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GET /v1/chains

All supported chains

Try it live

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

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

It works. Grab an API key and use it in your project.

Get an API key

Code snippets

curl "https://api.oanor.com/across-api/v1/chains" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/across-api/v1/chains", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/across-api/v1/chains");
curl_setopt($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/across-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": 24,
        "chains": [
            {
                "name": "Ethereum",
                "chain_id": 1
            },
            {
                "name": "Optimism",
                "chain_id": 10
            },
            {
                "name": "BNB Chain",
                "chain_id": 56
            },
            {
                "name": "Unichain",
                "chain_id": 130
            },
            {
                "name": "Polygon",
                "chain_id": 137
            },
            {
                "name": "Chain 143",
                "chain_id": 143
            },
            {
                "name": "Chain 232",
                "chain_id": 232
            },
            {
                "name": "zkSync Era",
                "chain_id": 324
            },
            {
                "name": "World Chain",
                "chain_id": 480
            },
            {
                "name": "Chain 999",
                "chain_id": 999
            },
            {
                "name": "Lisk",
                "chain_id": 1135
            },
            {
                "name": "Soneium",
                "chain_id": 1868
            },
            {
                "name": "Chain 4217",
                "chain_id": 4217
            },
            {
                "name": "Chain 4326",
                "chain_id": 4326
            },
            {
                "name": "Base",
                "chain_id": 8453
            },
            {
                "name": "Chain 9745",
                "chain_id": 9745
            },
            {
                "name": "Mode",
                "chain_id": 34443
            },
            {
                "name": "Arbitrum",
                "chain_id": 42161
            },
            {
                "name": "Ink",
                "chain_id": 57073
            },
            {
                "name": "Linea",
                "chain_id": 59144
            },
            {
                "name": "Blast",
                "chain_id": 81457
            },
            {
                "name": "Zora",
                "chain_id": 7777777
            },
            {
                "name": "Chain 728126428",
                "chain_id": 728126428
            },
            {
                "name": "Chain 34268394551451",
                "chain_id": 34268394551451
            }
        ],
        "source": "Across"
    },
    "meta": {
        "timestamp": "2026-06-10T22:57:03.964Z",
        "request_id": "d65fabaa-2f2c-4e3b-9ff3-ecb56dd83aff"
    },
    "status": "ok",
    "message": "Chains retrieved successfully",
    "success": true
}