Portex

Portex is a Polymarket builder, a third-party access point that tags the trades routed through it with its own builder code so Polymarket can credit the volume separately from any other app. Polymarket lists Portex's profile as verified, though the operator itself sits in a catch-all category on our index rather than a clearly defined product line. Attributed volume through 2026-09-14 stands at $12.9M for a leaderboard placement of #46, with $1.4M routed in the last seven complete days.

The flow behind that number comes from a cohort of 480 wallets, averaging 48 distinct traders a day rather than one account cycling through repeated fills. Buy share sits at 92.4% of routed volume, so the venue works mainly as an entry point into new positions. Most of that flow landed in Politics markets over the last thirty days, led by Will there be no change in Fed interest rates after the September 2026 meeting, and the first attributed fill dates back to 2026-06-23.

A trader who wants Portex counted as the source of their flow has to originate the order through whatever interface Portex provides rather than trading directly on Polymarket's own site. The operator does not publish what that interface looks like, so a trader should confirm for themselves whether it is a standalone app, an extension, or something layered on top of an existing wallet before connecting funds.

Once an order is placed, it routes into Polymarket's central limit order book on Polygon tagged with Portex's builder code, which is how Polymarket and our index credit the resulting volume to Portex rather than to Polymarket's own interface or to a different builder. That routing step is what lets $12.9M in attributed volume and 61.7K in fills accumulate against Portex's name specifically, separate from whatever else the same wallet trades elsewhere.

Portex does not state how it handles custody during that process, whether positions or collateral ever sit with the operator rather than the trader's own wallet at any point. A trader sizing up should resolve that question directly with the operator before committing funds, since neither a fee schedule nor a custody statement appears anywhere in what Portex publishes.

• Small, frequent order fills

  Fills have averaged $209 across 61.7K trades, a size that suits building or trimming positions gradually instead of moving a market in one order.

• Entry-heavy order flow

  Buy share sits at 92.4% of routed volume, so the venue is used mostly to open new positions rather than to close out existing ones.

• Crowd-sized daily activity

  A cohort of 480 wallets and 48 traders a day means volume comes from a spread of accounts rather than one wallet cycling fills.

• Continuous activity since launch

  Portex shows routed volume as recently as 2026-09-14, following a first fill on 2026-06-23, giving a trader 84 of history to check rather than a cold start.

Traders sizing small positions

Average fills near $209 fit a trader working in increments rather than placing a single large order into a thin book.

Traders opening new positions

Buy share at 92.4% suits someone entering markets more than someone hedging or closing out an existing book through the same venue.

Political-market traders

The last thirty days concentrated in Politics, led by Will there be no change in Fed interest rates after the September 2026 meeting, so a trader focused on that theme finds established flow to trade alongside.

Traders who verify pricing first

Anyone who insists on a stated fee before committing size should treat the operator's published silence as a reason to confirm costs independently beforehand.

Traders new to this builder

With 84 of history and a cohort of 480 wallets, a newcomer can gauge whether flow here looks steady before routing size through it.

Portex publishes no fee schedule of its own, so the only pricing signal available is the measured trader fee our index calculates from what traders actually paid on CLOB V2, expressed as trader-paid fees over attributed volume. That figure reflects blended market conditions across everything routed through Portex, not a rate the operator has committed to.

Polymarket's own trading fee is set per market and applies the same way regardless of which builder routes the order, so it never varies by builder and says nothing about what Portex specifically charges on top of it, if anything. A trader who wants certainty here has to ask Portex directly before routing size, since nothing published settles the question.

• Portex carries a verified profile on Polymarket, a baseline confirmation of registration that rules out an entirely unlisted or spoofed builder code.
• Fill sizes average near $209, small enough for a trader to scale in and out without moving the market against themselves.
• Volume comes from a genuine cohort, 480 wallets and 48 traders a day, rather than one account inflating the numbers.
• Buy share of 92.4% makes it a reasonable venue to open new positions in markets where its flow concentrates.
• The venue has 84 of trading history through 2026-09-14, long enough to see whether flow holds up week to week rather than judging it on a single spike.

• The operator publishes no fee schedule, leaving a trader to estimate cost from measured averages rather than a stated rate.
• Weekly volume moved by +2768.9% against the prior week, a swing size that makes a typical week hard to define.
• At 84 days since the first attributed fill, the venue has not yet traded through a full market cycle.
• Buy share leans heavily toward opening trades, so a trader planning to route exits through the same venue may find the flow thinner going the other direction.
• Portex sits at #46 by attributed volume on our leaderboard, a measure of flow size rather than execution quality or reliability.

Portex carries a verified profile on Polymarket, which confirms the builder's registration but says nothing about how it handles funds in transit or what data it keeps on its users. The operator states no custody arrangement and no fee rate, so transparency does not keep pace with the volume it already routes.

Operational exposure comes down to trusting order handling between wallet and Polymarket's order book without published detail on how Portex manages that step, so a trader should size positions with that uncertainty in mind rather than assume standard protections apply by default.

Portex functions as a working Polymarket builder with a real, if modest, base of daily traders and a fill pattern that looks retail rather than institutional. The absence of any published fee schedule is the detail that should give a careful trader pause, since it means pricing has to be confirmed independently rather than taken from a rate card.

A trader comfortable sizing positions near $209, mostly to open rather than close, and willing to verify costs before committing funds, has reasonable grounds to route flow through it. A trader who needs a stated fee up front or wants a long track record through more than one market cycle should look elsewhere first.

• What is Portex on Polymarket?

  Portex is a builder that routes trader order flow into Polymarket under its own builder code, letting Polymarket and independent trackers credit that volume separately from other apps trading on the same order book.

• Is Portex safe to use?

  Portex carries a verified profile on Polymarket, but the operator publishes no fee schedule and no statement on custody, so a trader should confirm both before routing meaningful size through it.

• What does Portex charge in fees?

  Portex does not publish a fee schedule, so the only pricing signal is the trader-paid rate our index measures from actual fills, which reflects blended conditions rather than a committed rate.

• What are the alternatives to Portex?

  Any other Polymarket builder that publishes its own volume figures is a comparable option, and Portex currently sits at #46 on our leaderboard, a starting point for comparing flow and cohort size before choosing.

• How does Portex work?

  A trader routes an order through Portex's own access point, which tags the trade with its builder code before it reaches Polymarket's central limit order book, letting the resulting volume be credited to Portex specifically.

• How long has Portex been active?

  Portex's first attributed fill landed on 2026-06-23, putting it at 84 days of measured history through 2026-09-14, which is enough time to see a pattern but not yet a full market cycle.

• Who typically trades through Portex?

  The trader cohort behind Portex runs 480 wallets with 48 active on an average day, fills that average near $209, and a buy share of 92.4%, a mix that points to smaller accounts opening positions rather than large desks managing an existing book.