No allowance
The entered allowance is zero. Confirm the on-chain value at the required block before treating exposure as closed.
TOKEN ALLOWANCE RISK CHECKER.
Compare an existing allowance with intended use, validate spender format and expose surplus approval without connecting or signing.
Approval exposure model
Runs in this browser. No wallet, account, signature or transaction.
How Approval exposure model works
The checker validates a pasted spender address and compares a manually verified token allowance with the intended spend. It reports surplus exposure, allowance multiple and an optional value estimate. It never reads a wallet, verifies spender identity, revokes approval or asks for a signature. Review contract and proxy control risk to inspect the documented rule and its evidence boundary in more detail.
Approval exposure model equation
surplus allowance = approved amount − intended spend; allowance multiple = approved amount ÷ intended spend; value exposure = allowance × optional token priceApproval exposure model example
An allowance of 1,000,000 tokens for an intended 10,000-token action leaves 990,000 tokens of surplus approval and is 100 times the intended spend. That is exposure to investigate, not proof of malicious intent. Learn to inspect BNB Chain records before treating the modeled output as present contract behavior.
Approval exposure screen
Owner
The wallet whose token contract allowance is being reviewed.
Spender
The complete address authorized to call transferFrom.
Allowance
The maximum remaining amount, not proof that it has been spent.
APPROVAL IS AUTHORITY.
NOT A TOKEN TRANSFER.
An allowance grants a spender contract permission to move tokens later under transferFrom. The checker measures how far that permission exceeds one intended action while leaving spender identity and code analysis explicit.
Bounded approval
The allowance is no larger than intended spend. Contract identity and the transaction still require verification.
Moderate surplus
The allowance is above the action but no more than five times its size. Explain why reuse is necessary.
Elevated surplus
The allowance exceeds five times intended spend. The tool flags exposure without alleging malicious intent.
The spender is the security boundary
A familiar token address does not make an unknown spender safe. Verify all 42 spender characters, inspect whether it is a proxy, identify its implementation and administrator, and decode the exact method the interface requests.
Allowance value is also stateful. An approval can be partly consumed, replaced or revoked. Use the current allowance(owner, spender) result rather than assuming the original approval amount remains available.
CHECK BEFORE APPROVING.
CHECK AGAIN AFTER USE.
- 01
Read the current allowance
Query the correct token with owner and spender addresses. Record block, raw integer and decimals before converting units.
- 02
Identify the spender
Match the complete address to the intended application. Inspect implementation and control if it is upgradeable.
- 03
Compare with immediate need
Use this checker to quantify surplus. Prefer the narrowest approval supported by the workflow and verify the transaction preview.
- 04
Confirm post-action state
After use or revocation, wait for confirmation and read allowance again. A submitted transaction is not the same as changed state.
FindingImmediate questionEvidence to retainResearch conclusion
Unexpected spender
Which interface or transaction created it?
Approval transaction, calldata and spender code.
Unexplained authority requiring investigation.
Large surplus
Does the workflow require reuse?
Intended spend and application documentation.
Exposure larger than immediate operational need.
Revocation confirmed
Does allowance now read zero?
Successful receipt and post-block allowance call.
Future transferFrom authority removed at that observed state.
Continue with spender evidence
The proxy guide explains mutable spender code. The BscScan guide shows how to preserve approvals, receipts and state observations.
TOKEN ALLOWANCE RISK CHECKER FAQ.
Answers about approval exposure model, its inputs and the evidence limits specific to this result.
01Does this checker connect to my wallet?
No. All fields are manual and processed in the browser. The page cannot discover, create or revoke an allowance.
02Is a large allowance automatically malicious?
No. Some applications request reusable approvals. The size increases potential exposure if the spender is compromised, upgraded or used beyond the intended action.
03What does unlimited approval mean?
Interfaces often use an extremely large uint256 allowance to avoid repeat approvals. Treat any effectively unbounded value as materially larger than the intended spend.
04Does revoking an allowance recover transferred tokens?
No. Revocation can restrict future transferFrom calls after confirmation, but it does not reverse completed transfers.
05What else should I verify about the spender?
Check the full address, deployed bytecode, proxy implementation, administrator, application source, requested method and whether a narrower approval is supported.
NEXT CHECKS FOR
APPROVAL EXPOSURE MODEL.
Continue from approval exposure model with the three adjacent checks most relevant to its assumptions and unresolved evidence.
What the Token Allowance Risk Checker proves - And what it cannot
Read these relationships alongside the documented assumptions for approval exposure model. Together, the Token Allowance Risk Checker relationships identify what its result measures and which evidence remains unresolved.
A token allowance
authorizesa spender contract to transfer up to a specified amount
Surplus approval
exceedsthe amount intended for the immediate action
The allowance risk checker
never requestsa wallet connection, approval or signature