Synthesis.Trade

Synthesis.Trade is a web-based trading terminal that lets a trader work Polymarket and Kalshi markets from one screen, combining a Trade view, a Multiview layout for tracking several markets side by side, a Discover feed, a Copytrade panel and a Portfolio section for open positions. The operator, Ryne Labs, also runs an API that other developers use to create wallets, place orders and stream balances, order books and trades, so the same routing infrastructure underlies both the public site and third-party products built on top of it.

Its market pages show a live order book, trade history and a candlestick chart spanning ranges from one hour to all time, the same book depth Polymarket itself exposes on that market. Its terms describe the site's content features as news and information about global events, treating trading itself as a separate technology feature that requires connecting a wallet and that is unavailable to users in a defined list of restricted jurisdictions.

A trader connects a self-hosted wallet to synthesis.trade rather than depositing funds with the operator; the terms treat trading as a Technology Feature that requires linking that wallet through the interface, kept separate from the site's news and market-data content. Orders placed from the Trade screen route to Polymarket's or Kalshi's own order book, so settlement and custody of positions stay on the underlying venue's contracts rather than with Synthesis.

Behind the consumer site sits an API that other developers can use directly: project API keys manage backend accounts, session tokens or account API keys authenticate a signed-in user, and endpoints stream balances, order books and trades in real time. The same routing layer that powers the public terminal also powers wallets and orders created programmatically by whoever integrates that API, so a position opened through a third-party app built on Synthesis can end up on the same books as one opened from the Synthesis site itself.

Its terms bind users of the Site to Polymarket's and Kalshi's own terms of service and apply whichever set is more restrictive whenever the two conflict, a reminder that the underlying exchanges, not Synthesis, hold the funds and settle each trade.

• Multiview market layout

  Lets a trader track several markets side by side on one screen, so timing entries across correlated events does not require tab switching or missing a move elsewhere.

• Discover market feed

  Surfaces markets across Polymarket and Kalshi in one browse screen, useful for a trader hunting new setups rather than one who already knows what to trade.

• Copytrade mirroring panel

  Lets a trader mirror another wallet's positions from inside the terminal, though the copied wallet's result is its own and carries no guarantee for the follower.

• Multi-range candlestick charts

  Switches between one-hour and all-time views on the same market, giving a trader context on how a price moved before deciding to size a fill.

Traders active on both venues

Someone who already trades Polymarket and Kalshi gains one login and one order screen instead of juggling two separate sites for the same thesis.

Copy traders following other wallets

A trader who wants exposure to another wallet's positions can route through Copytrade rather than watching that wallet's activity manually and re-entering trades by hand.

Developers building on prediction markets

A team building its own product can use the Synthesis API to create wallets, place orders and stream data instead of integrating each venue separately.

Traders scanning for new markets

Someone without a fixed watchlist can use Discover to browse markets across both venues rather than searching each platform's own listings by hand.

Traders outside restricted jurisdictions only

The terms block trading access from a defined list of countries, so this fits a trader confirming eligibility first rather than assuming access anywhere.

Synthesis.Trade does not publish a fee schedule for routing through its terminal or its API; the operator states no rate on either its market pages or its documentation. Polymarket's own trading fee is fixed per market and applies the same regardless of which builder routes the order, so it is not something this tool sets and not a way to compare it with another terminal. Before sizing a position, a trader should confirm through the connected wallet what Polymarket or Kalshi charges on that specific market, and check whether Synthesis layers anything on top at the point an order is placed, since the terms do not address that separately from the underlying venue's own fee.

• Combines Polymarket and Kalshi order flow in a single terminal, cutting the need to run two separate sites for the same trade thesis.
• Offers an API for developers who want to build their own wallet, order and data integration rather than relying on the consumer site alone.
• Includes a Copytrade panel that lets a trader mirror another wallet's activity without manually rebuilding each position.
• Runs on self-hosted wallets connected through the interface rather than requiring a deposit held by the operator.
• Provides multi-range candlestick charting from one-hour to all-time views on the same market page.

• Publishes no fee schedule anywhere on its site or documentation, leaving a trader to discover any added cost only after connecting a wallet.
• Restricts trading access across a defined list of jurisdictions, so a trader has to confirm eligibility before assuming the terminal will work for them.
• Its leaderboard rank by all-time attributed volume sits at #47, a figure worth checking against other builders before routing size through it.
• Ties disputes to whichever of its own terms or Polymarket's and Kalshi's terms is more restrictive, adding legal complexity beyond using either venue directly.

Synthesis.Trade does not hold trader funds directly; its terms describe trading as a feature that requires connecting a self-hosted wallet, keeping custody and settlement on Polymarket's or Kalshi's own contracts rather than with the operator, Ryne Labs. That structure limits exposure to the terminal itself failing, but the terms also fold in both underlying platforms' terms of service and apply whichever set is more restrictive in a conflict, adding legal surface beyond either venue alone. The operator states no fee schedule, so transparency on cost sits with whatever the connected wallet shows at the point an order is placed, not with anything Synthesis publishes upfront.

Synthesis.Trade works best as connective tissue for a trader who already splits activity between Polymarket and Kalshi and wants one screen and one wallet connection instead of two. The Copytrade panel and the underlying API add reach beyond a plain terminal, letting a builder or a follower route through the same infrastructure. What it does not offer is a stated cost: with no fee schedule published, a trader has to verify pricing independently before committing size, and the jurisdiction restrictions mean it is not available to everyone who might otherwise want it. It suits multi-venue traders and API-minded builders; it does not suit anyone who needs pricing certainty upfront.

• What is Synthesis.Trade?

  It is a web-based trading terminal that routes orders into Polymarket and Kalshi from one account, combining a Multiview layout, a Discover feed and a Copytrade panel with an underlying API.

• Is Synthesis.Trade safe to use?

  It does not hold funds itself; trading requires connecting a self-hosted wallet, so custody stays on Polymarket's or Kalshi's own contracts rather than with the operator, Ryne Labs.

• What are Synthesis.Trade's fees?

  The operator publishes no fee schedule on its site or its documentation, so a trader should confirm any added cost through the connected wallet before sizing a position.

• Does Synthesis.Trade support copy trading?

  Yes, its Copytrade panel lets a trader mirror another wallet's open positions from inside the terminal, though the copied wallet's trading result remains that wallet's own and carries no guarantee.

• Can developers build on Synthesis.Trade?

  Yes, its documented API lets a developer create wallets, place orders and stream balances, order books and trades for a separate product built on the same routing layer.

• What alternatives exist to Synthesis.Trade?

  Its leaderboard rank, #47 by attributed volume, shows how much order flow moves through it relative to other Polymarket builders, a useful comparison point before choosing between terminals.

• Where can Synthesis.Trade be used?

  Its terms block trading access from a defined list of restricted jurisdictions including the United States, so eligibility should be confirmed before assuming the terminal works everywhere.