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Will Manifold's API Add Fractional Limit Orders?
9
Ṁ100Ṁ533
Dec 31
42%
chance

Manifold's limit order API allows traders to place limit orders in increments of single percentage points.

For example, you can buy YES at 50% and 51%, but you can't place a limit order at 50.5%. Trying to do so yeilds the error:

{ "message":"limitProb must be in increments of 0.01 (i.e. whole percentage points)" }

This market resolves YES should manifold ever change this behavior by EOY 2026.

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But I'll be pissed when your limit order at 49.99 gets filled before mine at 50

opened a Ṁ250 NO at 20% order

For this to resolve YES, do you need to be able to place an order at 50.5% specifically? I think it's more likely they add fractional orders at the extremes, like <5% and >95%.

@wasabipesto either will resolve YES, even if I'd much prefer fractional orders at every level :)

I'm not sure I see the point in this. Are your probability judgements so precise that you would want to bet at 50.5% but not 50% or 51%?

@xjp yes, in some cases when betting on futures, stochastic events, etc I really do want to bet the results of my math. 1% increments are too course grained and are probably why I'll leave the platform soon.

Also consider scenarios where a market's probability is already near 5 or 95%. A single percentage point means a lot in terms of liquidity. 99% to 99.9% lets you express notions of 1 in 100 and 1 in 1000 too, which is a very natural distinction in some markets.

I'm not saying the UI needs to show these numbers btw. For casual users 1% increments are fine. But for power users using the API we could get so much out of it

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