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GET /v1/chains

Chains Yearn runs on

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/yearn-api

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Code snippets

curl "https://api.oanor.com/yearn-api/v1/chains" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/yearn-api/v1/chains", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/yearn-api/v1/chains");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/yearn-api/v1/chains",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "count": 8,
        "chains": [
            {
                "name": "Ethereum",
                "chain_id": 1
            },
            {
                "name": "Optimism",
                "chain_id": 10
            },
            {
                "name": "Gnosis",
                "chain_id": 100
            },
            {
                "name": "Polygon",
                "chain_id": 137
            },
            {
                "name": "Sonic",
                "chain_id": 146
            },
            {
                "name": "Fantom",
                "chain_id": 250
            },
            {
                "name": "Base",
                "chain_id": 8453
            },
            {
                "name": "Arbitrum",
                "chain_id": 42161
            }
        ],
        "source": "Yearn (yDaemon)"
    },
    "meta": {
        "timestamp": "2026-06-10T22:58:15.907Z",
        "request_id": "4c67b01e-5ddb-4181-9ac5-633f55e8ba89"
    },
    "status": "ok",
    "message": "Chains retrieved successfully",
    "success": true
}