A $21bn merchant with a payments stack it has outgrown.

Polymarket is not one merchant. It's a regulated US exchange, an offshore crypto venue, and an orchestration relationship — with different buyers, different underwriting profiles, and different odds of a win. Treating it as a single logo is the mistake most vendors will make.

Do not open with "we can beat Checkout.com on rate." Open with the gap their own documentation admits: debit card and ACH deposits take three to four business days to fully clear, and withdrawals follow the same clock. Kalshi returns money to a debit card in about thirty minutes via Visa Direct-style push payments, and also offers PayPal, Venmo and Cash App.

For a prediction market, payout speed is the product. A trader who wins on Sunday and can't touch the money until Thursday does not re-stake on Monday. That is a measurable retention number, and it lands squarely in Travis VanderZanden's lap.

Worldpay's payouts platform — 135 fiat currencies, OCT rails, and stablecoin payouts through BVNK across 180+ markets — closes that gap without touching their acquiring contract. It's an additive first sale. Once you own payouts, you're inside the account for the acquiring conversation at renewal.

Fun is a small, engineering-led team that just raised $72m and is expanding into APAC. It routes global deposits across 50+ methods in 100+ countries. What it cannot build quickly is local acquiring licences, issuer relationships and scheme membership in dozens of markets — which is the thing Worldpay has spent thirty years accumulating.

Sell to Fun as a supplier, not to Polymarket as a competitor. You gain exposure to Polymarket volume plus Aave and Lighter, and you land in an orchestration layer that is going to keep adding merchants.

ICE holds roughly 22% of Polymarket, has taken board-level interest, and its CEO Jeff Sprecher has publicly said the firm may join further rounds. ICE is headquartered in Atlanta. Global Payments — Worldpay's parent since the $24.3bn deal closed on 12 January 2026 — is headquartered in Atlanta. That is a genuine warm-introduction path that no competing acquirer has as cleanly.

It is also the right room for the strategic version of this conversation: ICE's investment thesis is explicitly about data and market infrastructure, not about betting. A payments partner who frames prediction markets as regulated derivatives infrastructure rather than as gaming is speaking ICE's language.

ICE at roughly 22% is the anchor and also a commercial partner — it distributes Polymarket's event data to institutional clients globally. 1789 Capital, where Donald Trump Jr. is a partner, has now put in around $500m across two rounds and led the $21bn round; Trump Jr. also advises Kalshi. The April 2026 round at ~$15bn added D.E. Shaw and G Squared. Founders Fund and Blockchain Capital are earlier backers, and Vitalik Buterin was an early individual investor.

ICE remains the largest single holder at approximately 22%. Its stated thesis is not the betting product — the company told investors the goal is to bring the underlying technology into ICE's own workflow and grow data sales, not to hit a valuation multiple on Polymarket itself.

Read that carefully, because it tells you how to pitch. The most sophisticated money in this cap table thinks of Polymarket as market infrastructure. Payments vendors who show up talking about gambling verticals will be filed accordingly.

Polymarket is a peer-to-peer exchange, not a book. Users buy YES or NO shares priced between $0.00 and $1.00 on a central limit order book; winning shares redeem at $1.00 and losing shares expire worthless. The house never takes the other side, so revenue scales with volume rather than with user losses — a materially different risk profile from a sportsbook, and a useful line when your own risk team asks.

The global venue runs on Polygon using the Conditional Token Framework, with resolution via UMA's Optimistic Oracle (moving to a managed, whitelisted-proposer version). Polymarket US runs as a conventional intermediated derivatives exchange under CFTC rules.

Their documentation exposes the integration shape, which tells you how deeply the incumbent is embedded and how a second acquirer would slot in:

• POST /v1/checkout/payment-sessions — card tokenisation session
• POST /v1/checkout/instruments — save tokenised card as a reusable instrument
• POST /v1/checkout/deposits · POST /v1/checkout/withdrawals
• POST /v1/aeropay/initialize · /validate-mfa · /methods · /deposits · /withdrawals
• GET /v1/funding/sources · /accounts · /transactions · /transaction-requirements

Two things worth noting. First, funding-source types are enumerated as FUNDING_SOURCE_TYPE_CHECKOUT_CARD and FUNDING_SOURCE_TYPE_AEROPAY_BANK_ACCOUNT — provider names are baked into the enum, which means adding a second acquirer is a schema change, not a config change. That's friction, and you should scope it honestly rather than pretend it isn't there. Second, there is a generic FUNDING_SOURCE_TYPE_BANK_ACCOUNT alongside the Aeropay-specific one, which hints at an abstraction they may already be building toward.

Lead with the range, not the point estimate. On US-only defaults the account sizes in the low single-digit millions of annual net revenue — respectable but not headline. The number that justifies senior attention is the compound one: US acquiring plus US payouts plus a route inside Fun's global book plus stablecoin settlement, against a merchant growing volume at triple digits year on year with two demand catalysts in the next ninety days.

Be explicit that the deposit-to-trading ratio is an assumption. Offering to refine it with the merchant is itself a discovery question that makes you look like an analyst rather than a vendor.

Polymarket US operates as a CFTC Designated Contract Market through QCX LLC, with QC Clearing LLC as the registered clearinghouse. That places it in the same regulatory tier as CME: segregated customer funds, market-manipulation surveillance, mandatory KYC, and continuous CFTC rule enforcement review. The Amended Order of Designation of 25 November 2025 permits operation as an intermediated trading platform.

The federal posture has moved decisively in the industry's favour. CFTC Chairman Michael Selig announced the agency would withdraw its prior proposed bans and advisories and draft comprehensive prediction-market regulations — regulate rather than restrict. The CFTC has actively sued states (Arizona, Connecticut and Illinois in April 2026) to block enforcement against federally listed event contracts, and won a federal injunction against Tennessee.

The structural fact underneath all of this: Polymarket holds no affirmative gambling or e-money licence in any jurisdiction outside the US. The global platform operates from Panama on crypto rails and responds to national regulators by geo-blocking, not by licensing. Restrictions come in three flavours — mandatory OFAC blocks, national gambling-regulator enforcement, and "close-only" mode where existing positions can be closed but no new trades opened.

Kalshi raised at $22bn in May 2026, has generated an estimated $1.5bn in annual revenue, and claimed $100bn in annualised trading volume in January 2026. It has outrun Polymarket for much of the year on operational and legal execution. Donald Trump Jr. advises both companies.

Robinhood partnered with Kalshi and is now building its own venue with Susquehanna, acquiring a controlling stake in MIAX-linked exchange infrastructure, expected to launch later in 2026. Coinbase rolled out Kalshi-based markets in December 2025. Crypto.com, DraftKings Predictions, FanDuel Predicts, Novig and OG Prediction Markets are all in the field. PredictIt is winding down.

The strategic point for you: prediction markets are becoming a payments category, not one account. Every incumbent brokerage and sportsbook is building or partnering into it. If you build the reference architecture for regulated event-contract payments — instant payouts, state-level geo-controls, stablecoin settlement, correct MCC handling — Polymarket is the first logo, not the only one.

1. What's your deposit-to-trading-volume ratio? Everyone sizes you off trading volume and gets it wrong by ten times.
2. What proportion of first-time depositors abandon at the card step, and what's your auth rate by issuer?
3. Your docs say card and ACH withdrawals clear in three to four business days. What does that do to seven-day repeat-stake rates versus your instant-payout competitors?
4. The funding-source enum has provider names baked in. How much engineering is a second acquirer, honestly — and would an abstraction layer be worth building before the midterms rather than after?
5. Are you running debit least-cost routing? On a US debit-heavy book that's real basis points you may be leaving on the table.
6. Where do card deposits sit in your chargeback ratio, and how much of that is friendly fraud after a losing position?
7. Is Polymarket US credit-card-enabled, or debit-only in practice? Your documentation and your help content disagree.
8. When Android and web launch, are you carrying the same single acquirer into a browser flow with a completely different fraud profile?
9. How are you MCC-coded today, and has that been tested with issuers across all forty-plus states?
10. If the global exchange reopens to US traders, does that funding flow stay on crypto rails or does it need fiat acceptance at US scale?

• MCC classification is genuinely unsettled. Is this 6211 securities-broker traffic or 7995 gambling? Polymarket US argues federally regulated derivatives, and the CFTC licence supports that. Several state regulators argue unlicensed sports betting. The classification drives interchange, issuer decline behaviour and scheme-rule exposure — and the answer may differ by state. Get this decided internally before you quote anything.
• Issuer blocking. Many US issuers decline or cash-advance-code 7995. If the merchant is coded as gambling, your auth-rate pitch gets harder, not easier.
• Chargebacks. Funding a trading account by card invites friendly fraud after losses. Model a higher dispute rate than a typical ecommerce merchant.
• State patchwork. Processing must be geo- and BIN-controlled, and the permitted map moves. Nevada is banned today; the Ninth Circuit could widen that.
• Panama entity. Adventure One QSS with no universal KYC is realistically unbankable for a bank-sponsored acquirer. Scope it out explicitly.
• UBO opacity. NPR reporting and congressional interest in undisclosed ownership will slow KYB. Start early.

• Open CFTC inquiry into marketing and consumer protection, reported July 2026, following WSJ reporting on creators recording simulated trades on counterfeit versions of the site targeted at US audiences.
• Insider-trading coverage. New York Times reported dozens of markets showing signs of insider trading; House Oversight has requested documents including on Venezuela and Maduro-related contracts.
• Political entanglement. 1789 Capital leads the latest round with Donald Trump Jr. as a partner; he simultaneously advises Kalshi. House Judiciary Democrats have been scrutinising the relationship. No findings of wrongdoing have been reported. Your comms and government-relations teams should have a considered position rather than being surprised.
• Gambling-adjacent perception. Twelve or more national regulators formally classify this as unlicensed gambling. Whatever the CFTC says, some of your bank partners will read those headlines first.

• Deposit volume may be far smaller than trading volume suggests. The whole business case rests on a ratio nobody outside the company knows.
• Crypto substitution. Every dollar that arrives on-chain is a dollar that never touches a card. The company actively steers heavy users toward exchange transfers because card fees are higher — their own help content says so.
• pUSD and an own L2 push more of the flow on-chain over time, structurally shrinking the card-addressable share of the global book.
• Incumbent defence. Checkout.com serves both Polymarket and Kalshi and will fight to keep the category.

It's a single self-contained HTML file with no build step and no dependencies beyond the Google Fonts link. Open it in any text editor.

• Add a fact: find the relevant <section class="pane"> and add a table row or paragraph. Attach a confidence chip with <span class="cf hi">0.95</span> — classes are hi, med, low, neg.
• Add a section: copy an existing <section class="pane" id="p-yourid"> block and add a matching <a class="nv" data-p="yourid"> in the left rail. The navigation wires itself up from data-p.
• Status tags in tables: t-live green, t-block red, t-part amber, t-neut grey.
• Callout boxes: <div class="call win|warn|note">.
• Search indexes the DOM automatically — new content becomes searchable with no extra work.
• Notes save to browser local storage per section, on that browser only. They are not shared and not backed up. Copy anything important out before you change machines.

When you publish a new version, rename the file with a new version and date so you don't overwrite the previous deploy — browsers will otherwise serve you a cached or duplicated copy.

1. Create a folder, drop this file in, and rename it index.html.
2. In the Cloudflare dashboard: Workers & Pages → Create → Pages → Upload assets.
3. Drag the folder in, name the project, deploy. No build command, no framework preset.
4. For future updates, upload a new deployment of the same project. Cloudflare keeps every previous deployment at its own preview URL, which gives you free version history.
5. If it's going anywhere semi-public, put Cloudflare Access in front of it — this document has enough internal positioning in it that you don't want it indexed.

• CFTC decision on reopening the global exchange to US traders
• Ninth Circuit ruling on Nevada, and any circuit split or cert petition
• Polymarket US Android and web launch
• Any new payment method appearing in docs.polymarket.us — the funding-source enum is the tell
• Fun's APAC launch and any acquisition announcement
• Further ICE participation, or an IPO signal