Polymarket Price History Guide

Polymarket Price History Guide is a practical workflow for turning Polymarket market screens into research notes you can actually review later. The core idea is simple: a prediction-market price is useful only when you understand the question, the source, the deadline, the available liquidity, and your own reason for paying attention.

This page is educational. It explains prediction-market math, market structure, and research process. It does not recommend a specific market, outcome, or trade.

Key concepts in plain English

• ▸Yes price: the amount a Yes share is trading around, usually readable as an implied probability before trading friction.
• ▸No price: the opposite side of the same question, also expressed as a price between 0 and 1.
• ▸Implied probability: the market's current price-based estimate, not a final truth claim.
• ▸Resolution source: the source named or implied by the market rules for deciding the result.
• ▸Spread: the gap between the best bid and best ask.
• ▸Depth: how much size is visible near the price you are studying.
• ▸Review trigger: a pre-written condition that tells you when to update the note.

Why this matters

Polymarket markets often look cleaner than they are. A title can be short, but the rules can include a source hierarchy, a deadline, a cancellation clause, a threshold, a tie-breaker, or a special settlement condition. The public Gamma API also exposes market metadata such as question text, descriptions, outcomes, prices, liquidity, volume, condition IDs, and resolution-source fields. The CLOB documentation explains order-book trading and authenticated order workflows, while public market-data endpoints support research workflows such as price and history checks.

That does not mean a price is automatically actionable. A price can move because the evidence changed, because a deadline got close, because an order book thinned out, or because traders reacted to a headline before reading the full rule text. Bucko-style research slows that down.

The Bucko worksheet

Use this before acting on a Polymarket idea:

Market URL:
Exact question:
Resolution source:
Deadline / cutoff:
Current Yes price:
Current No price:
Bid / ask spread:
Visible depth near the price:
My probability range:
Main evidence source:
What would change my view:
Max dollar risk for the idea:
Related markets with same driver:
Post-resolution lesson:

If those fields are empty, the price is just a screen quote. If those fields are filled, the idea becomes something you can audit.

Step-by-step workflow

1. Start with the exact question

Copy the full market wording before writing any opinion. A market about a team winning, a data release crossing a threshold, or a word being mentioned can resolve differently than the headline suggests. Titles are discovery tools. Rules decide edge cases.

2. Translate the price carefully

A Yes price near 0.40 can be read as roughly 40% implied probability. A Yes price near 0.75 can be read as roughly 75% implied probability. That translation is useful, but it is only the first layer. The fillable price may be worse than the displayed last price if the spread is wide or visible depth is thin.

3. Add the source and deadline

For event markets, the strongest note is usually not “I think this happens.” It is “the market resolves from this source, during this time window, under these rules.” That keeps the forecast attached to the contract instead of the news cycle.

4. Check liquidity before size

A small market can show a clean probability but still be difficult to enter or exit at that price. Record bid, ask, spread, and depth before writing a size cap. Last price and executable price are not the same thing.

5. Write the review trigger first

Before the event resolves, decide what evidence would force an update. Examples: an official data release, a league announcement, a court filing, a weather agency update, a source outage, or a large spread expansion.

Example: price is not the whole story

Suppose a Yes share is shown around 0.48. A lazy note says, “market says 48%.” A better note says:

• ▸Yes price: 0.48
• ▸Bid/ask: 0.46 / 0.50
• ▸Spread: four cents
• ▸Source: named official data page
• ▸Deadline: final reading by a specific date
• ▸My range: 44% to 52%, pending source update
• ▸Max risk: capped before entry
• ▸Review trigger: update only after the official source posts the next reading

That second note is reviewable. Even if the outcome goes the other way, the process can be scored.

Common mistakes

• ▸Using last trade as the fill price. Check the current book and spread.
• ▸Ignoring rule text. The exact resolution criteria matter more than the social-media version of the event.
• ▸Overreacting to one candle. Price history needs source context.
• ▸Forgetting related exposure. Several markets can depend on one event driver.
• ▸Skipping the post-resolution review. The learning happens after the market closes.

How Bucko fits

Use Bucko as the research, journaling, and guardrail workspace around Polymarket: timestamped price snapshots, source links, probability ranges, risk caps, correlation tags, and post-resolution notes. The goal is not to outsource judgment. The goal is to make the judgment visible, repeatable, and easier to review.

Polymarket CTA

If you are eligible for the US app offer, use code BUCKO for a $50 deposit bonus on the Polymarket US app: https://www.poly.market/BUCKO. Confirm current eligibility, app screens, and offer terms before depositing.

Sources and last-verified notes

• ▸Polymarket docs checked 2026-07-03 PDT: trading overview, create-order documentation, authentication docs, Negative Risk page, and market-data documentation for fetching markets and public data.
• ▸Polymarket public Gamma samples checked 2026-07-03 PDT; active examples showed sports, World Cup, crypto, app/mindshare, macro, and event-resolution structures with descriptions, outcomes, prices, volume, liquidity, and resolution-source fields.
• ▸Bucko/Polymarket partner offer wording is user-provided: code BUCKO, $50 deposit bonus for eligible U.S. app downloads, https://www.poly.market/BUCKO. No newer official affiliate term sheet was independently located during this run.