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Terms of Service

Thompson Data Products, LLC · Last updated May 2026

1. Agreement

By accessing or using The Card API ("the Service"), operated by Thompson Data Products, LLC ("we," "us," or "our"), you agree to be bound by these Terms of Service. If you do not agree, do not use the Service.

2. The Service

The Card API provides programmatic access to trading card transaction data, including sale records from eBay, Goldin, Heritage Auctions, and other platforms. The Service is provided for informational and development purposes only and is not intended as financial or investment advice.

3. API keys and accounts

  • Your API key is personal and non-transferable. Do not share it publicly.
  • You are responsible for all usage under your key.
  • If you believe your key has been compromised, contact us immediately to have it revoked and reissued.
  • One account per person or organization. Creating multiple free accounts to circumvent rate limits is prohibited.

4. Acceptable use

You agree not to:

  • Resell, sublicense, or redistribute raw API access or responses to third parties without a written agreement with us.
  • Reverse engineer or attempt to extract our underlying data sources or infrastructure.
  • Use the Service to violate any applicable law, including intellectual property rights.
  • Attempt to circumvent rate limits or access controls.
  • Use the Service in a way that degrades performance for other users.

5. Rate limits and tier restrictions

Each pricing tier includes specific limits on daily requests, rows per request, and data lookback windows. These limits are enforced automatically. Exceeding them will result in rate-limit errors (HTTP 429) until the limit resets. Upgrading your plan increases these limits immediately.

6. Payment and billing

  • Paid plans are billed monthly or annually via Stripe. Prices are listed at thecardapi.com/pricing.
  • Paid plans include a 7-day free trial. You will not be charged until the trial ends.
  • You may cancel at any time via the billing portal. Cancellation takes effect at the end of the current billing period.
  • We do not offer refunds for partial billing periods.
  • We reserve the right to change pricing with 30 days' notice to active subscribers.

6a. Free trial terms

  • The 7-day free trial is available to new Starter and Pro subscribers only. One trial per person or organization.
  • No charge is applied during the trial period. Your card is authorized at signup but not billed until day 8.
  • You may cancel at any time before the trial ends with no charge. If you do not cancel, your paid subscription begins automatically at the end of the trial.
  • We reserve the right to revoke trial access if misuse or multiple trial accounts are detected.

7. Data accuracy

Transaction data is provided "as is" from public marketplace sources. While we strive for accuracy and completeness, we make no warranty that the data is error-free, complete, or current. Do not rely solely on this data for financial decisions. We are not responsible for decisions made based on data accessed through the Service.

8. Intellectual property

The compiled database, API design, and associated software are proprietary to Thompson Data Products, LLC. Your API key grants you a limited, non-exclusive, non-transferable license to access the data for your own applications. No ownership rights are transferred.

9. Termination

We may suspend or revoke your API key immediately and without notice if you violate these Terms. We may also terminate the Service at any time with reasonable notice. Upon termination, your access to the API will cease.

10. Limitation of liability

To the maximum extent permitted by law, Thompson Data Products, LLC is not liable for any indirect, incidental, special, consequential, or punitive damages arising from your use of the Service, including but not limited to loss of revenue, data, or business opportunity. Our total liability shall not exceed the amount you paid us in the three months prior to the event giving rise to the claim.

11. Governing law

These Terms are governed by the laws of the United States. Any disputes shall be resolved through binding arbitration or in the courts of competent jurisdiction.

12. Changes to these Terms

We may update these Terms at any time. We will notify active subscribers by email of material changes. Continued use of the Service after the effective date constitutes acceptance of the updated Terms.

13. Export restrictions

The Service is operated from the United States and is subject to U.S. export control laws and regulations. You may not access or use the Service if you are located in, under the control of, or a national or resident of any country subject to U.S. economic sanctions or trade embargoes, including those administered by the U.S. Office of Foreign Assets Control (OFAC). You also may not use the Service if you appear on any U.S. government list of prohibited or restricted parties. By using the Service, you represent and warrant that you are not located in any such country and are not on any such list.

14. Contact

Questions about these Terms: hello@thecardapi.com