Appy developer docs
Guides for the iOS and Android SDKs, install attribution, the REST API and the MCP server.
Guides
Choose where to start
Each guide covers setup, the calls you need, limits and how to test. Code samples use the example app Acme Shop and the link domain acme.appy.to.
SDK overviewWhat the SDK does, how a link reaches your app, and what it adds to your app.iOS SDKAssociated Domains, deep links, deferred deep links, attribution, events and consent in Swift.Android SDKApp Links, the install referrer, attribution, events and consent in Kotlin or Java.Without the SDKTwo HTTP calls from React Native, Flutter, Unity, web views or your own code.How attribution worksAttributed and organic installs, verified installs, strict attribution, retention and deletion.REST APIKeys, plans, rate limits, errors, links, statistics, apps, installs and server events.MCP serverConnect Claude Code, Codex, Cursor, VS Code or Claude Desktop, with the tools and security model.Custom domainsServe your links on go.yourbrand.com with one DNS record and automatic HTTPS.
Overview
What each part is for
Smart links work without any code. The SDK, the API and the MCP server add what your apps, servers and assistants need.
| Part | Use it to | Plan | Credential |
|---|---|---|---|
| Smart links | Route every tap to the App Store, Google Play, AppGallery, an installed app or the web. No code needed. | Every plan | None |
| SDK for iOS and Android | Open the right screen, keep the link through an install, see which link brought each install, track events. | Enterprise | Publishable key (appy_pk_…) |
| Client API | Do what the SDK does from any runtime with two HTTP calls. | Enterprise | Publishable key (appy_pk_…) |
| REST API | Manage links, read statistics, register apps, send server events and look up or delete installs. | Business; apps and installs on Enterprise | Secret key (appy_sk_…) |
| MCP server | Let AI assistants create links and answer questions about clicks and installs. | Business | Secret key (appy_sk_…) |
| Custom domains | Serve your links on your own domain, with HTTPS issued and renewed automatically. | Business and Enterprise | None (dashboard) or secret key |
Reference
Quick links
The complete reference, the machine-readable spec and the places in the dashboard you will need.
Interactive API referenceEvery endpoint with schemas, examples and error responses.OpenAPI 3.1 fileThe machine-readable spec for client generators, Postman and Insomnia.MCP endpoint
https://mcp.appy.to over Streamable HTTP with a secret key.API keysCreate and revoke secret keys in the dashboard.Apps & SDKRegister apps, copy the publishable key and turn on strict attribution.Universal Link ValidatorCheck a domain’s Apple and Android association files from the browser.Ready to build?
The REST API and the MCP server are part of Business. The SDK and install attribution are part of Enterprise, and we set it up together with your team.