> ## 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.

# StableFX API

> Request quotes and execute institutional FX trades between supported currencies with onchain settlement on Arc.

Use StableFX if you're a financial institution—a payment service provider,
fintech, crypto OTC desk, or prime broker—working in Request-for-Quote (RFQ)
workflows.

## 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/stablefx/postman">
    Try the StableFX API with Circle's Postman collection.
  </Card>

  <Card title="Webhooks" icon="bell" href="/api-reference/stablefx/all/get-subscriptions">
    Set up webhook subscriptions for trade events.
  </Card>
</CardGroup>

## Endpoint categories

<CardGroup cols={2}>
  <Card title="Quotes" icon="tag" href="/api-reference/stablefx/all/create-quote">
    Request a quote for an FX trade.
  </Card>

  <Card title="Trades" icon="right-left" href="/api-reference/stablefx/all/list-trades">
    Create, list, and retrieve trades.
  </Card>

  <Card title="Signatures" icon="signature" href="/api-reference/stablefx/all/register-trade-signature">
    Register and generate trade and funding signatures.
  </Card>

  <Card title="Fees" icon="receipt" href="/api-reference/stablefx/all/get-trade-fee">
    Look up fees for a trade.
  </Card>

  <Card title="Funding" icon="wallet" href="/api-reference/stablefx/all/fund-trade">
    Fund a trade for settlement.
  </Card>
</CardGroup>

## OpenAPI specifications

The StableFX API reference is generated from this OpenAPI specification:

* `https://developers.circle.com/openapi/stablefx.yaml`

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