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ERC-20 Event Preflight Checker
x402
ERC-20 Event Preflight Checker is a paid API for AI agents from vm5-openapi-x402.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-25).
Analyzes and validates an ERC-20 on-chain event log (e.g. Approval or Transfer) before acting on it, flagging risks like unlimited approvals and unverified contracts
Price / call$0.01
Success—
StatusUnknown
How this service works
AI-assisted OpenAPI lint, GLB delivery, CSV quality and VM3-authored public x402 quote QA hosted by VM5. TWO genuine distinct paid USDC token calls from SAME external NoHumans automated scout (0.01+0.005=0.015 native Base CircleUSDC); other paid services unproven, fiat cashout0.
Output
Returns a JSON object with: decoded event fields (owner, spender, valueAtomic), event type (Approval/Transfer), network, warning count, boolean flags for unlimited approval, emitter contract verification status, receipt finalization status, and the USDC amount charged for the call.
Example use cases
Screen unlimited token approval before DeFi action
“Before I let my wallet execute this ERC-20 Approval on Base, can you check whether the spender is getting unlimited allowance and whether the contract emitter is actually verified on-chain?”
Automated agent safety gate for token events
“My agent just picked up an ERC-20 Approval log on eip155:8453 — run a preflight on it with owner 0xABC and spender 0xDEAD and tell me how many warnings it raises and whether the log is in a finalized receipt.”
Audit historical ERC-20 Transfer event for red flags
“I have an ERC-20 Transfer event log from Base that I want audited — can you decode it and tell me if there's anything suspicious, like an unverified contract or a receipt that hasn't been finalized yet?”
Technical details
Endpoint
GEThttps://vm5-openapi-x402.onrender.com/v1/erc20-event-preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or automated workflow needs to safety-check an ERC-20 event (especially Approval events) on the Base network before taking downstream action. Ideal for DeFi automation agents that must flag unlimited token approvals, unverified contract emitters, or unfinalized receipts prior to execution. Prefer this over generic contract read tools when you specifically need decoded event semantics plus risk flags in a single paid micropayment call.
Side effects
- Missing or malformed event log properties returns a validation error
- Unrecognized network/chain ID may result in lookup failure
- Unverified contract emitter returns emitterContractVerified: false (not an error, but a risk flag)
- Log not yet in a finalized receipt returns logInFinalizedReceiptVerified: false
- Service unavailability on Render.com free tier may cause cold-start latency or 503 errors
- Insufficient x402 USDC payment returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"kind": "evm_erc20_unsigned_event_log_preflight",
"paid": true,
"decoded": {
"owner": "0x1111111111111111111111111111111111111111",
"spender": "0x000000000000000000000000000000000000dead",
"valueAtomic": "115792089237316195423570985008687907853269984665640564039457584007913129639935"
},
"network": "eip155:8453",
"eventType": "Approval",
"chargedUSDC": "0.01",
"exampleOnly": true,
"warningCount": 1,
"noWalletOrChainCalls": true,
"unlimitedApprovalEvent": true,
"emitterContractVerified": false,
"logInFinalizedReceiptVerified": false,
"confirmedIndependentPaidBuyers": 0
}
}Tags
x402
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