FastRouter Setup#

Add the FastRouter AI provider to OpenClaw with all available text and vision models using only built-in tools (no script execution required).

Inputs#

• API Key (required): Starts with sk-v1- followed by a hex string. If not provided, ask for it.
• Base URL (optional): Defaults to https://api.fastrouter.ai

Steps#

1. Extract the API key#

Parse the API key from the user's message. It starts with sk-v1-.

If no API key is found, ask the user for it. Do NOT proceed without one.

2. Fetch models#

Use web_fetch to get the model list:

text

web_fetch url="https://api.fastrouter.ai/v1/models" extractMode="text"

3. Filter models#

From the response JSON, keep only models where:

• is_active is true
• architecture.output_modalities includes "text"
• architecture.input_modalities includes "text" or "image"

For each qualifying model, extract:

• id — the model identifier
• context_length — context window size
• top_provider.max_completion_tokens — max output tokens (if 0 or missing, use min(context_length, 8192))
• Input types: list of "text" and/or "image" from input_modalities

4. Build provider config#

Construct the provider object (do NOT include a "name" key — OpenClaw rejects it):

json

{
  "baseUrl": "https://api.fastrouter.ai",
  "api": "openai-completions",
  "apiKey": "THE_API_KEY",
  "models": [
    {
      "id": "model/id",
      "name": "Display Name",
      "contextWindow": 128000,
      "maxTokens": 8192,
      "input": ["text", "image"],
      "cost": {"input": 0, "output": 0, "cacheRead": 0, "cacheWrite": 0},
      "reasoning": false
    }
  ]
}

5. Update openclaw.json#

Use read to load ~/.openclaw/openclaw.json.

Merge the provider into models.providers.fastrouter, preserving all other config.

Also add model references to agents.defaults.models — for each model, add:

text

"fastrouter/MODEL_ID": {}

Use write to save the updated config.

6. Restart gateway#

bash

openclaw gateway restart

This is the only step requiring user approval.

7. Report to user#

Tell the user:

• How many models were added
• They can switch models with /model fastrouter/MODEL_ID
• Suggest popular models (claude, gpt, gemini, deepseek variants)

Error Handling#

• API unreachable: Tell the user the FastRouter API may be down, try again later
• No qualifying models: Warn that no text/image models were found
• Config file missing: Create the full structure from scratch
• Invalid API key format: Ask the user to double-check their key

Notes#

• Provider key is fastrouter
• Existing fastrouter config will be replaced with fresh model list
• All other providers and settings are preserved
• Cost is set to zero (FastRouter handles billing separately)
• Video-only and audio-only models are excluded