sandbox.overledger.dev

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About Overledger

Overledger is the flagship product of Quant Network, designed as an API-based gateway that enables enterprises to connect traditional financial systems with multiple blockchain networks simultaneously without modifying underlying chain code. It operates as a layer above existing blockchains (not a new chain), supporting asset issuance, smart contract deployment, and cross-ledger transactions. In 2026, Overledger is being used as the core interoperability layer in the UK's Great British Tokenized Deposit (GBTD) initiative involving HSBC and Barclays. Access to the API requires holding QNT tokens.

AI Agent Use Cases

- Cross-chain interoperability connecting multiple blockchains without modifying their code

- API-based integration with traditional financial infrastructure and banking rails

- Smart contract deployment and execution across supported ledgers

- Asset tokenization and issuance across distributed ledgers

- Sandbox environment for development and testing (api.sandbox.overledger.dev)

- Enterprise-grade compliance and security for regulated financial institutions

Available Actions

These are the specific actions that AI agents can perform with this tool

Execute Signed Transaction

3 inputs

Submits a pre-signed blockchain transaction to the network through Overledger for execution.

Inputs

environment

Select the Overledger instance to be used

requestId

The Overledger identifier assigned to the related transaction preparation request. This should be set to the requestId parameter found in the response object of the

signedTransaction

The raw transaction bytecode after signing. This should be set to the signed parameter found in the response object of the

Prepare Smart Contract Transaction

6 inputs

Prepares a smart contract transaction payload ready for signing and submission on the Overledger platform.

Inputs

environment

Select the Overledger instance to be used

locationTechnology

The technology of the blockchain that the transaction will be submitted to

signingAccountId

The blockchain account ID/address that will be sending this transaction

smartContractId

The ID/address of the smart contract to interact with.

functionName

The name of the function to call on the smart contract.

inputParameters

The input parameters for the smart contract function, in JSON format.

Read from a smart contract

6 inputs

Retrieves specified data stored within a smart contract deployed on the Overledger network.

Inputs

environment

Select the Overledger instance to be used

locationTechnology

The technology of the blockchain that the transaction will be submitted to

functionName

The name of the function to call on the smart contract.

inputParameters

The input parameters for the smart contract function, provide both type and value in object format. Example: {\

smartContractId

The ID/address of the smart contract to interact with.

outputParameters

Each output parameter expected, provide just the type in object format. Example - 1) function returns one uint256 value: {\

Sign a transaction

6 inputs

Signs a blockchain transaction payload using Overledger to prepare it for submission.

Inputs

environment

Select the Overledger instance to be used

locationTechnology

The blockchain technology used for this transaction, e.g., ethereum, substrate - required in order to set the dltfee

keyId

The ID/address of the blockchain account that will sign the transaction.

requestId

The Request ID assigned to a preparation request in Overledger. This should be set to the requestId parameter found in the response object of the

transactionSigningResponderName

The name of the Transaction Signing Responder you would like to use. The CTA Transaction Signing Responder is the Quant-provided signer for testnet accounts.

nativeData

An object representing the transaction required to be signed - This should be set to the nativeData object of the

About Overledger

AI Agent Use Cases

- Cross-chain interoperability connecting multiple blockchains without modifying their code

- API-based integration with traditional financial infrastructure and banking rails

- Smart contract deployment and execution across supported ledgers

- Asset tokenization and issuance across distributed ledgers

- Sandbox environment for development and testing (api.sandbox.overledger.dev)

- Enterprise-grade compliance and security for regulated financial institutions

Available Actions

These are the specific actions that AI agents can perform with this tool

Execute Signed Transaction

3 inputs

Submits a pre-signed blockchain transaction to the network through Overledger for execution.

Inputs

environment

Select the Overledger instance to be used

requestId

The Overledger identifier assigned to the related transaction preparation request. This should be set to the requestId parameter found in the response object of the

signedTransaction

The raw transaction bytecode after signing. This should be set to the signed parameter found in the response object of the

Prepare Smart Contract Transaction

6 inputs

Prepares a smart contract transaction payload ready for signing and submission on the Overledger platform.

Inputs

environment

Select the Overledger instance to be used

locationTechnology

The technology of the blockchain that the transaction will be submitted to

signingAccountId

The blockchain account ID/address that will be sending this transaction

smartContractId

The ID/address of the smart contract to interact with.

functionName

The name of the function to call on the smart contract.

inputParameters

The input parameters for the smart contract function, in JSON format.

Read from a smart contract

6 inputs

Retrieves specified data stored within a smart contract deployed on the Overledger network.

Inputs

environment

Select the Overledger instance to be used

locationTechnology

The technology of the blockchain that the transaction will be submitted to

functionName

The name of the function to call on the smart contract.

inputParameters

The input parameters for the smart contract function, provide both type and value in object format. Example: {\

smartContractId

The ID/address of the smart contract to interact with.

outputParameters

Each output parameter expected, provide just the type in object format. Example - 1) function returns one uint256 value: {\

Sign a transaction

6 inputs

Signs a blockchain transaction payload using Overledger to prepare it for submission.

Inputs

environment

Select the Overledger instance to be used

locationTechnology

The blockchain technology used for this transaction, e.g., ethereum, substrate - required in order to set the dltfee

keyId

The ID/address of the blockchain account that will sign the transaction.

requestId

The Request ID assigned to a preparation request in Overledger. This should be set to the requestId parameter found in the response object of the

transactionSigningResponderName

The name of the Transaction Signing Responder you would like to use. The CTA Transaction Signing Responder is the Quant-provided signer for testnet accounts.

nativeData

An object representing the transaction required to be signed - This should be set to the nativeData object of the