Clobber, live
A real matching engine, a real double-entry ledger, real markets of all three kinds. No account needed: create a passkey, claim play money, trade. Yesterday's markets settled this morning; you can watch today's do the same.
Create a passkey to get a trading identity. No email, no form, no company. Your browser is your account.
No trades in the last 8.3 hours.
Candles are derived from trades, and a bucket with no trade in it is not drawn. This chart loads the most recent 500 1m buckets, so a market that trades a few times a day shows nothing at this timeframe.
Book
Tape
Trade
Create your identity above to place orders. Reading is free; you are watching the real book right now.
Command log
Every command that named GEMS-PLAY, read from the cell's journal in the order it was written. The sequence is the position on the tape; the same tape ships to object storage every five seconds, and this sandbox keeps thirty days of it. Nothing here is a projection: it is the log the engine replays.
Reading the tape…