# NullBot RPC

> JSON-RPC (HTTPS and WebSocket) for Ethereum, Robinhood, Ink, Arc and Elysium mainnets, served from NullBot's own nodes. One API key works on all five chains: https://rpc.nullbot.io/v1/{eth|robinhood|ink|arc|elysium}/{api-key}. Flat monthly plans with per-second rate limits and no monthly request cap.

Every page below is Markdown. The whole set in one file: https://console.nullbot.io/llms-full.txt

## Get Started

- [Introduction](https://console.nullbot.io/docs.md): What NullBot RPC is, the five chains, and the base URLs.
- [Quickstart](https://console.nullbot.io/docs/quickstart.md): Get a key and make your first call with curl, ethers, viem, web3.py or Foundry.
- [Authentication](https://console.nullbot.io/docs/authentication.md): API keys in the URL or the x-api-key header, key management and browser use.

## Chains

- [Overview](https://console.nullbot.io/docs/chains.md): Chain slugs, chain IDs, gas tokens and history windows for every chain.
- [Ethereum](https://console.nullbot.io/docs/eth.md): Ethereum endpoints, limits, history and every supported method.
- [Robinhood](https://console.nullbot.io/docs/robinhood.md): Robinhood endpoints, limits, history and every supported method.
- [Ink](https://console.nullbot.io/docs/ink.md): Ink endpoints, limits, history and every supported method, including optimism_*.
- [Arc](https://console.nullbot.io/docs/arc.md): Arc endpoints, limits, history and every supported method; gas is paid in USDC.
- [Elysium](https://console.nullbot.io/docs/elysium.md): Elysium endpoints, limits, history, priority fees and every supported method; gas is paid in HYPE.

## Guides

- [Rate Limits](https://console.nullbot.io/docs/rate-limits.md): Per-second limits per plan, bursts, rate-limit headers, 429 and heavy calls.
- [Logs and eth_getLogs](https://console.nullbot.io/docs/logs.md): Block-range limits, the 10,000-log cap and Ethereum filter rules.
- [WebSockets](https://console.nullbot.io/docs/websockets.md): Connections, subscriptions, limits and close codes.
- [Filters](https://console.nullbot.io/docs/filters.md): Polling filters, how many you can have and when they expire.
- [Sending Transactions](https://console.nullbot.io/docs/transactions.md): eth_sendRawTransaction, eth_sendRawTransactionSync and where sends go on each chain.
- [Batch Requests](https://console.nullbot.io/docs/batching.md): Batch sizes, how batches count against limits, and request/response size caps.

## Reference

- [Errors](https://console.nullbot.io/docs/errors.md): Every gateway error with its HTTP status, code, message and what to do.
- [Plans and Billing](https://console.nullbot.io/docs/billing.md): Prices, paying in USDC or USDG, renewing (no grace period), upgrades, refunds and overpayments.
- [Docs for AI Tools](https://console.nullbot.io/docs/llms.md): llms.txt, llms-full.txt and per-page Markdown for AI assistants.