Developer Services

Signing APIs

You can use Circle's API platform's signing APIs on blockchains where Wallets do not have full blockchain infrastructure support.

Wallets offers key signing capabilities to a broader range of blockchains where we don't yet have full blockchain infrastructure support, such as NEAR and other EVM chains. You can leverage Circle's advanced MPC key management for signing, and integrate with your own node and data service of choice. Circle offers SDKs and APIs to manage user authentication, wallet creation, and signing capabilities that integrate with your blockchain infrastructure.

See our step-by-step tutorials for how to sign transactions on different blockchains:

Signing endpoints

You can use the following API endpoints for signing capabilities such as sign transaction, sign typed data, or sign message.

POST /developer/sign/message
POST /developer/sign/typedData
POST /developer/sign/transaction
POST /developer/sign/delegateAction
POST /user/wallets
POST /user/sign/message
POST /user/sign/typedData
POST /user/sign/transaction

Disclaimer

Using the sign transaction endpoints involves critical actions that can impact your assets and transactions.

Signing transactions carries inherent security risks. Malicious actors can trick users into signing what appears to be a legitimate transaction message. This could potentially allow them to gain unauthorized access to your funds. Always ensure that you are signing transactions only from trusted sources and verify the legitimacy of transaction requests before proceeding.

Programmable Wallet capabilities

The following table shows the difference in Programmable Wallet capabilities offered on fully managed blockchains vs. Near and other blockchains.

	Fully managed blockchains	NEAR and other EVM chains
Wallet Features	User authentication Wallet creation Full transaction lifecycle management: - Signing tx or messages - Broadcast - Monitor deposit - Index tx and balances	User authentication Wallet creation Signing tx or messages
Wallet Infrastructure	Developer-controlled wallets User-controlled wallets	Developer-controlled wallets User-controlled wallets (except NEAR)
Circle Contracts Support	Contracts APIs support for most of the chains that PW APIs support (given that the specified chains support smart contracts)	Not supported
Gas Station Support	Access to Gas Station to enable gas sponsorship for all smart contract account wallets Self-serve ability to set up Paymaster policies Available for chains supported by PW that supports smart contract accounts or native gas station for EOA	N/A Supports only EOA wallets. As Gas Station and paymaster policies require the use of SCA Wallets, Gas Station is not supported in this offering.

Fully managed blockchains

NEAR and other EVM chains

Wallet Features

User authentication

Wallet creation

Full transaction lifecycle management:
- Signing tx or messages
- Broadcast
- Monitor deposit
- Index tx and balances

User authentication

Wallet creation

Signing tx or messages

Wallet Infrastructure

Developer-controlled wallets

User-controlled wallets

Developer-controlled wallets

User-controlled wallets (except NEAR)

Circle Contracts Support

Contracts APIs support for most of the chains that PW APIs support (given that the specified chains support smart contracts)

Not supported

Gas Station Support

Access to Gas Station to enable gas sponsorship for all smart contract account wallets

Self-serve ability to set up Paymaster policies

Available for chains supported by PW that supports smart contract accounts or native gas station for EOA

N/A

Supports only EOA wallets. As Gas Station and paymaster policies require the use of SCA Wallets, Gas Station is not supported in this offering.

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