> ## 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.

# Circle Payments Network API

> Route and settle stablecoin payments across Circle's network with support for quotes, payments, transactions, and managed payments.

Use CPN if you're a bank, fintech, or crypto platform connecting to a shared
onchain settlement rail. Pick the integration pattern that fits your stack:
direct API access where you operate your own wallets, or a fully Circle-run flow
where Circle handles the underlying sub-accounts for you.

## Get started

<CardGroup cols={2}>
  <Card title="API keys" icon="key" href="/api-reference/keys">
    Authenticate your requests with an API key.
  </Card>

  <Card title="Postman collection" icon="rocket" href="/api-reference/cpn/postman">
    Try the CPN API with Circle's Postman collection.
  </Card>

  <Card title="Webhooks" icon="bell" href="/api-reference/cpn/common/get-subscriptions">
    Set up webhook subscriptions for CPN events.
  </Card>
</CardGroup>

## Endpoint categories

<CardGroup cols={2}>
  <Card title="Circle Payments Network" icon="chart-network" href="/api-reference/cpn/cpn-platform/get-payment-configurations-overview">
    Operate your own wallets and settlement: configurations, quotes, payments,
    and transactions.
  </Card>

  <Card title="Managed Payments" icon="briefcase" href="/api-reference/cpn/managed-payments/accounts/list-accounts">
    Use Circle-managed sub-accounts for stablecoin payins and payouts.
  </Card>
</CardGroup>

## OpenAPI specifications

The Circle Payments Network API reference is generated from these OpenAPI
specifications:

* `https://developers.circle.com/openapi/configurations.yaml`
* `https://developers.circle.com/openapi/cpn-ofi.yaml`
* `https://developers.circle.com/openapi/accounts.yaml`
* `https://developers.circle.com/openapi/payments.yaml`
* `https://developers.circle.com/openapi/payouts.yaml`
* `https://developers.circle.com/openapi/managed-payments.yaml`

See [OpenAPI Specifications](/api-reference/openapi-specifications) for the full
catalog of Circle's API specs.