> ## Documentation Index
> Fetch the complete documentation index at: https://docs.4mica.io/llms.txt
> Use this file to discover all available pages before exploring further.

# All products

> Understand the product surface across protocol, facilitator, SDKs, and app.

4Mica is more than a protocol. It gives you the tools to add x402 microtransactions across apps, agents, APIs, and services.

Use this page as a map to the protocol, facilitator, SDKs, middleware, and hosted tools that make up 4Mica.

### Protocol

The foundation for collateral, credit, and settlement.

<Columns cols={2}>
  <Card title="Core4Mica contracts" icon="landmark" href="/core-concepts/deposits-and-withdrawals" arrow="true" cta="View deposits">
    Learn how collateral is deposited, withdrawn, and used to secure future payment guarantees.
  </Card>

  <Card title="Settlement" icon="receipt" href="/core-concepts/settlements" arrow="true" cta="View settlements">
    Understand how guarantees are cleared, how defaults are covered, and how 4Mica reduces on-chain transactions.
  </Card>
</Columns>

### Payments

The services that make 4Mica usable inside x402 payment flows.

<Columns cols={2}>
  <Card title="Facilitator" icon="route" href="/core-concepts/facilitator" arrow="true" cta="View concept">
    See the role the facilitator plays between buyer clients, seller routes, and protocol settlement.
  </Card>

  <Card title="Payment flow" icon="diagram-project" href="/api-reference/payment-flow" arrow="true" cta="View flow">
    Follow the request lifecycle from HTTP 402 response to signed guarantee and protected content.
  </Card>
</Columns>

### SDKs and middleware

Developer tools for adding 4Mica to your own app, API, agent, or backend service.

<Columns cols={3}>
  <Tile href="/quick-start/nodejs" title="NodeJS">
    <Icon icon="node-js" iconType="brands" size={40} />
  </Tile>

  <Tile href="/quick-start/python" title="Python">
    <Icon icon="python" iconType="brands" size={40} />
  </Tile>

  <Tile href="/quick-start/rust" title="Rust">
    <Icon icon="rust" iconType="brands" size={40} />
  </Tile>
</Columns>

### Hosted tools

Hosted tools for getting configured, testing flows, and moving toward production.

<Columns cols={2}>
  <Card title="4Mica app" icon="window-maximize" href="https://app.4mica.io" arrow="true" cta="Launch app">
    Set up a wallet and collateral visually before moving the flow into an SDK.
  </Card>

  <Card title="Supported networks" icon="globe" href="/getting-started/supported-networks" arrow="true" cta="View networks">
    Choose the right testnet or production network for your buyer, seller, or route.
  </Card>
</Columns>