# YieldSignal WETH Base Sensitivity

> YieldSignal WETH Base 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 how close WETH lending on Base is to the interest rate kink point where borrow rates spike, with per-protocol utilization data from Aave and Compound.

## Facts

- Endpoint: GET https://yieldsignal.vercel.app/sensitivity/weth-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-weth-base-sensitivity-581be3e0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qHhiqgucsjgQV2QyddlSu

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-weth-base-sensitivity-581be3e0
```

Example prompt: Check how close WETH lending on Base is to the rate kink right now — I want to know the utilization level and how much headroom is left before borrow rates explode on Aave and Compound.

## When to prefer this

Use this endpoint when you need to assess interest rate kink proximity specifically for WETH lending on Base (not USDC, not Ethereum mainnet). It is the right choice when you want to know whether borrow rates are about to spike before entering or exiting a WETH lending position, or when building automated monitoring for rate explosion risk on Base Layer 2.

## Known failure modes

- On-chain RPC read failure may return stale or unavailable data for one or more protocols
- Protocols without a readable curve are marked unmeasured rather than returning an error
- Payment not received results in 402 response blocking data delivery
- Network congestion on Base may delay real-time reads

## How this service works

How close WETH lending on Base is to the kink where borrow rates explode — same contract as the USDC sensitivity route. Aave and Compound only; protocols without a readable curve 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

Returns per-protocol utilization rates for WETH lending on Base (Aave and Compound), the distance to the kink point where borrow rates accelerate sharply, and a sensitivity reading. Protocols without a readable interest rate curve are marked as unmeasured rather than assumed stable. The response describes current on-chain state, 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-weth-base-sensitivity-581be3e0/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)