How to Buy LLMsRelay API Usage and Create a Key
Create a LLMsRelay account, add platform usage, generate a key, and configure a compatible API route.
LLMsRelay is an independently operated API gateway. It is not affiliated with or endorsed by Anthropic, PBC. Product and model names are used only to describe compatibility.
What You Create
A LLMsRelay API key authenticates your requests to the LLMsRelay developer gateway. It can be used with supported Anthropic-compatible and OpenAI-compatible request formats in custom applications, IDEs, and automation tools.
The exact model IDs available to a key depend on its group and current gateway availability. Confirm them with GET /v1/models before configuring a production client.
Step-by-Step: Getting Your API Key
1. Create a LLMsRelay Account
Visit llmsrelay.com and sign up. Registration is quick — you only need an email address.
2. Choose a Plan
Select a one-time platform usage pack on the Plans page. The current price, usage amount, payment methods, and any fixed bonus are displayed before checkout.
3. Add Credits
Purchase platform usage through the dashboard. Available card and cryptocurrency options are shown at checkout.
4. Generate Your API Key
Navigate to API Keys in your dashboard and click Create Key. You can optionally set a name and credit limit per key.
5. Start Making Requests
Use your key with the Anthropic-compatible Messages API endpoint:
curl https://api.llmsrelay.com/v1/messages \
-H "x-api-key: YOUR_API_KEY" \
-H "content-type: application/json" \
-H "anthropic-version: 2023-06-01" \
-d '{
"model": "claude-sonnet-4.6",
"max_tokens": 256,
"messages": [{"role": "user", "content": "Hello"}]
}'Frequently Asked Questions
Can I use this key with Cursor, VS Code, or Claude Code?
Yes. LLMsRelay API keys are compatible with all major IDE integrations. See our IDE Integration guide for setup instructions.
Is there a pay-as-you-go starter ($5)?
LLMsRelay uses pay-as-you-go pricing. You only pay for what you use — start with the smallest credit package to test the service.
Which model IDs should I configure?
Use GET /v1/models after creating your key. It returns the IDs currently available to that key and is the source of truth for configuration.