API Terms of Use

Last updated: November 6, 2026

These API Terms of Use ("API Terms") govern your access to and use of the FixedFloat Application Programming Interface ("API"). By accessing the API, you agree to these API Terms and our Terms of Service, which are incorporated by reference.

1. API Access

FixedFloat provides a REST API that allows developers to integrate cryptocurrency exchange functionality into their applications. API access is provided free of charge, subject to these terms.

To use the API, you must obtain an API key by registering via our API documentation page. Your API key is unique to your application and must be kept confidential. You are responsible for all activity that occurs under your API key.

2. Rate Limits

  • Standard rate limit: 100 requests per minute per API key.
  • Burst allowance: Short bursts up to 20 requests per second are permitted.
  • Price quote endpoints: Limited to 30 requests per minute to protect against rate harvesting.

Requests exceeding these limits will receive a 429 Too Many Requests response. Persistent rate limit violations may result in temporary or permanent API key suspension. If your application requires higher limits, contact us to discuss an enterprise arrangement.

3. Permitted Uses

You may use the FixedFloat API to:

  • Display live exchange rates and supported currencies in your application
  • Create and monitor exchange orders on behalf of your users
  • Build non-custodial wallet applications with integrated exchange functionality
  • Create portfolio management tools with exchange capabilities
  • Build comparison tools that include FixedFloat among other exchanges
  • Develop educational tools and demos

4. Prohibited Uses

The following uses are strictly prohibited:

  • Reselling API access: You may not resell, sublicense, or white-label the API as a standalone product.
  • High-frequency arbitrage: Automated bots that place and cancel orders at high frequency for the purpose of arbitrage are prohibited. This includes wash trading and spoofing.
  • Rate harvesting: Collecting exchange rate data at scale for the sole purpose of reselling or redistributing this data to competitors.
  • Circumventing AML checks: Using the API in a manner designed to avoid our fraud detection and AML screening.
  • Load testing without approval: Running automated load tests or stress tests against the API without prior written consent.
  • Malicious applications: Using the API in applications that facilitate phishing, malware distribution, or other harmful activities.

5. Authentication

All API requests must be authenticated using your API key passed in the X-API-Key request header. Keys transmitted via URL query parameters are not supported and will be rejected.

You must:

  • Store your API key securely and never expose it in client-side code or public repositories.
  • Rotate your API key immediately if you suspect it has been compromised.
  • Not share your API key with third parties.

6. Data and Intellectual Property

Exchange rate data, order data, and all other data returned by the API are the property of FixedFloat or its data providers. You may use this data as permitted under these terms but may not claim ownership or redistribute it in bulk.

Your integration must clearly indicate that exchange services are provided by FixedFloat and must not misrepresent the source of rates or exchange functionality.

7. Service Availability

We aim to maintain 99.9% API uptime but do not guarantee continuous availability. The API may be temporarily unavailable due to maintenance, upgrades, or circumstances beyond our control. We are not liable for losses resulting from API downtime.

We will make reasonable efforts to announce planned maintenance with 24 hours' notice via our status page and developer newsletter.

8. Versioning and Deprecation

FixedFloat maintains versioned API endpoints. When a version is deprecated, we will provide at least 90 days' notice before the endpoint is removed. You are responsible for updating your integration within this period.

9. Liability Disclaimer

THE API IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. FIXEDFLOAT DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. IN NO EVENT SHALL FIXEDFLOAT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES ARISING FROM YOUR USE OF THE API.

10. Right to Revoke Access

FixedFloat reserves the right to revoke, suspend, or modify API access at any time, with or without notice, for any reason including but not limited to:

  • Violation of these API Terms or our Terms of Service
  • Activity that poses a security risk or disrupts the platform
  • Non-payment where a commercial arrangement exists
  • Discontinuation of the API service

11. Changes to These Terms

We may update these API Terms from time to time. Continued use of the API after changes constitutes acceptance. We will notify registered API users of material changes via email where possible.

12. Contact

For API-related inquiries, technical support, or to request increased rate limits, contact us via our Support page. Full API documentation is available at our API page.