> ## 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.

# CCTP API

> Fetch attestations and support native USDC transfers across blockchains using Cross-Chain Transfer Protocol.

CCTP is permissionless and open to any wallet. Burn USDC on a source blockchain,
then mint it on the destination once Circle issues the corresponding
attestation. No API key required.

## Get started

<CardGroup cols={2}>
  <Card title="CCTP documentation" icon="book" href="/cctp">
    Learn how Cross-Chain Transfer Protocol works.
  </Card>

  <Card title="Supported chains and domains" icon="link" href="/cctp/concepts/supported-chains-and-domains">
    See which blockchains CCTP supports and the domain IDs you'll need.
  </Card>
</CardGroup>

## Endpoint categories

<CardGroup cols={2}>
  <Card title="CCTP V2" icon="bridge" href="/api-reference/cctp/all/get-public-keys-v2">
    Current endpoints for messages, attestations, and burn fees.
  </Card>

  <Card title="CCTP V1 (Legacy)" icon="clock-rotate-left" href="/api-reference/cctp/all/get-attestation">
    Legacy endpoints for existing V1 integrations.
  </Card>
</CardGroup>