Vextorium EVM Token Approval Revoke

x402

Vextorium EVM Token Approval Revoke is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-19).

Generates calldata to revoke (zero-out) an ERC-20 token approval for a specified spender on EVM chains

Price / call$0.003

Seller volume →—

Success—

StatusUnknown

How this service works

Build the transaction that revokes a contract's permission over an ERC-20 token (approve(spender, 0)): target and calldata ready to sign in your wallet. Nothing is sent.

Output

Returns a JSON object containing: the token contract address (for), raw hex-encoded calldata (data) for an approve(address,uint256) call with amount set to zero, the ETH value to send (value, typically '0'), the function signature (function), decoded arguments array, and a human-readable note instructing the user to sign and send the transaction from the wallet that originally granted the allowance.

Example use cases

Revoking DEX router approval

“I want to revoke the USDC spending approval I gave to the Uniswap v3 router — the token is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and the spender is 0x2626664c2603336E57B271c5C0b26F421741e481. Give me the calldata to sign and send.”

Cleaning up stale DeFi allowances

“I need to zero out the allowance for token 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 that I granted to the old Aave v2 pool contract at 0x7d2768dE32b0b80b7a3454c06BdAc94A69DDc7A9 — can you build me the revoke transaction?”

Post-exploit emergency approval revoke

“I think my wallet was compromised — please generate the transaction data to revoke the WETH approval I gave to 0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F using token contract 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 so I can broadcast it immediately.”

Technical details

Endpoint

POSThttps://api.vextorium.com/v1/revoke-approval?utm_source=zero.xyz

When to prefer

Use this endpoint when you need to programmatically generate ERC-20 approval revocation calldata for an EVM wallet without connecting directly to a node. It is ideal for AI agents that need to produce ready-to-sign transaction data for revoking allowances across any ERC-20 token and spender pair, especially as part of a DeFi security workflow or post-incident response where speed matters. Pay-per-call via USDC/x402 makes it suitable for agent pipelines without subscription overhead.

Side effects

Invalid or malformed token address returns an error
Invalid or malformed spender address returns an error
Unsupported token contract may return null or error data
Network connectivity issues may cause request timeout
Missing required fields (token or spender) will fail schema validation

Input

Schema · Request body

Field	Type	Description
token	string
spender	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "for": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "data": "0x095ea7b30000000000000000000000002626664c2603336e57b271c5c0b26f421741e4810000000000000000000000000000000000000000000000000000000000000000",
    "note": "Sign and send this transaction from the wallet that granted the allowance.",
    "value": "0",
    "function": "approve(address,uint256)",
    "arguments": [
      "0x2626664c2603336E57B271c5C0b26F421741e481",
      "0"
    ]
  }
}

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