Arkham Alternative: A Trader Grade Against Wallet Deanonymization

Arkham's own framing is blunt: 'Arkham deanonymizes prediction markets. Every trader on Polymarket has a track record - we show it to you.' It sits inside a much larger on-chain intelligence platform that also covers token flows, exchange balances, and other chains.

arkm.com, its predictions page, its home page, and its pricing page all returned an HTTP 403 Cloudflare challenge to every fetch attempted for this review on 2026-09-17. The facts here come from Arkham's other public surfaces: its announcements blog, its API documentation, and its sitemaps.

Arkham's core differentiator is identity, not just activity. It says it has built 'the largest catalogue of deanonymized on-chain traders on Earth, with over 3.5 billion address labels and 800,000 Verified Arkham entities,' and its Visualizer and Tracer tools map a wallet's transactions across every address it controls, on any chain Arkham covers. Twenty-plus published Polymarket tags include potential-insider, fresh-wallet, resolution-sniper, bot, market-maker, early-mover, and tags for soccer, NFL, NHL, NBA, and MLB traders specifically.

0xinsider tracks a wallet by its Polymarket address. It does not attempt to link that address to a real-world identity, and it publishes no behavior-tag taxonomy comparable to Arkham's.

Arkham's Elo-style rating, launched 2026-06-29, ranks 'traders based on prediction accuracy,' rewards a correct call at longer odds more than one at short odds, and by its own description 'does not take bet sizing into account.' The exact formula (its K-factor, its starting rating) is not published. Arkham's own figures for the top-ranked trader (a 64.3% win rate over 2,644 bets, an Elo of 2389) differ from a 66.1% win-rate figure attributed to the same wallet in third-party press coverage, which appears to reflect a different snapshot.

0xinsider's grade is about 95% realized (banked) profit, with eligibility floors that do real work: anything above a C needs verified net-positive realized profit, and the top three grades also need a real resolved-market count and a survivable worst drawdown. Every graded wallet also carries the full risk-metric set: Sharpe, Sortino, drawdown, expectancy, VaR, and Kelly fraction, none of which appear in Arkham's published wallet-summary fields.

Arkham's alerts fire by email, Telegram, and webhook, customizable by address, entity, position size, and token type, on top of the behavior tags above. Its API also exposes order-book and top-holder endpoints for individual Polymarket markets.

0xinsider's Insider Radar publishes statistical flags with the wallet, market, and timestamp attached, and today's alerts run by email on the wallets and markets a reader names.

Arkham's own web-app pricing could not be checked behind the Cloudflare challenge. Its API is usage-based, described as 'custom-built' and starting at $100/mo in credits, with individual Polymarket endpoints costing 1 to 2 credits each, plus an x402 pay-per-request option at $0.20 per credit.

0xinsider's free account includes the full trader leaderboard, full trader profiles with Insights, the previous day's large trades, and one Pick of the Day. Pro adds the live large-trade feed, custom alerts, Insider Radar, the REST API and MCP server, and in-game position changes while a game is live. Current plans are on the pricing page.

Use Arkham if the job is identity: linking a Polymarket wallet to a real-world entity, tracing its fund flows across chains, or filtering by a published behavior tag.

Use 0xinsider if the job is a sports and esports grade with a published, floor-gated method and a full risk-metric set, reachable without a bot-verification challenge.