Source-checkedLibraries & compatibility

S1API Forked

by ifBars · for Schedule I

S1API is an open source collaboration project to help standardize Schedule One modding processes. The goal is to provide a standard place for common functionalities so you can focus on making content versus reverse engineering the game.

121KDownloads
1d agoLast updated
BepInExLoaders
ThunderstoreSource

About S1API Forked

From Thunderstore

S1API is an open source collaboration project to help standardize Schedule One modding processes. The goal is to provide a standard place for common functionalities so you can focus on making content versus reverse engineering the game.

logo

A Schedule One Mono / Il2Cpp Cross Compatibility Layer

S1API is an open source collaboration project to help standardize Schedule One modding processes. The goal is to provide a standard place for common functionalities so you can focus on making content versus reverse engineering the game.

S1API was originally created by KaBooMa as an open source collaboration project to help standardize Schedule One modding processes. This fork continues development with updates, fixes, and improvements while keeping the same spirit and goals.

Do I need this?

If you're using or plan to use any mods that depend on S1API, then yes.

How do I manually install this mod?

Installation is straight-forward.

  • Download the ZIP file from Nexus Mods or Thunderstore.
  • Extract all files locally so you have them in a folder.
  • Copy the Plugins/ and Mods/ folders into your Schedule I folder.
  • This is typically found under C:\Program Files (x86)\Steam\steamapps\common\Schedule I\

To uninstall, remove the associated plugins and mods files from the respective directories.

How do I use this to make mods?

Go check out the resources on our GitHub.

I'm getting errors from S1API, what do I do?

Please head over to the GitHub page and create a new issue for us. This helps us keep track of what problems people are experiencing.

Credits

Kaboomaz Akermi ifBars Max Chloe k0 SkyeKoi Pranjal Any other S1API contributors I may have missed


Drop us an endorsement

It's not easy being an API. Content is always king, not the backend glue. Endorsements are free and really helps drive our motivation for this project.

Highlights

From source data

Loaders

Runs on BepInEx.

Footprint

Rated a light load on a server.

Dependencies

Needs 1 other project installed alongside it.

S1API Forked on Nxeon

From our catalogue
One-click install
Not available. One-click install isn't available for this game's mods yet. Download it and upload it to your server in Files.
Server type needed
BepInEx
Server load
light
Latest build
3.2.3, released 2026-11-03

Game versions by loader

LoaderGame versionsNewest
BepInEx

From 28 recorded builds of S1API Forked.

Recent builds

BuildReleasedGame versionsLoaders
3.2.32026-11-03n/aBepInEx
3.2.22026-10-30n/aBepInEx
3.2.12026-10-09n/aBepInEx
3.2.02026-08-16n/aBepInEx
3.1.152026-08-12n/aBepInEx
3.1.142026-08-11n/aBepInEx

Dependencies

Declared by the newest build that lists any. Required ones are installed with it on one-click installs.

What kind of mod it is

From the catalog
Listed on Thunderstore as “Core”

Libraries & compatibility

Foundations and fixes other mods build on. Usually installed because something else needs it.

Compatibility

Game
Schedule I
Loaders
BepInEx
Requires
One-click install needs a BepInEx server. 1 other project installed alongside it.

Verified at the source

  • ✓ThunderstoreOfficial listing, checked 2026-11-03Open ↗
  • ✓AuthorifBars, as published on Thunderstore
  • ✓LicenseNot published by the sourceFree

S1API Forked, answered

Generated from the mod’s own source data.

Which loaders does it support?

BepInEx.

Is it free?

Yes. S1API Forked is free to download from Thunderstore.

How do I add it to my Nxeon server?

NxLabs doesn’t install Schedule I mods for you. Download S1API Forked free from Thunderstore.

NxLabs

Run S1API Forked on a Schedule I server.

Free to download from Thunderstore.