FAQ

Direct answers to the questions we are actually asked.

Is this the official Anthropic API?

No. ClaudeAPIKey.dev is an independently operated gateway that resells API capacity and exposes an Anthropic-compatible interface. We are not affiliated with, endorsed by or sponsored by Anthropic. If you need a contract with Anthropic itself, use the official API.

Will my existing code work?

If it uses the Anthropic or OpenAI SDK, yes — change the base URL and the key. See Migrating from Anthropic or from OpenAI.

Do credits expire?

No. Prepaid credits stay on the account until spent. Unlimited plans are different — they run for a fixed window and end when it expires.

Which is cheaper for me, credits or a plan?

Credits suit bursty or low-volume use because you pay only for tokens. A flat-rate plan wins when you are running an agent for hours a day, where per-token billing on a long session outruns the plan price. See Plans.

Can I use this with Claude Code?

Yes — two environment variables. It is the most common setup. See Claude Code.

Why is my bill higher than I estimated?

Almost always context growth. Every turn resends the whole conversation, so a long agent session pays for its history repeatedly. See Context management.

Do you support tool use / function calling?

Yes, in both formats. See Tool use.

Do you store my prompts?

Request metadata needed for billing and abuse prevention is retained. Do not send data you are contractually barred from sharing with a third-party processor — see Security and privacy.

What happens if a model is deprecated?

Model ids are pinned and do not silently change under you. Retirements are announced in the changelog.

How do I get support?

support@claudeapikey.dev. Include the endpoint, model id, status code and error body — never your API key.