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Coins Agent Check — ERC-20 Allowance Snapshot
x402
Coins Agent Check — ERC-20 Allowance Snapshot is a paid API for AI agents from coins.zhidun.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-27).
Returns a signed snapshot of ERC-20 token allowances for a given owner address across one or more spender addresses on Base or BSC
Price / call$0.02
Success—
StatusUnknown
How this service works
USDC receipt evidence for x402 merchants and wallet agents. Try a free public-chain receipt example, then verify your own Base USDC transfers for 0.02 USDC per report.
Output
A JSON object with kind set to 'erc20_allowance_snapshot' and a reportId (private request hash), representing a paid, verifiable snapshot of the current ERC-20 allowances the specified owner has granted to the listed spenders for the given token on the specified chain.
Example use cases
Audit DeFi protocol spend permissions
“Check what allowance my wallet 0xAbC1234567890AbC1234567890AbC1234567890Ab has granted to Uniswap's router at 0xDef9876543210DeF9876543210DeF9876543210De for USDC on Base chain — flag if it's an unlimited approval. I'm in the US and I accept the terms.”
Pre-transfer allowance verification
“Before I trigger an automated USDC transfer, verify that the spender contract 0xDef9876543210DeF9876543210DeF9876543210De has sufficient allowance from owner 0xAbC1234567890AbC1234567890AbC1234567890Ab on BSC (chain 56) for token 0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d. Country is US, terms accepted.”
Security scan for unexpected token approvals
“Scan the ERC-20 allowances that my wallet 0xAbC1234567890AbC1234567890AbC1234567890Ab has set on Base for USDC, checking these three spender addresses: 0xAAA1111111111111111111111111111111111111, 0xBBB2222222222222222222222222222222222222, and 0xCCC3333333333333333333333333333333333333. I want to know if any of them have unexpected permissions. I'm in the US and I accept your terms.”
Technical details
Endpoint
POSThttps://coins.zhidun.ai/api/v1/tokens/allowances?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a cryptographically evidenced, paid snapshot of ERC-20 allowances on Base or BSC — particularly useful for compliance checks, pre-transaction validation, wallet security audits, or when you need a reportId for auditability. Prefer this over free block explorer lookups when you need a structured, agent-consumable result with verified provenance and ABI interpretation included.
Side effects
- Invalid owner/token/spender address format (must be 0x-prefixed 40-hex-char address)
- Unsupported chainId (only 56 for BSC and 8453 for Base are accepted)
- Too many spenders (max 3 allowed)
- termsAccepted not set to true — request rejected
- Missing or invalid customerCountryCode (must be 2-letter ISO country code)
- Payment failure via x402 — report not delivered if 0.02 USDC charge fails
- On-chain RPC errors if the specified token contract does not exist on the given chain
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| token | string | |
| chainId | — | |
| spenders | array | |
| termsAccepted | boolean | |
| customerCountryCode | string |
Output
Schema · Response
{
"type": "json",
"example": {
"kind": "erc20_allowance_snapshot",
"reportId": "private-request-hash"
}
}Tags
x402
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