# FAQ ## How does API billing work? You will have a monthly free API call limit depending on the tier. This limit includes all requests made from the model browser in editor (eg. clicking on a model and bringing it into the scene in Unity) and during the runtime of the project (eg. calling a model through the scripting API in engine, making a request directly to our API). You will be notified via email when you are 100 requests away from reaching your free allowance in the month, after the free requests have been reached the API calls will be paid on a per request basis. For more information on tiers and to calculate usage fees visit our [website](https://get.anything.world/). ## What platforms do you support? We offer an Anything World plugin which can be installed on the [Unity ](https://anything-world.gitbook.io/anything-world/quickstart/unity-quickstart)and [Unreal ](https://anything-world.gitbook.io/anything-world/quickstart/unreal-library-quickstart)game engines, with additional platforms coming soon! Projects can be packaged for computers, web browsers, mobile platforms and others using the game engines. Our library of 3D models can also be found in our [website](https://app.anything.world/gallery), and please see the next section for custom model processing. ## Can I add custom models? We're pleased to announce that users can upload and animate their own models through the [Animate Anything web tool](https://app.anything.world/animation-rigging). See our guide on [Getting the Best Possible Results for your Model](https://anything-world.gitbook.io/anything-world/quickstart/animate-anything-quickstart/getting-the-best-possible-results-for-your-model) for more details on preparing your model for Animate Anything. We also support also support uploading models through [API request ](https://anything-world.gitbook.io/anything-world/api/rest-api-references)and with our [Python Package](https://pypi.org/project/anything-world/). We're open to discussing custom content with select partners! Reach us at . ## I have a feature request or found a problem! You can reach us via or connect with the community on [Discord ](https://discord.gg/gtxYuj6R)and we'll help out!