> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cdp.coinbase.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Onchain Tools

> Gas sponsorship, blockchain data, AI agent tooling, and testnet utilities for onchain development.

CDP Onchain Tools gives you infrastructure-level access to everything below the application layer: sponsor gas for your users, query onchain data at scale, equip AI agents with wallet capabilities, and fund testnet accounts during development.

## Tools at a glance

<CardGroup cols={2}>
  <Card title="Paymaster" icon="gas-pump" href="/paymaster/introduction/welcome">
    Sponsor gas fees on behalf of your users. Works with ERC-4337 smart accounts on Base to create gasless experiences without users needing ETH.
  </Card>

  <Card title="Data" icon="database" href="/data/get-started/overview">
    Query and monitor onchain data with sub-500ms latency. Includes a SQL API, RPC node access, token balances, wallet history, and real-time webhooks.
  </Card>

  <Card title="AgentKit" icon="robot" href="/agent-kit/welcome">
    A toolkit for giving AI agents onchain capabilities — transfers, swaps, contract deployments, and more — using any AI framework.
  </Card>

  <Card title="Faucet" icon="faucet" href="/faucets/introduction/welcome">
    Claim testnet tokens for Base Sepolia, Ethereum Sepolia, and Solana Devnet during development.
  </Card>
</CardGroup>

## Choosing the right tool

**Eliminate gas friction for your users.** Use [Paymaster](/paymaster/introduction/welcome) to sponsor ERC-4337 smart account transactions on Base so users never need to hold ETH.

**Read or monitor onchain state.** Use [Data](/data/get-started/overview) to query balances, transaction history, or live events via SQL, RPC, or webhooks — no node infrastructure required.

**Add wallet capabilities to an AI agent.** Use [AgentKit](/agent-kit/welcome) to let your agent sign transactions, execute swaps, and deploy contracts using any AI framework (LangChain, Vercel AI SDK, etc.).

**Get testnet tokens for development.** Use the [Faucet](/faucets/introduction/welcome) to claim ETH, ERC-20, or SPL tokens on Base Sepolia, Ethereum Sepolia, and Solana Devnet.

## What to read next

* [Paymaster quickstart](/paymaster/introduction/quickstart), enable gas sponsorship in your app
* [Data quickstart](/data/get-started/quickstart), run your first onchain query
* [AgentKit quickstart](/agent-kit/getting-started/quickstart), build your first onchain AI agent
* [Faucet quickstart](/faucets/introduction/quickstart), claim testnet tokens