Agg is prediction market aggregator built to give users the best prices, deepest liquidity, and widest selection across every prediction market from a single interface, building Kayak for prediction markets. One click. Best price. Every time. 

Its consumer app, agg.market, lets anyone compare and trade the same event across 6+ leading venues, including Polymarket, Kalshi, and Limitless from a single interface, optimizing every trade for users. Behind the app sits Agg’s prediction infrastructure, which any app or website can integrate to launch differentiated prediction products in days.

To make multi-venue, multi-chain trading feel as simple as a single tap, Agg built its entire wallet layer on Portal’s Enclave MPC API.

The Challenge

Prediction markets are fragmented across venues and blockchains. The same event on Polymarket (Polygon) also exists on Kalshi (Solana), and Predict.Fun (BNB). For a normal user, trading across venues would require managing both stablecoin and gas token balances across multiple chains, bridging funds, and signing transactions at every step. That friction keeps prediction trading siloed by venue. 

Agg’s goal was to abstract blockchain technology to make multi-venue trading seamless for any user. Delivering that required non-custodial wallet infrastructure that could be provisioned invisibly across both EVM chains and Solana, and sign on the backend at scale. 

How Agg uses Portal

1. Log in with anything — a Web3 wallet or a familiar account

Agg lets users onboard with any Web3 wallet or a traditional login, Google, Apple, or X. Because Portal’s architecture is auth-agnostic, Agg can support any sign-in method without compromising security. New users never need to understand or save a seed phrase, and crypto-native users login with their existing wallets.

2. Multi-chain wallets, pre-created in the background

The moment a user logs in, Agg uses Portal to pre-create EVM and Solana (SVM) server wallets in the backend. By the time the user reaches their profile, their deposit wallets already exist, letting users deposit to the chain of their choice with crypto or a credit card, with no friction. Portal’s MPC architecture keeps these wallets non-custodial: keys are split across parties, so neither Agg nor Portal can unilaterally access user funds.

3. Zero-signature trading across 6+ chains and venues

When a user places a trade, Agg uses Reservoir Relay to bridge funds and swap currencies to the destination chain, then executes the order through the user’s Portal wallet. Because Portal signs securely on the backend (MPC keys inside a trusted execution environment), the entire flow completes with zero signatures for fastest execution. The user just sees the best price; the bridging, swapping, chain-switching, and signing are all abstracted away.

"By building on Portal, we made blockchain invisible, both for traders and our app partners building on Agg."

— Zach Heerwagen, CEO, Snag Solutions & Agg.Market

Why Portal was the right fit

• Non-custodial by design. MPC splits keys across parties, so users keep control of their funds while Agg keeps the experience simple.
• Multi-chain from a single integration. EVM and SVM support through one API, instead of stitching together separate wallet stacks per chain.
• Backend signing at scale. Server wallets and TEE-based signing let Agg execute trades programmatically — the foundation of the zero-signature flow.
• Auth-agnostic. Google, Apple, X, or any Web3 wallet plug in without weakening security.

The same wallet layer powers every Agg partner

This abstraction isn’t limited to agg.market. Everything above, support for any auth provider, multi-chain wallets, and zero-signature execution, is available to any partner building on Agg.

Whether a partner drops in Agg’s ready-made UI components (storybook.agg.market) or builds a fully custom front end on Agg’s APIs (docs.agg.market), they inherit Portal’s MPC wallets to manage deposits and user balances out of the box. Partners can add prediction-market trading to their app or website in days, without building managing keys, building prediction market infra, or handling cross-chain complexity themselves.

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Learn more about Agg at agg.market or build on Agg at build.agg.market. To build embedded, non-custodial wallets with Portal, try Portal for free.

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