Approval limits are the maximum token amounts that a wallet owner authorises a smart contract to transfer on their behalf through the token contract’s allowance mechanism. These limits are set through a separate approval transaction before any contract interaction involving token transfers can proceed. The contract may only move tokens up to the approved amount, with any transfer attempt exceeding the current allowance rejected by the token contract without executing the requested movement from the wallet. https://crypto.games/ approval limits define the ceiling of token access granted to gaming contracts at any point in time. The limit set during the approval transaction directly determines the maximum exposure of the wallet’s token balance to contract-initiated transfers across every subsequent interaction until the allowance is consumed, updated, or revoked by the wallet owner through a dedicated transaction.
What limit structures apply?
Approval limit structures vary in scope, each producing a distinct security profile for the approving wallet.
- Exact amount approvals – The wallet owner sets an allowance equal to the precise token amount required for a single interaction. The contract consumes the full allowance in one transaction, requiring a new approval before the contract can initiate further transfers from the wallet address on subsequent interactions.
- Session-based approvals – A session approval covers the expected token volume for a defined interaction period. The allowance is set above the single transaction requirement but below the wallet’s full balance, limiting contract access to the session volume without requiring a new approval for each individual transaction within the session period.
- Unlimited approvals – An unlimited approval grants the contract unrestricted access to the wallet’s full token balance of the approved type. This structure removes the need for repeated approval transactions but grants the contract persistent transfer access regardless of the interaction volume at any subsequent point in time.
- Time-locked approvals – Certain contract implementations support approval structures that expire after a defined block height or timestamp condition. Once the expiry condition is met, the contract’s transfer access is removed without requiring a manual revocation transaction from the wallet owner at that point.
Revocation allowance management
Approval revocation sets the contract’s allowance for a specific token back to zero through a dedicated transaction submitted by the wallet owner. Revocation takes effect when the transaction is confirmed, immediately preventing the contract from initiating further transfers for the revoked token type across subsequent interactions on the platform.
Partial allowance reduction sets the approved amount to a specific non-zero value rather than zero, capping further contract access without fully removing transfer permissions from the contract address. This approach allows wallet owners to reduce a contract’s remaining allowance after a portion has been consumed, aligning the remaining approval with the expected volume of future interactions rather than maintaining the original approval ceiling indefinitely.
Allowance tracking allows wallet owners to view all active approvals across every contract holding a non-zero allowance for tokens in their wallet. Regular review of active allowances ensures that contracts no longer in active use do not retain transfer access to wallet balances beyond the interaction period for which the approval was originally granted.
Approval limits affect contract interaction security by defining the token access ceiling granted to gaming contracts at every stage of platform interaction. Limit structure selection, revocation management, and platform approval architecture collectively determine how precisely wallet token access is controlled across each contract interaction cycle.
