Based

Based is a self-custodial super app that lets a trader hold crypto, trade spot and perpetual positions on Hyperliquid, and browse Polymarket prediction markets from a single account. The wallet spans web, iOS, Android and desktop, and a trader never hands custody of assets to the operator; sign-in runs through an email or a Google account via Privy, and the private keys stay with the user. A Based Visa card lets that same balance get spent at merchants directly from the app.

On Polymarket specifically, Based operates as a routing wallet rather than a market itself: order flow tagged to its builder code currently sits at #29 on Predicts.guru's leaderboard by all-time attributed volume, with $28.8M routed since 2026-04-23 and sports the largest category traded over the last thirty days. That flow moves through the wallet's Polymarket surface, sitting alongside the Hyperliquid terminal and card spending rather than as a separate app.

A trader signs up with an email or Google account through Privy, which generates a self-custodial wallet rather than an exchange account; connecting an existing wallet is also supported. From that single account, Based exposes separate surfaces for Hyperliquid perpetuals and spot trading and for Polymarket's prediction markets, so a trader moves between the two without a separate login or a new deposit.

Orders placed against Polymarket markets route through Based's own builder code before reaching Polymarket's central limit order book, and the CLOB, not Based, matches and settles the trade. Based's role stops at routing and display: the app streams odds, volume and liquidity for each market and mirrors the trader's prediction balance next to their trading account so moving funds between the two is instant, but the matching engine and the market itself belong to Polymarket.

Custody stays with the trader throughout. Based states plainly that it does not hold user keys and cannot move funds on a trader's behalf, so a wallet compromise or an operator failure is not the same exposure as it would be on a custodial exchange; the tradeoff is that recovery of a lost key is also the trader's own problem, not a support ticket.

• Staking for fee discounts

  Staking the BASED token unlocks trading fee discounts across both Hyperliquid and Polymarket, so a trader willing to hold it can lower the cost of routing through Based over time.

• Instant balance transfers

  The prediction balance sits alongside the trading account, so moving funds between Polymarket positions and Hyperliquid trading is immediate rather than a withdrawal and a new deposit.

• Advanced perpetual order types

  Scale, scalp, TWAP and trailing stop loss orders are built for the Hyperliquid side of the app, giving active traders more control than a simple market or limit order.

• PnL calendar and leaderboard

  A calendar view tracks closed profit, fees and profitable days by month, and a seasonal leaderboard lets a trader benchmark performance against others on the platform.

Self-custody-focused wallet traders

Anyone unwilling to hand keys to a custodial exchange gets a single wallet that trades crypto, prediction markets and spends card balances without giving up control.

Cross-market perpetuals and predictions traders

Traders who already use Hyperliquid for leverage can add Polymarket positions from the same account instead of juggling a second app and a second deposit.

Mobile-first retail traders

With fills averaging $322, the flow through Based looks closer to a retail-sized account than a desk, which suits someone sizing positions for a personal book.

Traders opening new positions

With 74.5% of routed volume opening rather than closing a position, Based's Polymarket flow looks like an entry point more than an exit venue for this cohort.

Users who want to spend crypto directly

The Based Visa Card lets a trader spend balances at merchants worldwide without a separate off-ramp, useful for someone who wants trading and spending in one account.

Withheld: this builder's figures have moved out of the range the written assessment was made against. The measurements above are live; the assessment returns with the next editorial pass.

Withheld: this builder's figures have moved out of the range the written assessment was made against. The measurements above are live; the assessment returns with the next editorial pass.

Based is self-custodial by its own account: the operator states it does not hold user keys and cannot move funds without the trader's action, so a platform-level failure does not automatically mean lost funds the way it would on a custodial exchange. The tradeoff sits with the trader, who becomes solely responsible for key recovery and for whichever login method, email or Google account through Privy, guards access to the wallet. Transparency on Polymarket-specific terms is thin: the operator does not publish a routing fee rate, so a trader relies on the order ticket rather than the product pages for the actual cost of each trade.

Withheld: this builder's figures have moved out of the range the written assessment was made against. The measurements above are live; the assessment returns with the next editorial pass.

• What is Based?

  Based is a self-custodial super app that lets a trader hold crypto, trade Hyperliquid perpetuals and spot markets, browse Polymarket prediction markets and spend balances with a Visa card, all from one wallet across web, mobile and desktop.

• Is Based safe to use for Polymarket trading?

  Based never takes custody of trading funds, since the wallet is self-custodial and keys stay with the trader, but that also means a lost login or seed recovery is the trader's own responsibility rather than a support ticket.

• What are Based's fees for trading on Polymarket?

  Based does not publish a dedicated fee rate for its Polymarket order flow; it advertises staking-based discounts on trading fees across Hyperliquid and Polymarket, but the actual rate a trader pays should be checked in the order ticket.

• What are the alternatives to Based for trading Polymarket?

  Any Polymarket-verified builder with its own attributed volume and trader cohort is an alternative; the deciding factors are whether it holds funds, what it publishes about cost and whether its audience matches a trader's own fill size.

• Does Based hold custody of a trader's funds?

  No. Based describes itself as self-custodial by default, meaning the operator does not hold private keys and cannot move a trader's assets, which shifts both control and recovery responsibility onto the trader.

• How does a trader connect Based to Polymarket?

  A trader signs into Based with an email or Google account through Privy, which creates a self-custodial wallet, then uses the app's prediction markets surface to browse and trade Polymarket markets from that same account.