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

# Build with v3

> Developer documentation for the enrolled v3 Agent Surface preview.

The v3 Agent Surface is an enrolled preview of Interchange's account-resolved
MCP API. v2 remains the stable default; this section explains how to evaluate
v3 through a separate connector without migrating or changing an existing
integration.

<CardGroup cols={2}>
  <Card title="Read the overview" icon="flask" href="/v2/setup/v3-preview">
    Understand what changes from v2 and which account kinds are supported.
  </Card>

  <Card title="Connect to v3" icon="plug" href="/v2/setup/v3/quickstart">
    Configure an MCP client, authenticate, verify enrollment, and make a first
    read safely.
  </Card>

  <Card title="Build a buyer workflow" icon="bullhorn" href="/v2/setup/v3/buyer-workflows">
    Author campaigns, request proposals, stage media buys, and launch.
  </Card>

  <Card title="Build a seller workflow" icon="store" href="/v2/setup/v3/seller-workflows">
    Configure inventory, operate work, and inspect seller delivery.
  </Card>
</CardGroup>

<Note>
  Choosing v3 in the documentation picker does not enroll an account or change
  an existing integration. Use v2 unless Interchange has enrolled your account
  in the preview.
</Note>