RetroAPI
by Slainlight
RetroAPI is a library for other mods that adds blocks, items, recipes, entities and dimensions to Minecraft Beta.
What it does
Mods built on RetroAPI register custom blocks and items with stable IDs that are assigned automatically and kept across loads. Block IDs extend well past the vanilla limit of 256, and block entities can be declared without subclassing BlockWithBlockEntity. Inventory menus for chests, furnaces and dispensers come with slot synchronization, and crafting, smelting and furnace-fuel recipes are registered through the same library.
The library also covers entities with renderers, new worlds that players enter through portal blocks, achievements with achievement pages, sound autoloading, automatic language translation generation, and an expanded texture atlas with custom block item renderers. Networking runs over OSL and maps IDs from server to client, so extended block chunks stay in sync.
The mod runs on Babric and Ornithe for the b1.7.3 game version only, and is published as a client and server mod, so both sides need it. Its Ornithe Fabric Loader support runs transparently over OSL Babric. Snapshot builds are published alongside the release files. RetroAPI is released under the MIT License and is open source; the source code and issue tracker are public. It is incompatible with Retro Sprint, RetroCommands and RetroTweaks.
Key features
Custom blocks and items
Blocks and items are registered with automatic stable ID assignment, and block IDs go well past the vanilla cap of 256.
Block entities without subclassing
A block entity can be attached through RetroBlockEntityType, so a mod does not need to subclass BlockWithBlockEntity.
Menus with slot sync
Inventory GUIs for chests, furnaces and dispensers come with automatic slot synchronization between server and client.
Recipes and smelting
Crafting, smelting and furnace-fuel recipes are registered through the RetroRecipes system.
Dimensions and entities
Entities with renderers and dimensions entered through portal blocks can be added by mods that use the library.
Optional StationAPI support
A companion module loads only when StationAPI is present, and delegates registration, rendering and world handling to it.
Gallery
Requirements
Dependencies declared by the latest file for each loader.
Incompatible 3
How it compares
StationAPI is a Fabric and Babric library under the MIT License and is open source, but its environment is client required with the server optional. RetroAPI is a client and server library for Babric and Ornithe under the MIT License. FarnUtil is a client-side only utility library for Fabric, Babric and Ornithe under the MIT License, and is open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| RetroAPI | Babric and Ornithe | b1.7.3 | Client and server | 2026-08-16 |
| StationAPI | Fabric and Babric | b1.7.3 | Client required, server optional | 2026-09-05 |
| FarnUtil | Fabric, Babric and Ornithe | b1.7.3 | Client-side only | 2026-07-02 |
Questions
Does RetroAPI need StationAPI installed?
Which loaders does RetroAPI support?
Does RetroAPI have to be installed on both sides?
In the catalog
RetroAPI is one of 3,514 Library mods on ModsFinder. 567 mods support Minecraft b1.7.3.
More from Slainlight
Similar mods
What the author says
RetroAPI is a content-registration library for Minecraft Beta 1.7.3 that lets mods add blocks, items, recipes, entities, dimensions and more without requiring StationAPI. It runs on Ornithe (Fabric Loader + OSL) and Babric, and transparently delegates to StationAPI when that mod is also installed. Registration …
Official listing
- Modrinth page
- modrinth.com/mod/retroapi
- Owner
- Slainlight
- Published
- 2026-03-23
- Updated on Modrinth
- 2026-08-16
- Facts verified
- 2026-10-15