Kraken, Rainbow, Backpack & Infinex: wallet data, unlocked by Zerion
Enriched balances, positions, transactions, and NFTs across 42 chains and 4,500+ protocols — the data layer behind the wallets and DeFi apps people trust.
Real teams, real results
How wallets & defi teams ship faster on the Zerion API — the challenge each faced, and what they built with it.
Global crypto exchange for spot and derivatives, expanding institutional services.
Challenge
Kraken built a self-custody wallet to help its users connect to the decentralized web. They needed a simple way to show users' tokens with price charts and transaction history across Ethereum, Polygon, Arbitrum, Optimism, Base, and Blast — reliably, at the scale of their user base, without running their own infrastructure.
Solution
Kraken chose the Zerion API, using a single call to fetch all token positions and transactions across Ethereum and their required Layer-2 networks, and another endpoint to add charts for any token. While Zerion handles the data infrastructure, Kraken focuses on a simple, safe, private self-custodial experience.
Self-custodial wallet and exchange across Solana, EVM, and BTC.
Challenge
Backpack needed accurate transaction histories and token balances to deliver clear, engaging wallet insights across multiple chains — without running their own extensive indexing infrastructure.
Solution
Backpack integrated the Zerion API to fetch detailed transaction histories and token balances across chains — accurate data, fast — and added new chains like the Monad testnet in days.
InfinexUser-friendly DeFi app from the Synthetix founder — one interface for many protocols.
Challenge
Infinex needed real-time, reliable cross-chain data for trading and portfolio views, but managing multiple chain integrations was slow, costly, and complex.
Solution
Zerion's Portfolio and Webhook APIs deliver unified multi-chain data, instant updates, and enterprise-grade reliability — cutting engineering overhead and letting Infinex focus on building a best-in-class crypto UX.
Real results from teams shipping with Zerion API
Wallets, agents, consumer apps, and institutions — all built on the same API.
Endpoints
Portfolio Data
Track tokens, NFTs, and balances across EVM & Solana with a single call.
Explore the Portfolio Data API
One API, every major chain
Ethereum, Base, Solana, Arbitrum, Optimism and 37 more networks — queried in a single call.
Ethereum
Base
Solana
Arbitrum
OptimismEthereumBaseSolanaArbitrumOptimismEthereumBaseSolanaArbitrumOptimismEthereumBaseSolanaArbitrumOptimismEthereumBaseSolanaArbitrumOptimismEthereumBaseSolanaArbitrumOptimism
Polygon
Avalanche
BNB Chain
Robinhood
Linea
ScrollPolygonAvalancheBNB ChainRobinhoodLineaScrollPolygonAvalancheBNB ChainRobinhoodLineaScrollPolygonAvalancheBNB ChainRobinhoodLineaScrollPolygonAvalancheBNB ChainRobinhoodLineaScrollPolygonAvalancheBNB ChainRobinhoodLineaScroll
Zora
Celo
Gnosis
Fantom
Aurora
HyperEVMZoraCeloGnosisFantomAuroraHyperEVMZoraCeloGnosisFantomAuroraHyperEVMZoraCeloGnosisFantomAuroraHyperEVMZoraCeloGnosisFantomAuroraHyperEVMZoraCeloGnosisFantomAuroraHyperEVMWhy wallets & defi teams
build on Zerion
Ship faster
Live in minutes
One key, one request, and you're serving portfolio data. No nodes, no indexers, nothing to maintain.
Reliability
Battle-tested at scale
The same infrastructure behind Zerion Wallet and the industry's biggest wallets.
Real-time
Fresh with every block
Balances, positions, and transactions that move with the chain. Never stale, never guessing.
Coverage
Every chain, one schema
EVM and Solana, normalized into a single response. One integration covers everything your users touch.
Stay ahead with the Zerion API
New endpoints, chains, and webhooks — straight to your inbox.
Simple, transparent tiers
Start building for free. Upgrade as you scale.
DeFi Positions, Wallet Portfolio Chart, and Wallet P&L endpoints are limited to 25% of every plan quota and aren’t covered by overages.
For early prototypes and proofs of concept
Get started free- 2K requests / day
- 3 RPS limit
- Chat widget
- Best effort support
For shipping MVP without running any Infrastructure
Start building- Up to 250K requests / month
- 10 RPS
- Telegram group
- Priority support
For apps preparing for launches or already in production
Start building- Up to 1M requests / month
- 25 RPS
- Slack or Telegram channel
- Priority support
Custom pricing & features
For scale-ups & enterprises with high volume or custom needs
Contact salesWhat can you build?
Wallets & Stablecoins
Power portfolio views, transaction history, and in-app swaps with one API — across every chain and stablecoin your users hold.
Fintech & Neobanks
Add portfolio charts, PnL, and transaction history to your app — no blockchain node to stand up, no infra to maintain.
AI Agents
Wallet holdings, DeFi positions, and PnL in a single call. Pay per request with x402 on Base — no subscriptions, no keys.
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Trusted by the companies you know
From multichain wallets to onchain apps — teams build on Zerion API.
“Zerion API powers Kraken 2.0 with reliable token balances, P&L, and transaction history through one consolidated integration, making it easier to scale to more users.”
“We've worked with Zerion API since day zero, even before launching Uniswap Wallet. From multichain positions to EIP-7702 batching, they've been key partners.”
“We use Zerion in production across the Base App, from transaction history to real-time PnL. It's scaled with us from the first rollout to millions of users, including our expansion to Solana. The data just works, and their team moves as fast as we do.”
“Zerion's transaction and portfolio APIs power Privy's wallet experience. Everywhere we show wallet balances in the dashboard is powered by Zerion. Their reliable data has given our engineers the speed and reliability to deliver a core part of Privy's value to developers.”
Built for developers.
Trusted by enterprises.
Give wallets, AI agents, and consumer apps reliable access to wallets, positions, transactions, and DeFi data across chains.
FAQ
If you have any questions