# YieldSignal USDC/Base Kink Sensitivity

> YieldSignal USDC/Base Kink Sensitivity is a paid API for AI agents from yieldsignal.vercel.app, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-28).

Returns per-protocol utilization, kink thresholds, headroom in basis points, and borrow APY around the kink for USDC lending on Base (Aave and Compound only)

## Facts

- Endpoint: GET https://yieldsignal.vercel.app/sensitivity/usdc-base-yield?utm_source=zero.xyz
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/yieldsignal-usdc-base-kink-sensitivity-fea3807b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a8q2AuH-86kKL4hQJERm0

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 yieldsignal-usdc-base-kink-sensitivity-fea3807b
```

Example prompt: How close is USDC lending on Base to the kink where borrow rates explode? I want to see per-protocol utilization, how many basis points of headroom remain, and what the borrow APY looks like around that kink for Aave and Compound.

## When to prefer this

Use this endpoint when you specifically need to assess kink proximity and rate curve headroom for USDC lending on Base across Aave and Compound. Prefer it over general yield endpoints when your concern is borrow rate spike risk rather than raw APY ranking. Not suitable when you need Morpho data or forecasts; use sibling endpoints for WETH sensitivity or exit capacity analysis.

## Known failure modes

- Protocol data unavailable if on-chain RPC is unreachable
- Morpho always returned as unmeasured — not a failure but an expected limitation
- Payment not processed returns 402
- Rate data may lag a block or two behind real-time on-chain state

## How this service works

How close USDC lending on Base is to the kink where borrow rates explode: per-protocol utilization, the kink read from the protocol's own rate curve, headroom in bps, and borrow APY at points around it. Aave and Compound only — Morpho's adaptive IRM has no static curve and DefiLlama-sourced protocols expose none, so they are marked unmeasured, never assumed stable. Describes state, not a forecast. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at /track-record.

## Output

A structured response containing per-protocol utilization rates, the kink threshold read from each protocol's on-chain rate curve, headroom expressed in basis points, and borrow APY sampled at points around the kink. Aave and Compound are fully measured; Morpho is marked unmeasured due to its adaptive IRM lacking a static curve. Describes current on-chain state only, not a forecast.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/yieldsignal-usdc-base-kink-sensitivity-fea3807b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from yieldsignal.vercel.app](https://www.zero.xyz/host/yieldsignal.vercel.app/llms.txt)