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VM5 Base USDC Allowance Snapshot (x402 micropayment)
x402
VM5 Base USDC Allowance Snapshot (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).
Returns a read-only snapshot of a USDC token allowance on Base (chain 8453), showing owner balance, spender allowance, and block number, delivered via x402 micropayment.
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
A JSON object containing: whether the call succeeded, the kind of snapshot, chain ID (8453), network identifier (eip155:8453), charged USDC amount, owner address, current USDC allowance for the spender, USDC token contract address, spender address, owner's current USDC balance, observed block number, a flag indicating only read methods were called, a flag for unlimited (max uint256) approval, and a warning if the data is a fictitious example.
Example use cases
Pre-transaction allowance check
“Before I submit this DeFi swap, can you check whether the spender contract 0x2222222222222222222222222222222222222222 already has enough USDC allowance from my wallet 0x1111111111111111111111111111111111111111 on Base mainnet?”
Unlimited approval audit
“I want to audit my wallet 0x1111111111111111111111111111111111111111 — can you check if I've accidentally granted unlimited USDC approval to 0x2222222222222222222222222222222222222222 on Base chain and what my current balance is?”
DeFi protocol onboarding verification
“We're onboarding users to our Base DeFi app and need to verify that a user's wallet 0x1111111111111111111111111111111111111111 has approved our contract 0x2222222222222222222222222222222222222222 for at least 50 USDC — can you pull the current allowance snapshot from Base?”
Technical details
Endpoint
GEThttps://vm5-openapi-x402.onrender.com/v1/base-usdc-allowance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, on-demand, paid read-only snapshot of a Circle USDC token allowance on Base (chain 8453) without running your own RPC node. It is especially suited for agents that need a quick pre-transaction allowance check or approval audit and can pay micro-fees ($0.01 USDC) via the x402 protocol. Prefer alternatives if you need batch allowance checks, historical data, or non-USDC tokens.
Side effects
- Invalid or missing owner/spender address returns an error response
- Endpoint may return a fictitious example payload if not a live paid call (fictitiousExampleWarning flag set)
- Payment failure via x402 protocol blocks data delivery
- Network unavailability on Render.com hosting causes 5xx errors
- Base chain RPC node issues may result in stale or unavailable block data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"kind": "base_native_circle_usdc_readonly_allowance_snapshot",
"paid": true,
"chainId": 8453,
"network": "eip155:8453",
"chargedUSDC": "0.01",
"exampleOnly": true,
"ownerAddress": "0x1111111111111111111111111111111111111111",
"allowanceUSDC": "100.000000",
"tokenContract": "0x833589fCD6eDb6E08f4C7C32D4f71b54bdA02913",
"spenderAddress": "0x2222222222222222222222222222222222222222",
"ownerBalanceUSDC": "1.150000",
"observedBlockNumber": 53029536,
"calledOnlyReadMethods": true,
"isUnlimitedMaxUint256": false,
"fictitiousExampleWarning": "This is a fully fictitious example, NOT a current allowance or actual paid x402 delivery.",
"independentPaidBuyersVerified": 0,
"allowanceExceedsCurrentBalance": true
}
}Tags
x402
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