mass

Mass is a self-custodial mobile app, available on iOS and Android, that bundles crypto trading, Hyperliquid perpetual futures, tokenized stocks and Polymarket prediction markets into one account. Traders sign up with a Google or Apple account rather than a lengthy setup, and can trade without completing KYC unless they want to move fiat to a bank or order a debit card. The operator positions Mass as a substitute for juggling a separate wallet, exchange and browser tab for each market.

Inside Mass, Polymarket sits behind a dedicated prediction account reached by bridging funds from the app's other balances. On Predicts.guru's own index, Mass ranks #175 among builders by all-time attributed volume, with 3 distinct wallets routing through it on a typical day and its heaviest recent flow landing in bitcoin, led by the market Will Bitcoin reach $90,000 in August.

A trader reaches Mass by installing the app and signing up with a Google or Apple account, without a separate seed-phrase setup beyond the wallet Mass generates. Funding comes from a card, a SEPA transfer, or a stablecoin deposit from an exchange such as Kraken, Binance, Revolut or Robinhood. Cashing out works the same way in reverse, through a SEPA transfer back to a bank account.

Once funded, a trader taps into the prediction tab, bridges balance into a dedicated prediction account, and places orders that route to Polymarket's order book under Mass's own builder code, the same book every other Polymarket front end reads from. The same underlying balance can be split across that prediction account, a separate perps account for Hyperliquid, and stock and crypto holdings, moved between them in the app rather than withdrawn and redeposited on each market.

Mass describes itself as non-custodial across these accounts: the operator says it never takes custody of user assets, and its smart contracts have been through independent audits more than once. That leaves the trader holding the keys, but it also means the fills, the bridging step and the account balances all depend on Mass's own infrastructure staying up and its bridge working as described.

• Bridge into a prediction account

  Funds move from the app's main balance into a dedicated Polymarket account in the app, so a trader does not need a separate wallet or browser session to place a bet.

• Hyperliquid perps in the same app

  The same login trades Hyperliquid perpetual futures with high leverage, so a trader can size a directional crypto bet next to a Polymarket position without leaving the app.

• Cash in and cash out

  Fiat moves in by card or SEPA transfer and back out to a bank account the same way, so a trader can settle winnings without routing through a separate exchange first.

• Saving plans on idle balance

  Uninvested balance can sit in a saving plan that pays a published annual rate instead of earning nothing between trades, though the rate applies to the whole app, not to Polymarket positions.

Mobile-first crypto traders

Traders who already hold crypto on their phone can add Polymarket bets, Hyperliquid perps and stocks to the same account instead of installing another app for each market.

Non-KYC stablecoin holders

Traders who deposit stablecoins from an exchange such as Kraken or Binance can trade without completing KYC, as long as they never cash out to a bank.

Traders who also run Hyperliquid perps

Anyone trading Hyperliquid perpetual futures on mobile can add a Polymarket position from the same balance without switching to a browser or a separate perps app.

Traders who want cash-out speed

Traders who plan to convert winnings straight to a bank account benefit from a built-in SEPA cash-out instead of routing through a separate off-ramp first.

New crypto users avoiding wallets

People who do not want to manage a browser wallet can sign up with a Google or Apple account and get a self-custodial wallet created for them.

Mass publishes no fee schedule of its own for Polymarket trades; the operator's documentation covers fees for its crypto, perps and stock products but does not spell out a rate for predictions specifically. Polymarket's own trading fee is set per market and applies the same way no matter which builder routes the order, so it is not something that separates Mass from any other front end.

Before funding an account, a trader should check Mass's fee documentation directly for perps funding rates, card and SEPA charges, and any spread on the crypto-to-stablecoin conversion used to bridge into the prediction account, since those costs sit outside Polymarket's own fee and are the ones Mass actually controls.

• It bundles Polymarket predictions, Hyperliquid perps and tokenized stocks into one self-custodial account, so a trader does not need separate wallets for each market.
• Funding and cash-out both run through SEPA and card rails inside the app, which shortens the path between fiat and a live position.
• No KYC is required to trade as long as funding comes from stablecoins rather than a bank transfer, which suits traders who want to stay off the KYC rail.
• The operator states that Mass never takes custody of user funds and that its smart contracts have been through independent audits more than once.
• A trader already active on Hyperliquid or in tokenized stocks gets Polymarket exposure without opening a dedicated prediction terminal.

• Mass states no fee schedule for Polymarket trades, so a trader has no published rate to compare before routing an order.
• Mass ranks #175 by all-time attributed volume, and it averages 3 distinct wallets a day, a pattern that points to a small, concentrated cohort rather than a broad crowd of traders.
• Mass has been live for 147 days on Predicts.guru's index, which is not enough time to have been tested through a full market cycle.
• Bridging funds between the crypto, perps, stock and prediction accounts adds a step and a dependency on Mass's own infrastructure that a direct Polymarket connection would not have.
• Google Play's own data safety disclosure states the app shares personal and financial data with third parties and does not encrypt data at rest.

Mass is self-custodial: the operator states it never takes custody of user funds, and its smart contracts have been through independent audits more than once, with the audit list published on its own site. Transparency stops at the fee level, since Mass states no rate for Polymarket trades specifically. Operationally, a trader's position depends on more than Polymarket's own infrastructure: it also depends on Mass's bridge between its accounts staying available, and on an app that, per its own Play Store listing, shares personal and financial data with third parties and does not encrypt data at rest.

Mass is worth routing money through if the appeal is one account for crypto, perps, stocks and Polymarket bets rather than the sharpest possible venue for any single one of them. Its self-custodial design and built-in cash-out are real conveniences, and audits back the custody claim, but it currently ranks #175 by attributed volume with 3 wallets trading through it on a typical day, and it states no fee schedule for predictions. Traders who want a single mobile app for everything should try it; traders who trade Polymarket exclusively and want the deepest, most transparent venue should look elsewhere first.

• What is mass?

  Mass is a self-custodial mobile app that combines Polymarket prediction markets with Hyperliquid perps, tokenized stocks and a cash wallet in one account, reached through the iOS or Android app rather than a browser.

• Is mass safe to use for Polymarket trading?

  It is self-custodial and its smart contracts have been through independent audits more than once, but the app's own data safety disclosure states it shares personal and financial data with third parties and does not encrypt data at rest.

• What are mass's fees?

  Mass states no fee schedule for Polymarket trades specifically, though it documents fees for its crypto, perps and stock products separately. Polymarket's own trading fee applies the same way regardless of which builder routes the order.

• What are alternatives to mass for trading Polymarket?

  Any Polymarket-verified builder that publishes its own front end works as an alternative; the choice usually comes down to whether a trader wants a dedicated prediction terminal or an all-in-one app that also covers perps and stocks.

• How does mass connect to Polymarket?

  A trader bridges balance from the app's main account into a dedicated prediction account, and orders placed there route to Polymarket's order book under Mass's own builder code.

• Does mass require KYC?

  No KYC is required to trade if funding comes from a stablecoin deposit; KYC is only triggered by moving fiat to a bank account or ordering a debit card.