PolymarketScan

What it is

A free explorer for Polymarket, read from the Polygon chain and Polymarket's public APIs. The core is three kinds of page: a trader page for any wallet or username — P&L, open positions, trade history, win rate and badges; a market page with the live mid-price, a depth chart, volume and liquidity history, the ten largest holders on each side, news markers on the price chart and matched posts from X; and a transaction page for a single fill with a link to Polygonscan.

The whale radar flags any single fill of $5,000 or more and posts it to the page, an X account (@PolyWhaleAlerts) and a Telegram bot with keyword filters. Trades carry badges — whale, sharp for wallets with sustained profit, sniper for high returns in thin markets — and the API tags fills with anomaly labels such as a new wallet or a trade large against the market's volume. Around them sit leaderboards cut by Polymarket's own event tags (Geopolitics, Bitcoin, NBA, Fed Rates), shareable wallet watchlists, a "losers" board of wallets holding losing positions, and an estimator of a possible $POLY airdrop per wallet.

The rest is a long tail of experiments: a Polymarket-versus-Kalshi price comparison, an AI-flagged scanner for markets with ambiguous rules, a paper-trading arena for AI agents run through the agent API, a chat assistant, challenges, and a marketplace for selling picks. The picks marketplace is what sets the flag at the foot of this card; see Limitations. The tail also sheds pages: an "AI vs Humans" page that ranked markets by how far language-model estimates sat from the price has been retired, and the app's router now sends /ai-vs-humans, and the /agents arena pages, to the home page.

Availability

Nothing to sign up for to read it, nothing to deposit and no identity check. Signing in, which some features want, is by wallet connection or email. The terms set out no geography of their own; they say the market data comes from international Polymarket, which is view-only for US users, and that US residents may be able to trade on Polymarket US where eligible. Reading the data is therefore open to a US reader, and acting on it on the international venue is not.

Checked against the terms of service and privacy policy on 30 September 2026. Both carry a last-updated date of 25 December 2024, which is older than some of what they describe: the terms mention Polymarket's builder programme and Polymarket US, so the text has moved without the date moving.

Pricing

Free, in the sense the site means it: every trader page, market page, whale feed, leaderboard and the airdrop estimator are open without a paywall, a signup or a meter, and market data pages are published under CC BY 4.0. The agent API and MCP server are free as well.

The one priced thing is the chat assistant. The site's code labels three tiers for it — a visitor, a free account, and Copilot Pro at $10 a month for a larger message quota and what it calls a "priority brain" — with card and USDC billing endpoints behind the upgrade. There is no pricing page (the /pricing path returns "Page Not Found"), so the figure comes from the shipped app rather than a published plan table.

What pays for the rest is disclosed on the page: PolymarketScan is in Polymarket's builder (referral) programme and may earn a fee when you follow its links to Polymarket and trade. Its own documentation also lists premium analyst panels and embeddable widgets for publishers as revenue. None of that costs the reader anything; it does mean the site is paid when you trade.

The picks marketplace has its own money flow. A trader who signs up as an "influencer" sets a monthly price for their picks, "Set $0 for free access, or any price up to $5,000", and the subscribe box says "80% goes to the trader", so PolymarketScan keeps 20% of every paid subscription. That is a third party's price, not the site's, so it is not a tier on this card. On 1 October 2026 neither listed trader charged anything.

Checked on 30 September 2026; the chat tiers and the picks terms re-read from the app's code on 1 October 2026.

Markets & resolution

It resolves nothing and places no orders. Every market, price and outcome is Polymarket's, settled by Polymarket through the UMA optimistic oracle, and the site's own caveats point out that P&L shown during a dispute window may change once the vote concludes.

The documented refresh cadence differs by surface: trades in real time from on-chain events, leaderboards hourly, airdrop scores daily at midnight UTC; the agent API caches responses for 60 seconds and refreshes its data every two to five minutes. Headline wallet P&L uses Polymarket's own /user-pnl figure rather than a sum the site computes from positions.

The cross-venue page pairs Polymarket and Kalshi markets by embedding similarity at a cosine of 0.92 or more, then checks resolution dates and sources, with manual review for high-confidence pairs. Two questions that read alike can still resolve against different sources, which is the check worth repeating yourself.

Integrations

The agent API is a single REST endpoint on Supabase with an action parameter — markets, market, search, trader, whales, leaderboard, categories, stats, the AI-vs-humans list and the arena calls. The AI-vs-humans action outlived its page: on 1 October 2026 it still answered, with a single matched market and a divergence of zero. No key, 60 requests a minute per IP, JSON responses. It answered a keyless request for whale trades and site stats on 30 September 2026.

The MCP server is a Streamable HTTP endpoint, also keyless. A tools/list call against it returned 18 tools on 1 October 2026, including whale trades, market odds and order book, trader profile, positions and activity, price history, news context, resolution status and arbitrage candidates; the site's own skill file still says 8. There is also an llms.txt pair.

One behaviour to design around: llms-full.txt says the UI-facing edge functions return HTTP 200 with an empty object on an internal failure rather than an error, on purpose. Against those, a client cannot tell "no whale trades" from "the backend failed" by status code alone. The agent API is documented differently: its skill file lists 400, 404, 405, 429 and 500 responses, each with a body of { "ok": false, "error": ... }.

Limitations

The picks marketplace is outcome opinion, and that is why the flag is set. It invites traders to "Become an Influencer - Monetize your trading alpha. Set your price…" and sell subscriptions to their picks, with 20% of each paid one going to PolymarketScan. The site's own picks endpoint listed two influencers on 1 October 2026, both priced at $0 with no earnings, carrying 10 and 5 subscribers; the most recent pick was dated 23 July 2026. /picks is in the site map but not in the navigation or the footer. Nothing on a pick places an order: its "Copy Trade" box shows a confirmation toast and sends nothing, because no handler is wired to it, and "Copy all positions" only writes the list to the browser console. The one working copy path leaves the site, a "Copy this trader on Polycool (Telegram)" button that hands you to Polycool. ai_features is set to recommendations because of the marketplace, not because of the explorer, which is plain chain data.

The airdrop estimator is speculation by its own account. It scores wallets on a 1,000-point model calibrated against other protocols' airdrops. Polymarket has confirmed no airdrop, snapshot or formula, and the site says so.

Marketing figures and live figures disagree. The documentation cites 1.35 million wallets and "160+ developers"; the public stats endpoint reported roughly 70 to 160 daily active users a day in the last week of September 2026, and the homepage whale tape read "whale tape unavailable" when we fetched it. Treat the scale claims as the vendor's.

It is paid when you trade. The referral fee is disclosed in the footer and the terms, and the site says its rankings are never paid placements. It is still a reader of Polymarket that earns from sending you to Polymarket.

Polymarket only, for the records. Wallet history exists because Polymarket is on-chain; the Kalshi comparison is prices, not traders.

Nobody named. The terms and privacy policy identify no company, only contact addresses.

Alternatives

OrcaLayer covers the same wallets with published farmer and bot filters and a paid API. Predicts.guru and Polymarket Analytics are the other free wallet readers. For the whale feed across Polymarket and Kalshi together, with scores and a developer tier, see Polywhaler. For raw data rather than a site, Polymarket's Data API is the source much of this is read from.