# Idle USDC Yield Scout

> Idle USDC Yield Scout is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Fetches live USDC supply rates from Base money markets (Aave v3, Moonwell) and returns the best current yield, optionally projecting annual earnings on a given balance.

## Facts

- Endpoint: GET https://402.com.tr/api/x402/yield-scout?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/idle-usdc-yield-scout-ae1f595f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZsTI8hnYPbo89_IfxOvxV

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 idle-usdc-yield-scout-ae1f595f
```

Example prompt: I have 5000 USDC sitting idle in my wallet on Base — can you check which money market (Aave v3 or Moonwell) is paying the best rate right now and show me what I'd earn annually?

## When to prefer this

Use this endpoint when an AI agent needs to make real-time yield comparisons across Base L2 money markets specifically for USDC, reading directly from on-chain protocol state rather than a third-party data feed. Ideal for pre-deposit decisions, treasury management bots, and gas-vs-yield trade-off calculations. Not suitable for non-USDC assets, non-Base chains, or historical rate queries.

## Known failure modes

- One or more protocols unreachable — excluded from 'best' result and flagged in response
- No venues readable — no best rate returned
- Invalid or non-numeric amount parameter — projection skipped or error returned
- Rate is stale due to block timing — noted as variable, changes every block

## How this service works

Every pre-funded agent wallet carries idle USDC that earns nothing. This reads the live USDC supply rate across Base money markets (Aave v3, Moonwell) straight from each protocol — not a feed — and returns the best, with the annual yield on your balance so you can weigh moving against the gas. Rates are variable and change every block; a venue it could not read is excluded from 'best', never sent funds on an unconfirmed rate. Pass amount= for the yield projection. Not financial advice.

## Output

Returns the best current USDC supply rate found across Base money markets (Aave v3, Moonwell), the winning venue/protocol name, the APY, and — if an amount was provided — the projected annual yield in USDC. Venues that could not be read are excluded from the result and noted separately.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "amount": {
       "type": "string",
       "description": "Idle USDC balance (optional, for projection)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/idle-usdc-yield-scout-ae1f595f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402.com.tr](https://www.zero.xyz/host/402.com.tr/llms.txt)