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Plainchain ERC-20 Allowance Lookup
x402
Plainchain ERC-20 Allowance Lookup is a paid API for AI agents from plainchain.appin60.com, paid per call via x402, $0.001042/call, status unknown (last checked 2026-10-14).
Returns the current ERC-20 token allowance (approved spending limit) granted by an owner to a spender on Base, Arbitrum, Ethereum, or Optimism, with a plain-language risk assessment.
Price / call$0.001042
Success—
StatusUnknown
How this service works
Gas, balances, token data, address type, approvals, transaction decoding, x402 receipt verification and verifiable randomness on Base, Arbitrum, Ethereum and Optimism. No API key: pay $0.001-$0.01 per call in USDC on Base via x402.
Output
Returns a JSON object containing: the token symbol, the chain name, the allowance amount (either a numeric string or 'unlimited'), a boolean 'unlimited' flag, and a plain-English 'risk' string explaining what the approval means and whether the user should consider revoking it.
Example use cases
Audit risky unlimited DeFi approvals
“Check whether the Uniswap router at 0xE592427A0AEce92De3Edee1F18E0157C05861564 has unlimited approval to spend USDC (0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48) from my wallet 0xAbCd000000000000000000000000000000001234 on Ethereum — and tell me if I'm at risk.”
Verify Permit2 allowance before swap
“Before I do a swap, can you check the Permit2 contract allowance (0x000000000022D473030F116dDEE9F6B43aC78BA3) for my USDC on Base? My wallet is 0xBeef000000000000000000000000000000005678 and USDC is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.”
Monitor token approval on Arbitrum
“What's the current spending allowance that the GMX router (0xaBBc5F99639c9B6bCb58544ddf04165ad8c4FfE9) has over my ARB tokens (0x912CE59144191C1204E64559FE8253a0e49E6548) from address 0xDead000000000000000000000000000000009999 on Arbitrum?”
Technical details
Endpoint
GEThttps://plainchain.appin60.com/v1/allowance?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to check ERC-20 token approval risk without setting up an API key — paying $0.001 per call in USDC via x402 on Base. Ideal for DeFi security audits, pre-swap approval checks, or wallet hygiene workflows across Base, Arbitrum, Ethereum, and Optimism. Prefer this over general blockchain RPC calls when you want a structured, human-readable risk assessment alongside the raw allowance value.
Side effects
- Invalid Ethereum address format for owner, token, or spender (must be 0x-prefixed 40 hex chars)
- Unsupported chain identifier returns an error
- Token address is not a valid ERC-20 contract (e.g. native ETH address)
- Payment failure via x402 if USDC balance or approval on Base is insufficient
- Network/RPC timeout for the queried chain
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"risk": "Spender can move the owner's entire balance of this token at any time. Revoke if you no longer use it.",
"chain": "Base",
"symbol": "USDC",
"allowance": "unlimited",
"unlimited": true
}
}Tags
x402
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