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POST
/
v1
/
w3s
/
developer
/
sign
/
transaction
Sign transaction
curl --request POST \
  --url https://api.circle.com/v1/w3s/developer/sign/transaction \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "walletId": "c4d1da72-111e-4d52-bdbf-2e74a2d803d5",
  "rawTransaction": "AgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgAIAAQROrEbiYfF3zCII9...",
  "transaction": "{\"nonce\":1,\"to\":\"0x9e4ebf23f713268b8e72cd162337f20c536357c9\",\"value\":\"10000000000000000\",\"gas\":\"21000\",\"maxFeePerGas\":\"42000000000\",\"maxPriorityFeePerGas\":\"25000000000\",\"chainId\":80002}",
  "memo": "Transfer USDC to Sam",
  "entitySecretCiphertext": "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",
  "blockchain": "MATIC-AMOY",
  "walletAddress": "0xca9142d0b9804ef5e239d3bc1c7aa0d1c74e7350"
}'
{
  "data": {
    "signature": "3W6r38STvZuBSmk2bbbct132SjEsYSARo3CJi3JQvNUaFoYu...",
    "signedTransaction": "AgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABpzlAhqqen7eyTe0KQ3w+9NS4E+7sscb+Cr...",
    "txHash": "0x4a25cc5e661d8504b59c5f38ba93f010e8518966f00e2ceda7955c4b8621357d"
  }
}

Authorizations

​
Authorization
string
header
required

Circle's API Keys are formatted in the following structure "PREFIX:ID:SECRET". All three parts are requred to make a successful request.

Headers

​
X-Request-Id
string

Developer-provided parameter used to identify this request. Useful when communicating with Circle Support.

Example:

"2adba88e-9d63-44bc-b975-9b6ae3440dde"

Body

application/json

Schema for the request payload to sign a transaction.

​
entitySecretCiphertext
string<byte>
required

A base64 string expression of the entity secret ciphertext. The entity secret should be encrypted by the entity public key. Circle mandates that the entity secret ciphertext is unique for each API request.

Example:

"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"

​
walletId
string<uuid>

System-generated unique identifier of the resource.

Example:

"c4d1da72-111e-4d52-bdbf-2e74a2d803d5"

​
rawTransaction
string

Raw transaction string that needs to be signed. Excluded with transaction. Required without transaction. Required to be base64 encoded for NEAR, Solana chains. Required to be hex encoded for EVM chains.

Example:

"AgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgAIAAQROrEbiYfF3zCII9..."

​
transaction
string

Transaction object in JSON that needs to be signed. Excluded with rawTransaction. Required without rawTransaction.

NOTE: This field is only supported by EVM chains.

Example:

"{\"nonce\":1,\"to\":\"0x9e4ebf23f713268b8e72cd162337f20c536357c9\",\"value\":\"10000000000000000\",\"gas\":\"21000\",\"maxFeePerGas\":\"42000000000\",\"maxPriorityFeePerGas\":\"25000000000\",\"chainId\":80002}"

​
memo
string

The human readable explanation for this sign action. Useful for presenting with extra information.

Example:

"Transfer USDC to Sam"

​
blockchain
enum<string>

The blockchain network that the resource is to be created on or is currently on.

Available options:
ETH,
ETH-SEPOLIA,
AVAX,
AVAX-FUJI,
MATIC,
MATIC-AMOY,
SOL,
SOL-DEVNET,
ARB,
ARB-SEPOLIA,
NEAR,
NEAR-TESTNET,
EVM,
EVM-TESTNET,
UNI,
UNI-SEPOLIA,
BASE,
BASE-SEPOLIA,
OP,
OP-SEPOLIA,
APTOS,
APTOS-TESTNET,
ARC-TESTNET
Example:

"MATIC-AMOY"

​
walletAddress
string

Blockchain generated unique identifier, associated with wallet (account), smart contract or other blockchain objects.

Example:

"0xca9142d0b9804ef5e239d3bc1c7aa0d1c74e7350"

Response

Successfully signed a transaction.

​
data
object
required