Mechanism LabONCHAIN MECHANICS
Learning tools

Learning toolsThese tools appear when the journey reaches them, or you can open them directly here.

Value pathAfter several mechanisms, inspect how value and risk cross boundaries.LabLeave the lesson prompts and freely change or break the mechanism.ChallengesUse cross-module questions to test whether the boundaries really hold.GlossaryLook up unfamiliar terms and return to the related lesson.Research journalSave experiment states, compare outcomes, and write your explanation.
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OPEN LAB · ORDERBOOK ENGINE

Matching Engine Free Lab

Submit limit or market orders, cross the spread, and observe partial fills, depth impact, cancel-replace, and risk events. Assets are virtual credits; no wallet or investment advice.

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ENGINE RUNNINGLAB / credits
ORDERBOOK 001 · PRICE / TIME PRIORITY

LAB / credits

Limit orders enter the queue; only a crossed book turns them into fills.

Last trade—credits / LAB
Best bid98highest buy
Best ask102lowest sell
Spread4ticks
Traded0LAB
Live order bookPrice / remaining / source
Asks (SELL)Bids (BUY)
1022A
1023B
1055A
983B
965A
——Empty
Best ask: 102Best bid: 98
Coach

Read the book first: best ask is the lowest sell, best bid is the highest buy. Matching starts only when buy price reaches sell price.

Engine events1 EVENTS
  1. 01

    Book created: best ask 102 分（两个价位相同's 订单），best bid 98 .price and time priority must be preserved。

ACTION HISTORYExperiment timeline
1 state snapshots

Use the slider to return to an earlier step. Continuing from there replaces the later history with a new sequence.

Initial state
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