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← Projects · Jul 2026

CrowdShift

A market that pays commuters to miss the crush: shift your trip off-peak and get paid once the shift is verified.

crowdshift.vercel.app ↗

The idea came from concert nights. Anyone who has left the Sports Hub after Blackpink, Lady Gaga or Billie Eilish knows the crush at Stadium station: a whole stadium funnelling into one Circle Line platform at the same time, most of them in no hurry at all. I kept thinking that the people with time to spare should be paid to take a later train, and the crowd would manage itself.

CrowdShift is that idea, built for the everyday version of the problem. The morning crush on a train line lasts about thirty minutes; if you shift your trip by fifteen, CrowdShift pays you the moment the shift is verified.

It reads the live LTA DataMall feed, generates keys in the browser, clears the market deterministically in integer cents, signs a receipt for each verified shift, and settles over x402 on the Base Sepolia testnet.

I built it alone in seven hours at BUIDL OPC in Singapore, hosted by Amber Group and co-hosted by Claude Community SG and the Lifelong Learning Institute, where it placed in the Top 10. I’m proud of that one.

CrowdShift landing page: “Earn for waiting”, over a schematic of Singapore’s MRT lines, with a live LTA DataMall crowd signal in the corner.
The front page, with the live crowd feed.
CrowdShift’s clearing room: “What would make waiting worthwhile?”, with four trains from 08:15 to 08:45 labelled crushed, busy, easing and quiet, and a promise form: I can leave 15 minutes later and earn at least S$0.52.
The clearing room: pick a later train, set your minimum price, and the market clears in integer cents.
Martina at a hackathon table, headphones on, typing on a laptop, with other builders out of focus behind her.
Building, at the Lifelong Learning Institute.
Martina at a lectern on stage, pitching CrowdShift, with the clearing room on the big screen behind her.
Pitching as a Top 10 finalist, 12 July 2026.
A group of builders and organisers in front of the BUIDL OPC Hackathon SG stage, with the run-of-show slide behind them.
Some of us at the end of BUIDL OPC, 12 July 2026, after many had already left.