Ethereum Sepolia RPC, on the same interface as every other chain.

Sepolia is the standard Ethereum test network for application development. Use a separate API key for test work and its traffic stays in that key's own usage series, apart from your production key.

1. 01

   Create an API key

   Sign up for Iteradian and create a key in the dashboard. Production keys are prefixed itrd_live_ and test keys itrd_test_. The plaintext key is shown exactly once, so store it in a secret manager — never in source control.

2. 02

   Send a JSON-RPC 2.0 request

   curl -X POST https://api.iteradian.com/rpc/v1/eth-testnet \
     -H "Content-Type: application/json" \
     -H "X-Api-Key: itrd_live_YOUR_KEY" \
     -d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}'

   const res = await fetch("https://api.iteradian.com/rpc/v1/eth-testnet", {
     method: "POST",
     headers: {
       "Content-Type": "application/json",
       "X-Api-Key": process.env.ITERADIAN_API_KEY!,
     },
     body: JSON.stringify({
       jsonrpc: "2.0",
       id: 1,
       method: "eth_blockNumber",
       params: [],
     }),
   });
   
   const { result } = await res.json();

   import os, requests
   
   res = requests.post(
       "https://api.iteradian.com/rpc/v1/eth-testnet",
       headers={"X-Api-Key": os.environ["ITERADIAN_API_KEY"]},
       json={"jsonrpc": "2.0", "id": 1, "method": "eth_blockNumber", "params": []},
   )
   
   print(res.json()["result"])

3. 03

   Handle throttling

   Requests past your plan’s per-second rate or concurrency ceiling return HTTP 429 with JSON-RPC error code -32005 and a retryAfter value in error.data. Past the monthly allowance, requests run as metered overage until the plan’s overage cap, then return 429 with -32007. Throttled requests are recorded in your usage and request log too — nothing is dropped silently.

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