Your first milestone: one successful read
Choose the network and one question you want to answer. The downloadable helper uses a narrow, read-only method for each network: chain identity for Ethereum, an observed slot for Solana, and blockchain information for Bitcoin.
Choose your network
Read the network guide and confirm which environment your own node or provider serves.
Configure an endpoint locally
Set the endpoint and any authorization in environment variables. Do not publish private credentials in HTML, screenshots, or repository files.
Run one read and inspect the response
The helper validates transport status and RPC errors, then prints a result. It does not connect a wallet or sign anything.
Test a failure before you expand
Try missing configuration and an unreachable endpoint. Confirm that the process exits with a clear error instead of fabricating a result.
RPC_URL to your chosen endpoint. The placeholder below is intentionally not an operational service address.export RPC_URL="YOUR_HTTPS_RPC_ENDPOINT"
export NETWORK="ethereum"
node rpc-read.mjsKnow the boundary
The browser widgets on this website only change the displayed request text. The downloaded file runs only when you execute it yourself, with your own configuration. Your provider’s authorization, limits, and terms still apply.
Pick the next guide
Continue with Ethereum, Solana, or Bitcoin. Read the retry policy guide before adding automatic retries to the helper.