# Developers - [Quickstart](https://docs.nomad.xyz/developers/quickstart.md): Your one-stop shop to start building cross-chain applications (xApps). - [Send Messages](https://docs.nomad.xyz/developers/quickstart/send-messages.md): The on-chain API for sending cross-chain messages - [Receive Messages](https://docs.nomad.xyz/developers/quickstart/receive-messages.md): The on-chain API for receiving cross-chain messages - [Environments](https://docs.nomad.xyz/developers/environments.md): Interact with Nomad across testnet and mainnet environments - [Domain (Chain) IDs](https://docs.nomad.xyz/developers/environments/domain-chain-ids.md) - [Application Developers](https://docs.nomad.xyz/developers/application-developers.md) - [Building xApps](https://docs.nomad.xyz/developers/application-developers/building-xapps.md) - [SDK](https://docs.nomad.xyz/developers/application-developers/sdk.md) - [Contracts SDK](https://docs.nomad.xyz/developers/application-developers/sdk/contracts-sdk.md) - [Typescript SDK](https://docs.nomad.xyz/developers/application-developers/sdk/typescript-sdk.md) - [Examples](https://docs.nomad.xyz/developers/application-developers/examples.md) - [Ping Pong](https://docs.nomad.xyz/developers/application-developers/examples/ping-pong.md) - [Advanced](https://docs.nomad.xyz/developers/application-developers/advanced.md) - [Router Pattern](https://docs.nomad.xyz/developers/application-developers/advanced/router-pattern.md) - [Node Operators](https://docs.nomad.xyz/developers/node-operators.md) - [Running Agents Guide](https://docs.nomad.xyz/developers/node-operators/running-agents-guide.md) - [Troubleshooting](https://docs.nomad.xyz/developers/node-operators/running-agents-guide/troubleshooting.md): Hints for dealing with common (and not so common) Agent failures. - [Running a Watcher](https://docs.nomad.xyz/developers/node-operators/running-a-watcher.md) - [Agent Operations](https://docs.nomad.xyz/developers/node-operators/agent-operations.md) - [Agent Gas Values](https://docs.nomad.xyz/developers/node-operators/agent-gas-values.md) - [The Keymaster](https://docs.nomad.xyz/developers/node-operators/the-keymaster.md) - [Core Developers](https://docs.nomad.xyz/developers/core-developers.md) - [Upgrade Setup](https://docs.nomad.xyz/developers/core-developers/upgrade-setup.md) - [Deploying Contracts](https://docs.nomad.xyz/developers/core-developers/deploying-contracts.md) - [Development](https://docs.nomad.xyz/developers/core-developers/deploying-contracts/development.md) - [Production](https://docs.nomad.xyz/developers/core-developers/deploying-contracts/production.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.nomad.xyz/developers.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.