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Wallet Approval Audit Base
x402
Wallet Approval Audit Base is a paid API for AI agents from ari001.tailb4ac3a.ts.net, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Returns the current ERC-20 token allowance a spender holds over an owner's wallet on the Base network by calling allowance(owner, spender) on the token contract.
Price / call$0.003
Success—
StatusUnknown
How this service works
Base ERC-20 approval check: returns the current allowance a spender holds over an owner's tokens, read live via allowance(owner, spender) on the token contract on Base. Takes token (0x + 40 hex), owner (0x + 40 hex), spender (0x + 40 hex). Query: token (ERC-20 contract, 0x + 40 hex), owner (0x + 40 hex), spender (0x + 40 hex).
Output
Returns a JSON object with ok (boolean), result (the allowance as a uint256 decimal string — e.g. '115792089237316195423570985008687907853269984665640564039457584007913129639935' for unlimited approval or '0' if revoked), chain (e.g. 'base'), method, service name, and an error string if the call failed.
Example use cases
DeFi approval security audit
“Check if the Uniswap router at 0x4752ba5DBc23f44D87826276BF6Fd6b1C372aD24 has any approval to spend my USDC tokens at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — my wallet is 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base.”
Pre-swap allowance verification
“Before I submit this swap, can you verify that the Base DEX contract 0x2626664c2603336E57B271c5C0b26F421741e481 is approved to spend at least 500 USDT (token 0xfde4C96c8593536E31F229EA8f37b2ADa2699bb2) from my wallet 0xAbCdEf1234567890AbCdEf1234567890AbCdEf12?”
Revoke candidate discovery
“I want to know the current allowance that the contract 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD has over my DAI tokens at 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb, with my owner address being 0x1234567890abcdef1234567890abcdef12345678 on Base — I'm trying to figure out if I need to revoke it.”
Technical details
Endpoint
GEThttps://ari001.tailb4ac3a.ts.net/v1/ventures/ethereum_contract_abi_service/wallet_approval_audit_base?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a live, on-chain read of an ERC-20 token allowance specifically on the Base network. It is ideal for wallet security audits, pre-transaction approval checks, or DeFi permission monitoring on Base. Prefer it over generic Ethereum mainnet allowance checkers when the user's tokens and contracts are on Base (chain ID 8453).
Side effects
- Invalid address format (not 0x + 40 hex) returns a validation error
- Token contract address that is not a valid ERC-20 returns an error or zero
- Network/RPC timeout causes ok=false with an error message
- Non-existent contract address returns zero allowance or an error
- Missing required query parameters (token, owner, or spender) causes a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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