2 credits per API call
Invoke a method in an existing smart contract on Cronos.
You can call a read-only or write method.
- For read-only methods, the output of the invoked method is returned.
- For write methods, the ID of the associated transaction is returned.
Troubleshooting a failed transaction
Tatum ensures that this API works against the blockchain (accesses the blockchain, finds the specified smart contract, and executes the specified ABI method with the provided parameters).
However, because this API can be run against any smart contract on the blockchain, Tatum cannot in any way guarantee that the method itself will be executed successfully.
If you have issues with invoking the method, refer to the user documentation for this method, or contact the author of the smart contract.
For more information about invoking methods in smart contracts, see this article on our Support Portal.
Signing a transaction
When invoking a method in a smart contract, you are charged a fee for the transaction, and you must sign the transaction with the private key of the blockchain address from which the fee will be deducted.
If caller field is present instead of the private key, Tatum will sign the transaction with the managed private key connected to the caller address. This is applicable only for paid mainnet plans and all testnet plans. Keep in mind that the caller address must have enough access right to perform the action in the smart contract method.
Providing the private key in the API is not a secure way of signing transactions, because the private key can be stolen or exposed. Your private keys should never leave your security perimeter. You should use the private keys only for testing a solution you are building on the testnet of a blockchain.
For signing transactions on the mainnet, we strongly recommend that you use the Tatum Key Management System (KMS) and provide the signature ID instead of the private key in the API. Alternatively, you can use the Tatum JavaScript client.