CLIENT
User device
- Key generated and stored on device
- User signs every transaction
- Altude never sees the private key
Altude - Keep more of every payment.
await altude.createAccount(accountOptions)
await altude.send(sendOptions)
You sent Bob 500 USDC!
Built on Solana. Gasless, non-custodial wallet infrastructure with simple APIs for developers and a seamless experience for users.
Go live in minutes. No blockchain expertise required.
Built with Altude
WHAT IS ALTUDE
Keep more of every payment. Reach more customers.
Altude abstracts wallets, gas fees, and transaction infrastructure into simple REST APIs and multi-language SDKs — so any web or mobile team can ship production-grade blockchain features without deep on-chain expertise.
Ship production-ready Solana apps without blockchain complexity
Altude abstracts wallets, gas, and transaction infrastructure so you can focus on building your product. No deep blockchain expertise required.
Users transact without buying
SOL or installing wallets
await altude.createAccount (accountOptions)await altude.makeTransfer (transferOptions)You sent 500 USDC to Bob
Users can sign in and transact without buying SOL or managing seed phrases. Keys stay with the user. Altude never takes custody.
Simple APIs that let
you ship faster
Integrate with simple REST APIs and SDKs instead of building wallet and transaction infrastructure yourself. Available across web, mobile, and game engines.
Monitor and control your
app in one place
View transactions, users, and usage in real time, and manage your app’s settings from a single dashboard.
FAST DEVELOPER INTEGRATION
Works with your stack
Get an API key, make one call, and your users can transact without SOL. No deep blockchain expertise required. Explore the docs →
Same API. Same behavior. Across every platform.
SDKs
SDKs for Every Platform
First-party SDKs for Android, iOS, Web, Flutter, Python, and Unity — all with native gasless support.
See all SDKsAPI OVERVIEW
API at a Glance
Everything you need to get started — auth, base URL, and core capabilities. Full endpoint docs live at docs.altude.so.
Authentication
Authenticate every request with an API key passed as an HTTP header:
X-API-Key: <your-api-key> Base URL
All API requests are made over HTTPS to:
https://api.altude.so/api/ Create Wallets
Provision non-custodial Solana wallets for your users in a single API call.
Send Transactions
Submit gasless token transfers — users never need SOL to pay fees.
Check Balances
Query wallet balances and transaction history in real time.
ARCHITECTURE
Non-custodial by design
Keys are generated and held on the user's device. Altude sponsors fees and relays transactions, but never takes custody of funds or keys.
ALTUDE
Gas & transaction infrastructure
- Acts as fee payer for sponsored transactions
- Validates, relays, and submits transactions
- Never holds user keys or funds
NETWORK
Solana
- Receives the sponsored transaction
- Validates the user's signature
- Settles on-chain in seconds
CUSTODY MODELKeys on device•Altude sponsors fees•Zero custody of funds
+
+
GASLESS
Users don’t need SOL to use your app
Altude sponsors and relays transactions so users can interact with your app without holding tokens. You don’t need to manage fee logic or maintain relayers.
No SOL required
Ship in minutes
Users own keys
Simple APIs
Solana native
gasless transactions
No SOL required
Ship in minutes
Users own keys
Simple APIs
Solana native
gasless transactions
GAS SPONSORSHIP
How a sponsored transaction works
Altude pays the network fee so your users don't have to, then bills you once a month. We handle fee payment, relaying, and submission end to end.
1
The user signs, non-custodially
A user taps send or mints in your app — with no SOL and no wallet prompt. The Altude SDK builds the transaction on device and the user's keypair signs it client-side. Keys never leave the device.
2
Altude sponsors the fee
The signed transaction is sent to Altude, which adds the fee-payer signature and covers the SOL network fee on the user's behalf.
3
Confirmed on Solana
Altude submits the fully-signed transaction to Solana, monitors for commitment, and returns the confirmed signature to your app.
1User signs on device
2Altude sponsors the fee
3Confirmed on Solana
Build Solana apps without the complexity
with Altude's Innovative Platform
Gasless transactions, non-custodial ownership, and simple APIs.
Gasless transactions
Users don’t need SOL to use your app. Altude sponsors and relays transactions for you.
Non-custodial by default
Users always control their keys. Altude never takes custody.
Simple developer APIs
Integrate with REST APIs and SDKs instead of building blockchain infrastructure.
Get Started
Be among the first to experience the future of Web3 development
Building the next generation of user experiences
It is easy, frictionless, it works like Venmo, it works like Cash App. This is Solana — the user doesn't need to know about it. And they could see it in action and be like, made possible by you guys.
Will McDonnell, Yatori
Frequently Asked Questions
Altude is a gasless, non-custodial wallet infrastructure platform for Solana apps. It provides developer-friendly SDKs and APIs that let you embed wallets and enable transactions in your app without requiring users to hold SOL for gas fees or manage private keys.
Altude routes every transaction through its Gas Station API — a dedicated service that acts as the fee-payer on the Solana network. When a user initiates a transaction, they sign it through the Altude SDK, which forwards it to the Gas Station API. Altude co-signs as the fee-payer and submits the transaction to the Solana network on the user's behalf. Users never need to hold SOL for fees; usage is metered and billed to your developer account.
The Altude Gas Station API is a REST endpoint that acts as the fee-payer on the Solana network. When your SDK or backend submits a signed transaction to the Gas Station API, Altude co-signs it as the fee-payer and submits it to the Solana network — covering all lamport fees so users never need SOL in their wallets. The API accepts standard Solana transaction payloads and returns a confirmed transaction signature.
Install the Altude SDK for your platform (JavaScript/TypeScript, iOS, Android, Unity, or Flutter), initialise it with your API key, and call createWallet() to provision a non-custodial wallet for each user. From there, use the SDK's transaction helpers — gasless fee sponsorship via the Gas Station API is built in, so no additional configuration is needed. Full guides are available at docs.altude.so.
Yes. Altude is fully non-custodial — users always control their own private keys and funds. Altude never takes custody of user assets. The wallet infrastructure handles key generation and secure storage on the user's device or in their chosen secure enclave, not on Altude's servers. And because our SDKs are open source, there's no mystery about how any of this works — you can inspect the code yourself.
Altude is built natively on Solana, leveraging its high throughput and low transaction costs to deliver fast, near-free gasless transactions for your users.
Altude provides SDKs for JavaScript/TypeScript (web), iOS (Swift), Android (Kotlin), Unity, and Flutter. All SDKs share a consistent API surface, so skills transfer across platforms. A REST API is also available for any environment not covered by a native SDK.
No. Altude's wallet infrastructure includes built-in fee sponsorship, so your app covers transaction costs on behalf of users. Users never need to acquire or hold SOL to interact with your app, removing one of the biggest barriers to Web3 adoption.
Altude uses usage-based pricing: you pay the Solana network fees and rent-exempt deposits Altude sponsors for your app at pass-through, plus a 10% Altude fee, billed monthly. There is no subscription or per-user fee, and Devnet is free. See the pricing page for details.