Supported Chains

Overview

Returns information about supported EVM blockchain networks. Each network is identified by its numeric chain ID and a human-readable name, so you can map chain IDs to network names across the API.

Business Value

• Network Discovery: Easily identify which EVM networks are available for data queries
• Integration Planning: Plan multi-chain applications by understanding supported networks
• Chain Validation: Verify chain compatibility before making network-specific API calls
• Development Support: Simplify blockchain application development with network enumeration
• Network Monitoring: Track the expansion of supported blockchain networks over time

Endpoint Details

URL:

https://api.cambrian.org/evm/chains

Method: GET
Authentication: Required via X-API-Key header

Query Parameters

Response Field Descriptions

Examples

1. List all supported EVM chains

Retrieve the full list of EVM chains currently supported by the API.

curl -X GET "https://api.cambrian.org/evm/chains" \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json"

Response:

[
  {
    "columns": [
      {
        "name": "id",
        "type": "UInt32"
      },
      {
        "name": "name",
        "type": "String"
      }
    ],
    "data": [
      [
        1,
        "ethereum"
      ],
      [
        8453,
        "base"
      ],
      [
        42161,
        "arbitrum"
      ],
      [
        4663,
        "robinhood"
      ]
    ],
    "rows": 4
  }
]

Note: Result collections are limited to 10 items. This response returns 4 supported chains: Ethereum (id 1), Base (id 8453), Arbitrum (id 42161), and Robinhood (id 4663).

x402 Payment Option

This endpoint supports pay-per-use access via the x402 payment protocol (v2): pay $0.05 USDC per request using blockchain micropayments. No API key required.

Quick Start (TypeScript)

npm install @x402/fetch @x402/evm viem

import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const signer = privateKeyToAccount(process.env.EVM_PRIVATE_KEY as `0x${string}`);
const client = new x402Client();
client.register("eip155:*", new ExactEvmScheme(signer));

const fetchWithPayment = wrapFetchWithPayment(fetch, client);
const response = await fetchWithPayment(
  "https://x402.cambrian.org/evm/chains"
);
const data = await response.json();

Quick Start (Python)

pip install "x402[httpx]"

import asyncio, os
from eth_account import Account
from x402 import x402Client
from x402.http.clients import x402HttpxClient
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

async def main():
    client = x402Client()
    account = Account.from_key(os.getenv("EVM_PRIVATE_KEY"))
    register_exact_evm_client(client, EthAccountSigner(account))

    async with x402HttpxClient(client) as http:
        response = await http.get("https://x402.cambrian.org/evm/chains")
        print(response.json())

asyncio.run(main())

Payment Flow

1. Send a normal request to the endpoint (no API key needed)
2. Server returns 402 Payment Required with payment details
3. The x402 SDK automatically signs a payment authorization with your wallet
4. The SDK resubmits the request with the signed payment
5. Server verifies payment and returns the API response

The x402 SDK handles steps 2 through 5 automatically.

Network: Base (chain ID 8453) | Currency: USDC | Price: $0.05 per request