metadata": {
          "deviceInfo": "<string>",
          "ipAddress": "<string>",
          "userAgent": "<string>"
        }
      }
    ],
    "required": 123
  },
  "completedAt": "2024-01-01T00:00:00.000Z",
  "error": {
    "reason": "build_failed",
    "message": "<string>"
  },
  "sendParams": {
    "token": "<string>",
    "params": {
      "recipient": "<string>",
      "recipientAddress": "<string>",
      "amount": "<string>"
    }
  }
}

POST

2025-06-09

wallets

{walletLocator}

transactions

Create Transaction

curl --request POST \
  --url https://staging.crossmint.com/api/2025-06-09/wallets/{walletLocator}/transactions \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <x-api-key>' \
  --data '
{
  "params": {
    "transaction": "<string>",
    "requiredSigners": [
      [
        "passkey:cWtP7gmZbd98HbKUuGXx5Q",
        "api-key:123456789",
        "external-wallet:0x1234567890123456789012345678901234567890",
        "email:[email protected]",
        "phone:+1234567890",
        "device:0x1234567890123456789012345678901234567890"
      ]
    ],
    "signer": [
      "passkey:cWtP7gmZbd98HbKUuGXx5Q",
      "api-key:123456789",
      "external-wallet:0x1234567890123456789012345678901234567890",
      "email:[email protected]",
      "phone:+1234567890",
      "device:0x1234567890123456789012345678901234567890"
    ]
  }
}
'

{
  "chainType": "evm",
  "walletType": "smart",
  "params": {
    "calls": [
      {
        "address": "<string>",
        "functionName": "<string>",
        "abi": [
          "<unknown>"
        ],
        "args": [
          "<unknown>"
        ],
        "value": "0"
      }
    ],
    "chain": "abstract",
    "signer": {
      "type": "external-wallet",
      "address": "<string>",
      "locator": "<string>"
    }
  },
  "onChain": {
    "userOperation": {
      "sender": "<string>",
      "nonce": "<string>",
      "callData": "<string>",
      "callGasLimit": "<string>",
      "verificationGasLimit": "<string>",
      "preVerificationGas": "<string>",
      "maxFeePerGas": "<string>",
      "maxPriorityFeePerGas": "<string>",
      "signature": "<string>",
      "paymaster": "<string>",
      "paymasterVerificationGasLimit": "<string>",
      "paymasterData": "<string>",
      "paymasterPostOpGasLimit": "<string>",
      "factory": "<string>",
      "factoryData": "<string>"
    },
    "userOperationHash": "<string>",
    "txId": "<string>",
    "explorerLink": "<string>"
  },
  "id": "<string>",
  "status": "awaiting-approval",
  "createdAt": "2024-01-01T00:00:00.000Z",
  "approvals": {
    "pending": [
      {
        "signer": {
          "type": "external-wallet",
          "address": "<string>",
          "locator": "<string>"
        },
        "message": "<string>"
      }
    ],
    "submitted": [
      {
        "signature": "<string>",
        "submittedAt": "2024-01-01T00:00:00.000Z",
        "signer": {
          "type": "external-wallet",
          "address": "<string>",
          "locator": "<string>"
        },
        "message": "<string>",
        "metadata": {
          "deviceInfo": "<string>",
          "ipAddress": "<string>",
          "userAgent": "<string>"
        }
      }
    ],
    "required": 123
  },
  "completedAt": "2024-01-01T00:00:00.000Z",
  "error": {
    "reason": "build_failed",
    "message": "<string>"
  },
  "sendParams": {
    "token": "<string>",
    "params": {
      "recipient": "<string>",
      "recipientAddress": "<string>",
      "amount": "<string>"
    }
  }
}

Headers

X-API-KEY

string

required

API key required for authentication

x-idempotency-key

string

Unique key to prevent duplicate transaction creation

Path Parameters

walletLocator

string

required

A wallet locator can be of the format:

<walletAddress>
email:<email>:<chainType>[:<walletType>][:alias:<alias>] (walletType defaults to 'smart')
userId:<userId>:<chainType>[:<walletType>][:alias:<alias>] (white label user example)
phoneNumber:<phoneNumber>:<chainType>[:<walletType>][:alias:<alias>]
twitter:<handle>:<chainType>[:<walletType>][:alias:<alias>]
x:<handle>:<chainType>[:<walletType>][:alias:<alias>]
me:<chainType>[:<walletType>][:alias:<alias>] (Use when calling from the client side with a client API key)
chainType[:<walletType>]:alias:<alias>

Body

application/json

Solana Smart Wallet
Solana MPC Wallet
EVM Smart Wallet
EVM MPC Wallet
Stellar Smart Wallet

Input schema for creating a new transaction. The parameters vary based on the wallet type (EVM vs Solana vs Stellar).

params

object

required

Show child attributes

params.transaction

string

required

Base58 encoded serialized Solana transaction

params.requiredSigners

string[]

Optional array of additional signers required for the transaction

A signer locator that can be either a of format '' for external wallet type signers or ':'

params.signer

string

A signer locator that can be either a of format '' for external wallet type signers or ':'

Example:

[
  "passkey:cWtP7gmZbd98HbKUuGXx5Q",
  "api-key:123456789",
  "external-wallet:0x1234567890123456789012345678901234567890",
  "email:[email protected]",
  "phone:+1234567890",
  "device:0x1234567890123456789012345678901234567890"
]

Response

The transaction has been successfully created.

EVM Smart Wallet
EVM MPC Wallet
Solana Smart Wallet
Solana MPC Wallet
Stellar Smart Wallet

Complete transaction response including status, signing requirements, and wallet type specific data

chainType

enum<string>

required

The blockchain type of the wallet

Available options:

evm,

solana,

aptos,

sui,

stellar

walletType

enum<string>

required

The wallet type (smart or mpc)

Available options:

smart,

mpc

params

object

required

Show child attributes

params.calls

(EVM contract call transaction parameters · object | EVM direct calldata transaction parameters · object | EVM serialized transaction parameters · object)[]

required

Array of transaction calls to execute

Minimum array length: 1

Transaction data to execute

EVM contract call transaction parameters
EVM direct calldata transaction parameters
EVM serialized transaction parameters

Show child attributes

params.calls.address

string

required

The recipient address for this transaction call

params.calls.functionName

string

required

The name of the function to call

params.calls.abi

any[]

required

The ABI for the function to call

params.calls.args

any[]

required

The arguments to pass to the function

params.calls.value

string

default:0

The amount of native token to send in wei

params.chain

enum<string>

required

The chain on which the transaction will be executed

Available options:

abstract,

apechain,

arbitrum,

arbitrumnova,

avalanche,

base,

bsc,

flow,

mantle,

mode,

optimism,

plume,

polygon,

scroll,

sei-pacific-1,

shape,

story,

world-chain,

zora,

abstract-testnet,

arbitrum-sepolia,

avalanche-fuji,

base-sepolia,

curtis,

ethereum-sepolia,

flow-testnet,

mantle-sepolia,

mode-sepolia,

optimism-sepolia,

plume-testnet,

polygon-amoy,

scroll-sepolia,

sei-atlantic-2-testnet,

story-testnet,

world-chain-sepolia,

zora-sepolia,

arc-testnet,

tempo-testnet

params.signer

External Wallet Signer · object

The full signer object who will submit this transaction

Show child attributes

params.signer.type

enum<string>

required

Available options:

external-wallet

params.signer.address

string

required

The address of the external wallet

params.signer.locator

string

required

The locator of the external wallet signer

onChain

EVM smart wallet transaction data · object

required

Transaction data specific to EVM smart wallets

Show child attributes

onChain.userOperation

object

required

Show child attributes

onChain.userOperation.sender

string

required

onChain.userOperation.nonce

string

required

onChain.userOperation.callData

string

required

onChain.userOperation.callGasLimit

string

required

onChain.userOperation.verificationGasLimit

string

required

onChain.userOperation.preVerificationGas

string

required

onChain.userOperation.maxFeePerGas

string

required

onChain.userOperation.maxPriorityFeePerGas

string

required

onChain.userOperation.signature

string

required

onChain.userOperation.paymaster

string

onChain.userOperation.paymasterVerificationGasLimit

string

onChain.userOperation.paymasterData

string

onChain.userOperation.paymasterPostOpGasLimit

string

onChain.userOperation.factory

string

onChain.userOperation.factoryData

string

onChain.userOperationHash

string

required

onChain.txId

string

onChain.explorerLink

string

required

Unique identifier for the transaction

status

enum<string>

required

Current status of the transaction

Available options:

awaiting-approval,

pending,

failed,

success

createdAt

required

ISO timestamp when the transaction was created

Example:

"2024-01-01T00:00:00.000Z"

approvals

object

Complete approval data including requirements, pending and submitted signatures

Show child attributes

approvals.pending

object[]

required

List of pending signatures

Show child attributes

approvals.pending.signer

External Wallet Signer · object

required

The full signer object that's pending approval

Show child attributes

approvals.pending.signer.type

enum<string>

required

Available options:

external-wallet

approvals.pending.signer.address

string

required

The address of the external wallet

approvals.pending.signer.locator

string

required

The locator of the external wallet signer

approvals.pending.message

string

required

The message that needs to be signed

approvals.submitted

object[]

required

Record of all submitted signatures

Show child attributes

approvals.submitted.signature

string

required

The cryptographic signature

approvals.submitted.submittedAt

required

When the signature was submitted

Example:

"2024-01-01T00:00:00.000Z"

approvals.submitted.signer

External Wallet Signer · object

required

The full signer object who submitted this signature

Show child attributes

approvals.submitted.signer.type

enum<string>

required

Available options:

external-wallet

approvals.submitted.signer.address

string

required

The address of the external wallet

approvals.submitted.signer.locator

string

required

The locator of the external wallet signer

approvals.submitted.message

string

required

The message that was signed

approvals.submitted.metadata

object

Additional metadata about the signature submission

Show child attributes

approvals.submitted.metadata.deviceInfo

string

approvals.submitted.metadata.ipAddress

string

approvals.submitted.metadata.userAgent

string

approvals.required

number

Number of required approvals for the transaction

completedAt

ISO timestamp when the transaction reached finality

Example:

"2024-01-01T00:00:00.000Z"

error

object

Error message if the transaction fails after submission

Option 1
Option 2
Option 3

Show child attributes

error.reason

enum<string>

required

Available options:

build_failed,

failed_to_land_on_chain,

unknown,

sanctioned_wallet_address

error.message

string

required

sendParams

object

Show child attributes

sendParams.token

string

required

The token locator that's being sent

sendParams.params

object

required

The parameters for the send token transaction

Show child attributes

sendParams.params.recipient

string

required

The recipient locator for the token

sendParams.params.recipientAddress

string

required

The recipient address for the token

sendParams.params.amount

string

The amount of the token to send

Get NFTs from Wallet Get Transaction

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Create Transaction

Headers

Path Parameters

Body

Response