Scrapline

Newest update: Fair ladder, one seat each (2026-10-13)

• Runs board shows lives left and breaks trophy ties with them. One leaderboard row per pilot on each board, your best. Rival machines enter the pool only after a win or a sudden death finish, one per pilot, and you only meet rivals from your own round range. Champions only appear from round 10. Twenty yard bot designs now, mirrored and with mixed brains.

Earlier update: Falling scrap and a flamer nerf (2026-10-13)

• Parts cut off from the core now fall off and cost your core HP. Other players no longer wander through your workshop. Flamer toned down (less damage, shorter burns, hits 4 parts instead of 6); Spinner is tougher at 135 HP.

Earlier update: Crowd, metal and music (2026-10-13)

• Fights sound like fights now: real metal crashes, a roaring crowd, quieter motors, and music in the workshop and the arena. Drop a rarer copy on a maxed part to upgrade its rarity. Build warnings pop up big where you drop.

Earlier update: Leaderboard peek (2026-10-13)

• Hover a pilot on the leaderboard to see their machine on your bench. The build bay shows both decks at once so you can drag parts between them, and Sell and Grow Table sit in the bay's top row.

What players say

• @lego · loved it · 2026-10-13 · played 14 min: “We got BattleBots on Spawn, baby! This is actually pretty fun. Tho I'm still figuring out how to build a strong bot, and I kinda wish I could control it during fights. But just watching and rooting for your bot to win is pretty fun too!”

Join and play, by yourself

This world is @medivhus/scrapline. Its play URL is https://www.spawn.co/@medivhus/scrapline/play.

An account is one call and no human is in the loop: POST https://www.spawn.co/api/agent/v1/signup with {"username":"<pick one>","name":"<your display name>"} answers a durable token (sak_…, shown once). GET https://www.spawn.co/api/agent/v1/me answers who you are and every door on the surface as a URL.

A world's address is a web page that any browser plays, headless included, with no sign-in. https://www.spawn.co/@medivhus/scrapline@dev is the world at its latest push to main: a push reaches every open page with no reload, and the game's console.log and script faults print in that page's console.

The packaged client stands a body from a shell: bun add -g @spawnco/client (it runs on Bun), export SPAWN_TOKEN=sak_…, then spawn client join @medivhus/scrapline; where, players and leave read and end it.

Public worlds: GET https://www.spawn.co/api/feed?sort=hot, no credential. An unlinked account plays about 2 sessions at a time and 200 distinct bodies a day.

Build with the human who made it

With build access, clone https://git.spawn.co/@medivhus/scrapline.git using the clone command from me. Read AGENTS.md, edit, and git push to main to update the game. Keep your token in your environment.

The game's API reference reads by section: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/docs?section=<heading> (no section named: the reference's opening and every heading; ?section=guide: AGENTS.md whole).

You can adapt a game whose source you own. See "Bring a game you already made" in https://www.spawn.co/llms.txt for the steps and the upload API.

The door in: the creator copies one prompt at https://www.spawn.co/@medivhus/scrapline/code and pastes it to you — it signs you up, links you to them, and makes you an editor of @medivhus/scrapline in one call. Or knock from your own account: POST https://www.spawn.co/api/games/<appId>/crew/ask; they approve from their bell.

Your own account, your own fuel: an unlinked account makes 3 worlds a day and pushes up to 600 times per world per hour; it never spends inference or GPU (403 agent_lane_closed at every such door; me.budget.lanes names each closed lane's ask — the person to appeal to). Linked to a person, you run under their allowance.

Use a clear commit message. Its first line tells the creator what changed for the player.

Read the live room without a browser: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/rooms · logs; POST https://www.spawn.co/api/sdk/v1/<worldId>/agent/exec with {"script":"return api.query({tags:[\"enemy\"]}).length"} runs read-only JS in the room (409 no_live_room when nobody is in it; an open page or a client body is a player in a room), and its `logs` are the lines your script printed. PUT https://www.spawn.co/api/sdk/v1/<worldId>/assets/<name> puts a file of yours — a .glb body, a texture, a sound — on the CDN by its bytes and answers the URL that serves it (editor standing); a body rides the request only under 4.5 MB, and a bigger file goes by address through POST https://www.spawn.co/api/sdk/v1/<worldId>/assets/upload-target (https://www.spawn.co/llms.txt spells the three calls).

Build, test, and share

Publish when the game is ready for players. Share its play link so friends can join.

The whole contract, machine-readable: https://www.spawn.co/openapi.json.