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

# LayerZero V1 Documentation (Legacy)

> Archived documentation for LayerZero V1. These docs are provided for reference only. For new development, use LayerZero V2.

<Warning>
  **LayerZero V1 has been deprecated.** These docs are archived for teams with existing V1 integrations. All new development should use [LayerZero V2](/v2/concepts/getting-started/what-is-layerzero).
</Warning>

# LayerZero V1 Documentation

This is the archived documentation for LayerZero V1. If you are maintaining an existing V1 integration, these pages may help you understand the original protocol design, contract interfaces, and configuration.

## Quick Navigation

<CardGroup cols={2}>
  <Card title="V1 Introduction" href="/v1/home/intro">
    Overview of the LayerZero V1 protocol and its capabilities.
  </Card>

  <Card title="V1 Deployed Contracts" href="/v1/deployments/deployed-contracts">
    All V1 endpoint addresses, message libraries, and relayer contracts.
  </Card>

  <Card title="EVM Getting Started" href="/v1/developers/evm/evm-guides/getting-started">
    How to build with LzApp on EVM chains using V1.
  </Card>

  <Card title="OFT V1.2 Standard" href="/v1/developers/evm/evm-guides/contract-standards/oft-v1-2">
    The OFT V1.2 omnichain fungible token standard.
  </Card>

  <Card title="Trusted Remotes" href="/v1/developers/evm/evm-guides/set-trusted-remotes">
    How to configure trusted remote addresses between chains.
  </Card>

  <Card title="Estimating Fees" href="/v1/developers/evm/evm-guides/advanced/estimating-message-fees">
    How to estimate cross-chain message fees in V1.
  </Card>

  <Card title="StoredPayload Troubleshooting" href="/v1/developers/evm/troubleshooting/error-messages/storedpayload">
    How to handle and fix stored payloads.
  </Card>

  <Card title="V1 Solidity Interfaces" href="/v1/developers/evm/evm-guides/evm-solidity-interfaces/ilayerzeroendpoint">
    ILayerZeroEndpoint and other V1 Solidity interfaces.
  </Card>
</CardGroup>

## Sections

### Concepts

* [LayerZero Endpoint](/v1/concepts/layerzero-endpoint)
* [Messaging Properties](/v1/concepts/messaging-properties)
* [Future-Proof Architecture](/v1/concepts/future-proof-archi)
* [Glossary](/v1/concepts/glossary)

### EVM Developers

* [Getting Started](/v1/developers/evm/evm-guides/getting-started)
* [Send Messages](/v1/developers/evm/evm-guides/send-messages)
* [Receive Messages](/v1/developers/evm/evm-guides/receive-messages)
* [Set Trusted Remotes](/v1/developers/evm/evm-guides/set-trusted-remotes)
* [Contract Standards](/v1/developers/evm/evm-guides/contract-standards/overview)
* [Advanced Guides](/v1/developers/evm/evm-guides/advanced/estimating-message-fees)
* [UA Configuration](/v1/developers/evm/evm-guides/ua-custom-configuration/overview)
* [Solidity Interfaces](/v1/developers/evm/evm-guides/evm-solidity-interfaces/ilayerzeroendpoint)

### Oracle & Relayer

* [Oracle Overview](/v1/developers/evm/oracle/overview)
* [Relayer Overview](/v1/developers/evm/relayer/overview)

### Other Chains

* [Aptos / Move](/v1/developers/aptos-move/overview)
* [Solana](/v1/developers/solana/overview)

### Technical Reference

* [Mainnet Default Config](/v1/developers/evm/technical-reference/mainnet/default-config)
* [Testnet Overview](/v1/developers/evm/technical-reference/testnet/overview)
* [Proof Types](/v1/developers/evm/technical-reference/proof-types/overview)
* [Naming Conventions](/v1/developers/evm/technical-reference/naming-conventions)
* [Interfaces](/v1/developers/evm/technical-reference/interfaces)

### Troubleshooting

* [Integration Checklist](/v1/developers/evm/troubleshooting/integration-checklist)
* [FAQ](/v1/developers/evm/troubleshooting/faq)
* [Error Messages](/v1/developers/evm/troubleshooting/error-messages/overview)

***

<Info>
  Looking to migrate from V1 to V2? Start with the [LayerZero V2 documentation](/v2/concepts/getting-started/what-is-layerzero).
</Info>