> ## Documentation Index
> Fetch the complete documentation index at: https://sequence-0fb8d9e6-api_docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Welcome to Sequence

> The open source, modular web3 stack for onchain apps

[Sequence](https://sequence.xyz/) is a modular web3 developer platform and infrastructure stack that gives you
the building blocks to ship onchain apps fast. Leverage our **Wallets**, **Real-Time Indexer**, and **Payment solutions**,
and plug them into your existing stack. Start with creating your project on **[Sequence Builder](https://sequence.build/)**,
and develop with your preferred framework: [React](/sdk/web/overview), [React Native](/sdk/mobile), [Unity](/sdk/unity/overview)
or [Unreal](/sdk/unreal/overview).

## Start Here

<CardGroup cols={2}>
  <Card title="Create your first project" icon="folder-plus" href="/solutions/builder/getting-started">
    Set up your project on Sequence Builder, grab your API keys, and enable the core building blocks (Wallets, Indexer, Payments) for your app.
  </Card>

  <Card title="Ecosystem Wallet Demo" icon="gem" href="https://acme.ecosystem-demo.xyz">
    Try the in-browser demo of our Ecosystem Wallet with Web SDK: Customizable UI, brandable flows, and production-ready auth.
  </Card>

  <Card title="Quickstart: Wallets" icon="wallet" href="/solutions/wallets/developers/overview">
    Add a non-custodial, pop-up-free wallet experience with social/email sign-in.
  </Card>

  <Card title="Quickstart: Real-Time Indexer" icon="database" href="/solutions/indexer/overview">
    Query balances, transfers, and contract events across EVM chains with low-latency APIs.
  </Card>

  <Card title="Quickstart: Payments" icon="cart-shopping" href="/solutions/payments/overview">
    Integrate 1-click cross-chain payments with any wallet using our Trails SDK, or launch hosted primary-sale storefronts with built-in checkout.
  </Card>

  <Card title="Join our Community" icon="discord" href="https://discord.com/invite/sequence">
    Get help, share feedback, and talk shop with other builders.
  </Card>
</CardGroup>

## SDKs

<CardGroup cols={4}>
  <Card title="Web SDK" icon="code" href="/sdk/web/overview">
    Connect ecosystem or external wallets to any React or Next.js app.
  </Card>

  <Card title="React Native" icon="mobile" href="/sdk/mobile">
    Ship native mobile wallet experiences with Expo and React Native.
  </Card>

  <Card title="Unity" icon="unity" href="/sdk/unity/overview">
    Add on-chain features to interactive apps and games using Unity.
  </Card>

  <Card title="Unreal" icon={<svg width="24" height="24" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg"><path d="M16 0c-8.766 0-15.865 7.161-15.865 16s7.099 16 15.865 16c8.76 0 15.865-7.161 15.865-16s-7.104-16-15.87-16zM16 0.703c4.047 0 7.859 1.594 10.724 4.479 2.859 2.875 4.453 6.766 4.443 10.818 0 4.083-1.578 7.927-4.443 10.818-2.828 2.87-6.693 4.484-10.724 4.479-4.031 0.005-7.896-1.609-10.724-4.479-2.859-2.875-4.458-6.766-4.448-10.818 0-4.083 1.583-7.927 4.443-10.818 2.828-2.875 6.698-4.49 10.729-4.479zM15.203 6.333c-2.583 0.693-4.974 2.021-8.161 5.677s-2.583 6.677-2.583 6.677c0 0 0.88-2.078 2.995-4.266 1.005-1.036 1.75-1.385 2.266-1.385 0.458-0.026 0.844 0.344 0.844 0.802v7.422c0 0.734-0.474 0.896-0.911 0.885-0.37-0.005-0.714-0.135-0.714-0.135 2.172 3.156 7.37 3.599 7.37 3.599l2.281-2.438 0.052 0.047 2.089 1.781c3.823-2.271 5.667-6.479 5.667-6.479-1.708 1.802-2.792 2.224-3.438 2.224-0.573-0.005-0.797-0.339-0.797-0.339-0.031-0.156-0.083-2.417-0.104-4.677-0.021-2.339 0-4.682 0.115-4.688 0.661-1.24 2.766-3.74 2.766-3.74-3.932 0.776-6.073 3.354-6.073 3.354-0.635-0.5-1.927-0.417-1.927-0.417 0.604 0.333 1.208 1.302 1.208 2.104v7.896c0 0-1.318 1.161-2.333 1.161-0.604 0-0.974-0.328-1.177-0.599-0.078-0.104-0.146-0.219-0.198-0.344v-9.75c-0.141 0.104-0.313 0.161-0.484 0.167-0.219 0-0.443-0.109-0.594-0.427-0.115-0.24-0.188-0.599-0.188-1.125 0-1.797 2.031-2.99 2.031-2.99z"/></svg>} href="/sdk/unreal/overview">
    Build high-fidelity web3 game experiences with Unreal.
  </Card>
</CardGroup>

## Commerce & Payments

<CardGroup cols={2}>
  <Card title="Trails SDK" icon="cart-shopping" href="/solutions/payments/trails">
    Drop-in 1-click cross-chain payments with any wallet, for fund, swap, earn and pay flows.
  </Card>

  <Card title="Hosted Marketplace" icon="store" href="/solutions/payments/marketplace/hosted">
    Launch a branded collectibles marketplace rapidly with integrated checkout.
  </Card>

  <Card title="Marketplace APIs" icon="folder-plus" href="/solutions/payments/marketplace/custom">
    Build custom commerce flows with APIs for listings, bids, and settlements within your custom app.
  </Card>

  <Card title="Hosted Shop" icon="arrows-rotate" href="/solutions/payments/shop/overview">
    Launch a hosted primary-sale storefront with built-in checkout.
  </Card>
</CardGroup>

## Build, Ship, and Operate

<CardGroup cols={2}>
  <Card title="Sidekick" icon="coins" href="/solutions/infrastructure/sidekick/overview">
    Dockerized backend for simplified blockchain reads/writes with secure key management.
  </Card>

  <Card title="Contracts" icon="gem" href="/solutions/builder/contracts/overview">
    Rapidly deploy collectible, sale, packs contracts using audited templates.
  </Card>

  <Card title="Analytics" icon="chart-line" href="/solutions/builder/analytics">
    Observe wallet, contract, and marketplace activity to understand growth, retention, and revenue.
  </Card>

  <Card title="Cross-Chain Balances" icon="link" href="/solutions/indexer/cross-chain-balances">
    Query balances, transfers, and contract events across EVM chains with low-latency APIs.
  </Card>
</CardGroup>