groupcart

changelog

10-11 02:10: krish's group carts are live: text "start group movie night".

10-11 01:45: the agents moved out of a laptop. they live on a server now.

10-11 01:05: get your agent: sign up here with a name and a phone number.

10-10 21:20: the minion is justin's pixel art now. it waves, walks when you scroll and watches your mouse.

10-10 17:40: this website.

10-10 16:41: wrote the hosted plan: sign up with just a phone number.

10-10 16:13: a script that registers phones on the photon project.

10-10 15:51: agents may only send files from the media cache.

10-10 15:50: iphone receipt photos (heic) become jpeg before the model sees them.

10-10 15:47: imessage agents limited to split, vault, browser and web tools.

10-10 15:46: the card vault: cards over text, per-person scoping, a checkout gate.

10-10 15:41: walk the whole model fallback chain. clearer share wording.

10-10 15:32: the split plugin: ledger, share math, agents' room, nessie bank.

10-10 15:29: vendored the agent runtime into core/ and said so in the readme.

10-10 12:14: nessie ledger payments, gemini multi-key fallback.

10-10 11:53: payments switched to capital one nessie.

10-10 11:45: hacking starts. a spectrum imessage agent with a gemini tool loop.

run it

the whole dinner, real model, no phones:

scripts/demo_cli.sh

the live iMessage agent:

./gc gateway run

watch the agents talk:

./gc split room --watch

receipt.png

SUSHI NIKKO Sat Oct 10 2026 · Table 12 California Roll8.50 Dr Pepper3.00 Spicy Ramen16.00 Edamame6.00 Salmon Nigiri14.00 2 Sapporo14.00 Chicken Katsu15.00 Tax5.55 Tip15.00 TOTAL97.05

greetings

welcome to groupcart!

Split any bill by texting your agent a photo of the receipt. Every friend has their own agent in iMessage. The agents talk among themselves, each one asks its own human what they had, and everyone gets a text with exactly what they owe: items, tax and tip.

Nobody does arithmetic and nobody chases anybody. Built in one weekend at HackNC 2026.

how a split works

get your agent

Your number is used for one thing: telling the phone line that you may text your agent.

the dinner, replayed

Bob paid for sushi with John, Susan and Charlie. This is scripts/demo_cli.sh on three screens. The texts the tools write are word for word; hover a grey bubble to see which ones are the agent's own wording.

the dinner, replayed

1/7 1×

site map

HOME: you are here! get your agent at the top
THE SPLIT: receipt to settled in eight steps, plus a calculator that uses the agents' own math
THE VAULT: how an agent pays with your card without ever seeing it
UNDER THE HOOD: three compartments and three sponsors
FAQ: questions you might have
CREDITS: who made this, and what we did not make

tracks

photonimessage agent geminithe model nessiecapital one hacknc2026 integercents only no cardsin the model