caPay Function

Function Type: external
Function Signature: caPay(address,address,uint256)
Function Selector: 0xc898a6e9

Contract-to-address payment function designed for authorized smart contracts to distribute tokens without signature verification. This function allows registered smart contracts to efficiently transfer tokens using direct balance manipulation, primarily for automated distributions and system payouts.

Key Features

• Contract-Only Execution: Only smart contracts (non-EOA addresses) can call this function, verified via bytecode presence
• No Signature Required: Bypasses signature verification as authorization is implicit through contract execution
• No Nonce Management: Does not use EVVM nonce systems since contracts rely on blockchain transaction nonces
• Automated Distributions: Designed for staking rewards, NameService fees, and other automated system payouts
• Staker Rewards: Contracts that are registered stakers receive principal token rewards for successful transfers

Parameters

Field	Type	Description
to	address	The recipient's address for the token transfer.
token	address	The token address to transfer.
amount	uint256	The quantity of tokens to transfer from the calling contract.

Workflow

1. Contract Verification: Validates that the caller (msg.sender) is a smart contract by checking its bytecode size using extcodesize. Reverts with NotAnCA if the caller is an Externally Owned Account (EOA).

2. Balance Update: Executes the token transfer using the _updateBalance function:

   • Verifies the calling contract has sufficient token balance
   • Debits the amount from the calling contract's balance
   • Credits the amount to the recipient's balance
   • Reverts with UpdateBalanceFailed if the transfer fails

3. Staker Reward: If the calling contract is a registered staker (isAddressStaker(msg.sender)), grants 1 principal token reward using _giveMateReward.