# VM5 Base USDC Allowance Snapshot (x402 micropayment)

> 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.

## Facts

- Endpoint: GET https://vm5-openapi-x402.onrender.com/v1/base-usdc-allowance?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vm5-base-usdc-allowance-snapshot-x402-micropayment-547d6abe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4h7eQes6QkNJxPTNQeYkm

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability vm5-base-usdc-allowance-snapshot-x402-micropayment-547d6abe
```

Example prompt: Can you check the current Circle USDC allowance on Base mainnet for owner address 0x1111...1111 and spender 0x2222...2222? I want to see the balance, approved allowance, and which block that was observed at.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vm5-base-usdc-allowance-snapshot-x402-micropayment-547d6abe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vm5-openapi-x402.onrender.com](https://www.zero.xyz/host/vm5-openapi-x402.onrender.com/llms.txt)