Слой рыночной аналитики для крипто доходности

// GET /api/v1/rates/BTC?category=lending
{
  "data": {
    "symbol": "BTC",
    "rates": [
      {
        "provider": "aave-v3",
        "symbol": "BTC",
        "category": "lending",
        "rate": 0.0034536,
        "metadata": {
          "mode": "aave_liquidity_rate",
          "method": "getReserveData",
          "source": "onchain_rate",
          "chainId": 1,
          "contract": "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2"
        },
        "lastUpdated": "2026-09-21T05:31:45.650Z",
        "coinId": "bitcoin",
        "providerSymbol": "BTC",
        "unitType": "percentage",
        "unitSymbol": "%",
        "ageSeconds": 47,
        "stale": false
      },
      {
        "provider": "euler-v2",
        "symbol": "BTC",
        "category": "lending",
        "rate": 0.03886769,
        "metadata": {
          "headline": {
            "apy": 0.038867686,
            "name": "eWBTC-3",
            "tvlUsd": 547560.7017081856
          },
          "variants": [
            {
              "apy": 0.038867686,
              "name": "eWBTC-3",
              "tvlUsd": 547560.7017081856
            }
          ],
          "truncated": false,
          "variantCount": 1
        },
        "lastUpdated": "2026-09-21T05:30:59.452Z",
        "coinId": "bitcoin",
        "providerSymbol": "WBTC",
        "unitType": "percentage",
        "unitSymbol": "%",
        "ageSeconds": 94,
        "stale": false
      },
      {
        "provider": "bitfinex",
        "symbol": "BTC",
        "category": "lending",
        "rate": 0.001,
        "metadata": null,
        "lastUpdated": "2026-09-21T05:30:55.346Z",
        "coinId": "bitcoin",
        "providerSymbol": "BTC",
        "unitType": "percentage",
        "unitSymbol": "%",
        "ageSeconds": 98,
        "stale": false
      }
    ],
    "count": 12
  }
}