## Documentation Index

Fetch the complete documentation index at: [/llms.txt](https://docs.relay.link/llms.txt)

Use this file to discover all available pages before exploring further.

Relay supports cross-chain transaction execution for arbitrary cross-chain transactions. This means a user can execute any call on any chain and pay with any token on any other chain. This feature is perfect for cross-chain checkout experiences as well as full chain abstraction.

**Gas requirement**: With standard EOA wallets, the user still needs a small amount of native gas token (e.g., ETH) on the **origin chain** to broadcast the initial deposit transaction. Relay handles all destination chain gas and deducts fees from the user’s tokens, but the origin chain submission requires native gas. For a fully gasless experience where users hold **zero native tokens**, see [Gasless Swaps](https://docs.relay.link/features/gasless-swaps) to find the right approach for your app, or explore [Smart Accounts](https://docs.relay.link/references/api/api_guides/smart_accounts/smart-accounts) (EIP-7702 or ERC-4337) directly.

## How it Works

Relay’s cross-chain execution is powered by cross-chain intents. This model results in low-cost, low-latency (1-10 seconds) cross-chain transactions. When a user wishes to perform a cross-chain action, they submit the call data to get a quote from relayers for execution. When they accept the quote, the order is validated and they submit a transfer to the [Relay Depository Contract](https://docs.relay.link/references/protocol/overview). A relayer then instantly fills the transaction on the destination chain before unlocking the funds on the origin. Learn how to integrate cross-chain call execution with our [Call Execution Integration Guide](https://docs.relay.link/references/api/api_guides/calling-integration-guide).