Unfortunately, the HTTP API is not available on the Starter plan. It's a feature that's only enabled with the Explorer plan and higher. The Starter plan allows you to use your own API keys for data enrichment tools within Clay, but it doesn't include access to the HTTP API feature. If you need to use the HTTP API for your exercise, you would need to upgrade to the Explorer plan. If you're experiencing any JSON-related issues or errors with the HTTP API, please share the JSON in the chat so we can help troubleshoot further.