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CoinOpSelect Contract Permissions Query
x402
CoinOpSelect Contract Permissions Query is a paid API for AI agents from coinop.publicvm.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).
Looks up ERC-20 token allowance and permission data for a given contract, owner, and spender address on Base
Price / call$0.01
Success—
StatusUnknown
How this service works
Paid on-chain token, wallet, contract and research data over x402 on Base.
Output
Returns a JSON object containing the allowance value (or null), a permissions array, flags array, owner and spender addresses, the queried contract address, chainId (8453 for Base), network name, whether data came from cache, and a generatedAt timestamp.
Example use cases
DeFi protocol approval audit
“What's the current token allowance that the Uniswap router at 0x2626664c2603336E57B271c5C0b26F421741e481 has over my wallet 0xYourWallet for the USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base?”
Security check before token revoke
“I think I may have approved a sketchy contract to spend my tokens — can you check the permissions and allowance that spender 0xSuspect...789 has on the WETH contract 0x4200000000000000000000000000000000000006 for my address 0xMyWallet...001 on Base?”
Agent wallet permission verification
“Before executing this DeFi strategy, verify whether the agent wallet 0xAgent...555 already has an ERC-20 allowance from 0xUser...999 on the DAI contract 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb on Base so we know if we need to send an approval transaction first.”
Technical details
Endpoint
GEThttps://coinop.publicvm.com/api/v1/query/contract-permissions?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to check ERC-20 token spending permissions or allowances on the Base network without running your own RPC node. It is ideal for AI agents performing pre-flight checks before DeFi transactions, auditing wallet approvals, or verifying that a spender contract is authorized. Prefer this over generic blockchain RPCs when you want a structured, parsed response rather than raw contract call output, and when operating on Base mainnet specifically.
Side effects
- Invalid or malformed contract/owner/spender address returns an error or empty result
- Contract address is not an ERC-20 token — allowance field may be null and permissions empty
- Network outage or RPC node failure on Base could cause request timeout
- Missing required 'contract' query parameter results in a validation error
- Non-Base contract addresses (e.g. Ethereum mainnet) will not return valid data as the service is scoped to Base (chainId 8453)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"flags": [],
"owner": "0x..",
"query": "0x..",
"chainId": 8453,
"network": "base",
"spender": "0x..",
"contract": "0x..",
"allowance": null,
"fromCache": false,
"generatedAt": "2026-01-01T00:00:00.000Z",
"permissions": []
}
}Tags
x402
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