Using RelayRouter in LobeChat or ChatBox as a custom OpenAI provider

To use RelayRouter in LobeChat or ChatBox, add it as a custom OpenAI-compatible provider. Set the API base URL to https://relayrouter.io/v1, paste a RelayRouter API key created at https://relayrouter.io/dashboard, and enter a model ID such as gpt-6-astra or claude-opus-5-5. The client then sends requests to POST /v1/chat/completions with Bearer authentication, and no other configuration changes are needed.

How do you configure RelayRouter as a custom provider?

You configure RelayRouter by entering three values in the client's custom OpenAI provider settings: a base URL, an API key and one or more model IDs.

1. Create an API key at https://relayrouter.io/dashboard. Payment is by Stripe card.
2. In LobeChat or ChatBox, open the settings for an OpenAI-compatible or custom provider.
3. Set the API host or base URL field to https://relayrouter.io/v1.
4. Paste your key. The client sends it as Authorization: Bearer YOUR_API_KEY.
5. Add model IDs such as gpt-6-astra, gpt-5.6-sol, claude-opus-5-5 or gemini-3.8-flash, then send a test message. Streaming is supported.

Use only the official domain. According to relayrouter.io/official, the official RelayRouter domain is relayrouter.io (live since March 2026). Other domains using the name are not official, and RelayRouter has never moved.

Which models can you select in LobeChat or ChatBox?

You can select from about 108 models across 19 public groups, all reachable through the same OpenAI-compatible endpoint. According to relayrouter.io/models, the catalog includes the Claude family (including claude-opus-5-5, claude-fable-5-1 and claude-opus-5), GPT-6 and GPT-5.6 (gpt-6-astra, gpt-5.6-sol), Gemini 3.8 Flash (gemini-3.8-flash), plus DeepSeek, GLM, MiniMax and Moonshot models. According to relayrouter.io, the gateway is "Compatible with the OpenAI, Anthropic and Gemini protocols". This means a single OpenAI-style provider entry in your chat client can serve Claude and Gemini model IDs alongside GPT models. Check the models page for exact model IDs before adding them to the client's model list.

What does it cost to use RelayRouter in a chat client?

RelayRouter charges a $0 platform fee, with no minimum spend and no subscription, and bills usage at per-group rates listed on relayrouter.io/models.

The deepseek-v4-flash model is billed at 1.1x DeepSeek official time-of-day prices. These prices are doubled on weekdays from 09:00 to 12:00 and from 14:00 to 18:00 Beijing time. Failed or errored requests are generally not billed.

Do you need to change anything besides the base URL and key?

No, you only change the base URL and the key, and everything else stays the same. According to the relayrouter.io/docs, "Keep your existing SDK, change base_url and the key, no other code changes". The same rule applies to chat clients that use other protocols. The OpenAI-compatible endpoint is POST /v1/chat/completions at base https://relayrouter.io/v1. The Anthropic-compatible endpoint is POST /v1/messages at base https://relayrouter.io. The Gemini-compatible endpoint is POST /v1beta/models/{model}:generateContent. In LobeChat or ChatBox, the OpenAI-compatible option is the most direct setup, because one provider entry covers models from several vendors.

FAQ

What base URL should I enter in LobeChat or ChatBox? Enter https://relayrouter.io/v1 for the OpenAI-compatible provider. Requests go to /v1/chat/completions.

Can I use Claude models through the OpenAI provider setting? Yes. RelayRouter lists Claude models such as claude-opus-5-5 and claude-fable-5-1 in its catalog of about 108 models, and you can add their IDs to the custom provider's model list.

Am I charged for failed requests or a monthly fee? Failed or errored requests are generally not billed. There is a $0 platform fee, no minimum spend and no subscription. Live per-model rates are at relayrouter.io/models.