developer-sdk
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The Game Studio That Put a Message in Everyone's Pocket
OneSignal began with a game studio's awkward discovery: getting people to download an app was easier than giving them a reason to return. Its answer became the plumbing behind billions of daily messages - and a lesson in when to speak, when to wait, and what a notification is worth.
The Tiny Auction Inside Every Free Game
Chartboost turned the pause between two rounds of a mobile game into a marketplace. Fifteen years, two owners and billions of impressions later, the clever part is still the same: make an ad feel less like an interruption and more like an exchange.
Overwolf Burned Its Cash Building Every Gaming Tool. Then It Let Everyone Else Build Them.
The Tel Aviv company nearly died trying to be a Swiss-army knife for gamers. Its second act was simpler: give modders and app makers the tools, audience and advertising to build the missing pieces themselves.
Particle Network
Particle Network is a Singapore-based Web3 infrastructure company building chain abstraction technology so users can interact with any decentralized application on any blockchain from a single account and balance - no bridging or network switching required. Founded in 2022 as a wallet-abstraction provider, it evolved into a modular Layer-1 blockchain that coordinates transactions across chains through its flagship Universal Accounts, Universal Liquidity and Universal Gas products. Its stack has been integrated by hundreds of dApps, helped secure billions in user assets, and reached millions of users; its native PARTI token launched in March 2025.
Sphere Labs
Sphere Labs is a Boston- and Delaware-based fintech building the payments infrastructure for the stablecoin economy. Founded in 2022 by Arnold Lee and Luigi Charles, the company runs two products: SpherePay, a B2B cross-border payments API that moves money using a 'stablecoin sandwich' - converting local currency into a stablecoin, routing it across borders, then settling into the destination currency in 15-30 minutes; and SphereNet, a 'sovereign-grade' settlement ledger built on the Solana Virtual Machine for regulated financial institutions. Often described as a 'Stripe for crypto,' Sphere pairs developer-friendly APIs and SDKs with embedded compliance to help fintechs, institutions and businesses in emerging markets move value fast, transparently and legally. It raised a $5M strategic round in December 2024 led by Coinbase Ventures and Kraken Ventures.
Halliday
Halliday is a San Francisco blockchain infrastructure company building the Agentic Workflow Protocol, a system that lets developers create onchain financial applications without writing smart contracts. Its flagship product, Halliday Payments, gives developers a single interface for fiat onramps, cross-chain bridging, swaps, and offramps. Backed by a16z crypto across both its seed and Series A rounds, Halliday has raised $26 million total and works with teams including DeFi Kingdoms, Avalanche, ApeCoin, Story Protocol, and Metis.