> ## Documentation Index
> Fetch the complete documentation index at: https://developers.circle.com/llms.txt
> Use this file to discover all available pages before exploring further.

# All products

> Browse guides and examples by product

export const PermissionlessBadge = () => {
  return <div style={{
    position: "relative",
    minHeight: "20px",
    marginTop: "8px"
  }}>
      <span style={{
    display: "inline-flex",
    alignItems: "center",
    gap: "4px",
    fontSize: "0.75rem",
    color: "#6b7280",
    fontWeight: "500",
    lineHeight: "1.5"
  }}>
        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" style={{
    width: "12px",
    height: "12px",
    flexShrink: 0
  }}>
          <path fillRule="evenodd" d="M14.5 1A4.5 4.5 0 0010 5.5V9H3a2 2 0 00-2 2v6a2 2 0 002 2h10a2 2 0 002-2v-6a2 2 0 00-2-2h-1.5V5.5a3 3 0 116 0v2.75a.75.75 0 001.5 0V5.5A4.5 4.5 0 0014.5 1z" clipRule="evenodd" />
        </svg>
        Permissionless
      </span>
    </div>;
};

Circle offers two broad types of developer products, permissioned and
permissionless products. Permissioned products require a Circle developer
account and an API key, where permissionless products can be integrated with
directly with no authentication with Circle.

Permissionless products are marked on the cards on this page, all other products
are permissioned.

## Assets

<Columns cols={2}>
  <Card title="USDC" href="/stablecoins/what-is-usdc" icon="coins">
    Digital dollar stablecoin for payments and DeFi

    <PermissionlessBadge />
  </Card>

  <Card title="EURC" href="/stablecoins/what-is-eurc" icon="coins">
    Euro-backed stablecoin for European markets

    <PermissionlessBadge />
  </Card>

  <Card title="cirBTC" href="/assets/what-is-cirbtc" icon="bitcoin">
    Wrapped Bitcoin backed 1:1 by native BTC for use in DeFi

    <PermissionlessBadge />
  </Card>

  <Card title="xReserve" href="/xreserve" icon="vault">
    Stablecoins backed 1:1 by USDC reserves

    <PermissionlessBadge />
  </Card>

  <Card title="USYC" href="/tokenized/usyc/overview" icon="file-invoice-dollar">
    Tokenized yield-bearing US Treasury product
  </Card>
</Columns>

## Build onchain apps

<Tip>
  **Use [Arc App Kit](https://docs.arc.io/app-kit) to build onchain apps faster**

  App Kit is ideal when you want common payment and liquidity flows across
  blockchains without implementing each step from scratch. The Circle Wallets
  adapter uses your account credentials so App Kit can access dev-controlled
  wallets and Circle Contracts.
</Tip>

<Columns cols={2}>
  <Card title="Wallets: Dev-Controlled" href="/wallets/dev-controlled" icon="wallet">
    Create wallets and manage them on behalf of your users
  </Card>

  <Card title="Wallets: Modular" href="/wallets/modular" icon="wallet">
    Create flexible, customizable wallets with modules
  </Card>

  <Card title="Wallets: User-Controlled" href="/wallets/user-controlled" icon="wallet">
    Let your users control their own wallets
  </Card>

  <Card title="Gas Station" href="/wallets/gas-station" icon="gas-pump">
    Sponsor network fees for your users
  </Card>

  <Card title="Contracts" href="/contracts" icon="globe">
    Build and manage smart contracts
  </Card>

  <Card title="Paymaster" href="/paymaster" icon="coin-vertical">
    Pay gas fees with USDC

    <PermissionlessBadge />
  </Card>
</Columns>

## Crosschain transfers

<Tip>
  **Use dedicated SDKs for crosschain transfers**

  [Bridge Kit](https://www.npmjs.com/package/@circle-fin/bridge-kit) and
  [Unified Balance Kit](https://www.npmjs.com/package/@circle-fin/unified-balance-kit)
  let you move USDC across blockchains without low-level protocol work. Both
  support multiple blockchains and wallet providers.
</Tip>

<Columns cols={2}>
  <Card title="CCTP" href="/cctp" icon="arrow-up-arrow-down">
    Move USDC natively between chains

    <PermissionlessBadge />
  </Card>

  <Card title="Gateway" href="/gateway" icon="dungeon">
    Enable a unified USDC balance

    <PermissionlessBadge />
  </Card>
</Columns>

## Payments

<Card title="Circle Payments Network" href="/cpn" icon="chart-network">
  Global, real-time settlement
</Card>

## Mint & FX

<Columns cols={2}>
  <Card title="Mint" href="/circle-mint" icon="building-columns">
    Mint and redeem USDC and EURC
  </Card>

  <Card title="StableFX" href="/stablefx" icon="swap">
    Integrate FX for stablecoins
  </Card>
</Columns>