api402x.com

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "what": "Measures an Aave V3 position's exposure to a risk Aave's own health factor structurally cannot show. Aave prices wstETH as (wstETH/stETH rate) x (ETH/USD) with stETH pinned to ETH at exactly 1:1, so a stETH secondary-market depeg does not move the published health factor at all. This route reads the position, independently recomputes the health factor from per-asset collateral, debt and liquidation thresholds (including any e-mode override), verifies that recomputation reproduces Aave's own number, and then answers the question Aave does not: at what stETH depeg does this position reach liquidation. Why pay instead of reading it yourself: getUserAccountData alone cannot answer it -- the aggregate hides which assets back the position -- and a naive recompute that ignores e-mode or the collateral flags produces a confidently wrong number. Positions holding no wstETH are reported as not exposed rather than forced into a score. Required query parameters: chain and borrower.",
  "asset": "USDC",
  "error": "payment_required",
  "price": "$0.005",
  "accepts": [
    {
      "payTo": "0x63bc58472a8449eDd1d1af0B0c03cFc7c832Da2f",
      "price": "$0.005",
      "scheme": "exact",
      "network": "eip155:8453"
    },
    {
      "payTo": "0x63bc58472a8449eDd1d1af0B0c03cFc7c832Da2f",
      "price": {
        "asset": "0xfde4C96c8593536E31F229ea8F37b2Ada2699bb2",
        "extra": {
          "assetTransferMethod": "permit2"
        },
        "amount": "5000"
      },
      "scheme": "exact",
      "network": "eip155:8453"
    },
    {
      "payTo": "0x63bc58472a8449eDd1d1af0B0c03cFc7c832Da2f",
      "price": {
        "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
        "extra": {
          "supportsEip2612": true,
          "assetTransferMethod": "permit2"
        },
        "amount": "5000000000000000"
      },
      "scheme": "exact",
      "network": "eip155:8453"
    }
  ],
  "example": "https://api402x.com/lending-depeg-exposure?chain=ethereum&borrower=0x1C1795bffeDa25De01A7C21c88b49D9592B0598D",
  "network": "eip155:8453",
  "openapi": "https://api402x.com/openapi.json",
  "how_to_pay": "x402: signed payment challenge is in the `payment-required` response header. No API key and no subscription — pay per call in USDC on Base.",
  "x402Version": 2,
  "free_preview": "https://api402x.com/lending-depeg-exposure/preview",
  "authoritative": "payment-required header; this body is a duplicate for clients that read the body",
  "response_schema": "https://api402x.com/openapi.json — the full JSON Schema for this response. It is not repeated in the payment-required header because response headers have a hard 16 KB limit in common HTTP clients and this response is large. The header still carries a complete worked example of the shape."
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xE606AE66542D4F1A56AA551841db41e3ECd26816",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog

2026-08-14 23:30Z

Last indexed by Roundhouse

2026-09-21 14:45Z

Last enriched (probe, favicon, geo)

2026-09-16 05:15Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 402