How Symphony built a rewards-driven savings app on Alchemy

Most consumer finance is built to reward spending. Credit card points, cashback, travel perks: all of it pays you for buying more. Symphony flips that model. It is a mobile savings app that rewards people for saving, with a fixed 5% APY that can be earned in cash, credit-card-style points, or a mix of both. Users can redeem their points for flights, hotels, upgrades, and experiences across several major global airline and hotel partners.

The simple savings app users see sits on top of a complex multi-chain stack that Symphony runs on Alchemy across six major networks.

Products used: Node RPC, Gasless Transactions, Webhooks

The challenge

Symphony's hardest problem is making a regulated, multi-rail financial product feel as simple as opening a banking app.

The consumer experience is made easy: link a bank account, deposit cash, pick how you want rewards, earn a fixed 5% APY, and withdraw whenever you want. Underneath that, a single deposit crosses several different financial systems. Cash comes in through traditional banking rails. It gets represented as USDC so it can settle and move in seconds. Yield is generated from real-world assets like short-term US Treasuries and institutional credit. Points accrue against the balance in real time. And when a user withdraws, the whole path runs in reverse, cleanly and predictably.

The blockchain layer is what ties that money movement together. Symphony gives every user a programmable wallet the moment they sign up, with no wallet to set up, no seed phrase, and no gas fees, then moves their balances across networks behind the scenes. The person using the app sees a savings balance. Underneath, each movement of their money runs onchain and has to settle correctly every time.

The technical job, then, is to make that onchain layer reliable and completely invisible. A deposit should feel like a deposit, not like signing a blockchain transaction.

The solution

Alchemy powers the onchain execution layer underneath the app. It helps to think of it as a few layers stacked under a single savings balance.

The wallet layer

When a user signs up, Symphony provides a programmable wallet for them in the background, built on Alchemy's wallet infrastructure. There is no seed phrase to write down and no separate app to install. The wallet is programmable, and that design is what lets Symphony resolve the usual tradeoff in consumer finance between ease of use and control of funds. Because the wallet can hold its own logic, Symphony can take the complexity off the user—moving funds, covering gas, applying rules—while the security guarantees stay enforced at the account level rather than resting on a user remembering a set of private keys.

The transaction layer

Every time a user moves their money, that action has to get onchain and confirm. Alchemy's gasless transaction infrastructure does that work, packaging the transaction, submitting it, and covering the gas, so the user never sees a network fee or has to hold a token to pay one. When someone deposits to start earning or withdraws back to their bank, they tap once and the transaction runs underneath in response—no gas, no signing prompts, no blockchain steps to manage. The user stays in control of every action; Alchemy just removes the mechanics behind it.

The data and access layer

Symphony reads and writes across six networks through Alchemy's RPC APIs, the connection to each blockchain itself. On top of that, webhooks push real-time updates back to the app, so balances, transactions, and rewards stay current the moment anything settles onchain.

Together those layers let Symphony's engineers stay focused on their actual product—the savings experience, the rewards engine, and the money movement between banking and stablecoin rails—instead of building or running low-level blockchain infrastructure themselves.

The results

Symphony's platform has processed more than $500 million in transaction volume, a sign of the reliability and scale a consumer financial product demands. That volume runs on infrastructure that has stayed clean under load. Over the last 30 days, Alchemy served 800k+ requests across 6 chains for Symphony at a 100% success rate across every correctly configured mainnet.

For a consumer finance app, that reliability is the product. Users need to know their money, balances, transactions, and rewards are handled correctly, so proven reliability is what lets Symphony make that promise. It is also what lets the company keep all the underlying complexity out of sight and ship a savings app that just works.

Symphony treats Alchemy as a partner, not just a vendor. Symphony chose Alchemy for three reasons:

• Chain coverage and proven reliability at scale. One set of APIs covering all six networks Symphony runs on, with the uptime a financial product depends on as volume grows.
• Performance at the cutting edge. Gas abstraction and programmable wallets were relatively new and complex technology to implement well. Alchemy got the hard parts right and the tooling performed reliably under real usage, so Symphony could build on it with confidence.
• Documentation and support. Clear docs and a responsive team that cut implementation time and helped Symphony move from concept to production faster.

"For decades, financial products have rewarded consumers for spending more instead of saving more," said Vik Chawla, Co-Founder and CEO of Symphony. "We're building a future where consumers are rewarded for making smarter financial decisions, earning points and growing their wealth simply by saving. To deliver that experience at scale, we needed infrastructure that could seamlessly bridge traditional finance and digital assets while remaining invisible to the end user. Alchemy provides the foundation that allows us to bring modern, AI-powered savings experiences to mainstream consumers."

What's next

Symphony's immediate focus is scaling the consumer app and bringing a better savings experience to a much broader audience. That means growing adoption, expanding the rewards ecosystem, and continuing to make saving more rewarding than spending.

As the company scales, it plans to keep investing in the infrastructure behind seamless onboarding, secure asset management, and intelligent financial experiences. Longer term, Symphony sees room for AI to help consumers optimize savings, rewards, and everyday financial decisions, with the goal of becoming an intelligent financial companion that helps people save more and make better choices automatically. The near-term priority stays clear: build the best consumer savings product possible and get it into more hands.

Build the same kind of experience on Alchemy

Symphony shows what is possible when programmable wallets, gasless transactions, and reliable multi-chain infrastructure work invisibly behind a mainstream savings product.

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For more details about Symphony, visit symphony.io.