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VM5 ERC20 Calldata Preflight — x402 Micropayment
x402
VM5 ERC20 Calldata Preflight — x402 Micropayment 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).
Validates and decodes ERC20 token approval calldata (e.g. approve() calls) as a preflight check, flagging unlimited allowances and unknown token contracts before on-chain execution.
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 ok status, decoded method name (e.g. 'approve'), spender address, atomic allowance amount, network chain ID (e.g. eip155:8453 for Base), 4-byte selector, warning count, flags for unlimited allowance and whether the token contract is known, and the USDC charge amount. No wallet or blockchain interaction occurs server-side.
Example use cases
Detect unlimited token allowance
“I've got this ERC20 approve() calldata and I want to know if it's granting an unlimited allowance to someone — can you decode it and warn me if the spender amount looks suspicious?”
Pre-sign safety audit for DeFi interaction
“Before my agent submits this ERC20 token approval on Base, run a preflight check to decode the calldata and tell me the spender address, the allowance amount, and how many warnings come back.”
Unknown token contract risk check
“Can you analyze this ERC20 calldata and tell me whether the token contract is recognized and whether I should be worried about who's being approved to spend my tokens?”
Technical details
Endpoint
GEThttps://vm5-openapi-x402.onrender.com/v1/erc20-calldata-preflight?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, paid-per-call preflight safety check on ERC20 approve() calldata before signing or broadcasting, specifically on Base (eip155:8453). Useful for AI agents managing wallets that need to programmatically screen token approvals for unlimited allowances or unrecognized token contracts without executing any on-chain transaction themselves.
Side effects
- Invalid or malformed calldata input returns an error or non-ok response
- Unknown or unsupported ERC20 method selectors may not decode correctly
- Payment failure via x402 protocol results in 402 response and no analysis
- Network unavailability on Render.com causes service downtime
- Missing required properties field results in incomplete analysis
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"kind": "evm_erc20_unsigned_calldata_preflight",
"paid": true,
"method": "approve",
"decoded": {
"spender": "0x000000000000000000000000000000000000dead",
"amountAtomic": "115792089237316195423570985008687907853269984665640564039457584007913129639935"
},
"network": "eip155:8453",
"selector": "0x095ea7b3",
"chargedUSDC": "0.01",
"exampleOnly": true,
"warningCount": 1,
"allowanceUnlimited": true,
"tokenContractKnown": false,
"noWalletOrBlockchainUsed": true
}
}Tags
x402
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