Quickstart - RouterLink

This guide gets you from zero to a working API call. By the end you’ll have:

A RouterLink account and API key
A successful chat completion against any supported model
A budget set on your key so you can’t overspend

1. Create an API key

Visit routerlink.ai and sign in with email or Google.

Top up credits

Open Settings → Billing and add credits.

Generate a key

Go to API Keys → Create key. Copy the key (it starts with sk- and is shown only once).

2. Make your first request (OpenAI-compatible)

Replace <ROUTERLINK_API_KEY> with your RouterLink Key.

For available model options, please check the Model Gallery. Simply copy and paste the model name to use it.

Curl
Python
Node.js

curl https://router-link.world3.ai/api/v1/chat/completions \
  -H "Authorization: Bearer <ROUTERLINK_API_KEY>" \                                                                                                                    
  -H "Content-Type: application/json" \
  -d '{                                                                                                                                                                
    "model": "world3-router-north-america/openai/gpt-5.3-codex",                                 
    "messages": [                                                                                                                                                      
      {"role": "user", "content": "Say hello in one short sentence."}
    ]                                                                                                                                                                  
  }'                                                        

from openai import OpenAI                                                                                                                                              
                                                            
client = OpenAI(
    base_url="https://router-link.world3.ai/api/v1",
    api_key="<ROUTERLINK_API_KEY>",                                                                                                                                    
)
                                                                                                                                                                       
resp = client.chat.completions.create(                      
    model="world3-router-north-america/openai/gpt-5.3-codex",
    messages=[{"role": "user", "content": "Say hello in one short sentence."}],                                                                                        
)
print(resp.choices[0].message.content)                                                                                                                                 

import OpenAI from "openai";
                                                                                                                                                                       
const client = new OpenAI({                                 
  baseURL: "https://router-link.world3.ai/api/v1",
  apiKey: process.env.ROUTERLINK_API_KEY,                                                                                                                              
});
                                                                                                                                                                       
const resp = await client.chat.completions.create({         
  model: "world3-router-north-america/openai/gpt-5.3-codex",
  messages: [{ role: "user", content: "Say hello in one short sentence." }],                                                                                           
});
console.log(resp.choices[0].message.content);                                                                                                                          

3. Use the native Anthropic SDK

RouterLink exposes an Anthropic-compatible Messages endpoint, so any official Anthropic client SDK works by overriding base_url (and pointing api_key at your RouterLink key).

Base URL: https://router-link.world3.ai/api — the SDK appends /v1/messages automatically. Make sure to replace <ROUTERLINK_API_KEY> with your API key from RouterLink.

Curl
Python
Node.js

curl https://router-link.world3.ai/api/v1/messages \
  -H "x-api-key: <ROUTERLINK_API_KEY>" \
  -H "Content-Type: application/json" \                                                                                                                                
  -H "anthropic-version: 2023-06-01" \
  -d '{                                                                                                                                                                
    "model": "anthropic/claude-opus-4-6",                                                                                                                                        
    "max_tokens": 1024,
    "messages": [                                                                                                                                                      
      {"role": "user", "content": "Say hello in one short sentence."}
    ]
  }'                                                                                                                                                                   

pip install anthropic

import anthropic                                            

client = anthropic.Anthropic(
    base_url="https://router-link.world3.ai/api",
    api_key="<ROUTERLINK_API_KEY>",
)                                                                                                                                                                      

message = client.messages.create(                                                                                                                                      
    model="anthropic/claude-opus-4-6",                                
    max_tokens=1024,
    messages=[{"role": "user", "content": "Say hello in one short sentence."}],
)                                                                                                                                                                      
print(message.content[0].text)

npm install @anthropic-ai/sdk

import Anthropic from "@anthropic-ai/sdk";                  

const client = new Anthropic({
  baseURL: "https://router-link.world3.ai/api",
  apiKey: process.env.ROUTERLINK_API_KEY,                                                                                                                              
});
                                                                                                                                                                       
const message = await client.messages.create({              
  model: "anthropic/claude-opus-4-6",
  max_tokens: 1024,                                                                                                                                                    
  messages: [{ role: "user", content: "Say hello in one short sentence." }],
});                                                                                                                                                                    
console.log(message.content);                               

Other official SDKs (Java, Go, Ruby, C#, PHP) work the same way — set the SDK’s base URL to https://router-link.world3.ai/api and pass your RouterLink key.

4. Watch your spend

Open Settings → Logs and Settings → Usage to see request volume, latency, and cost broken down by model and key.

Initiate requests through a third-party client

Already using Claude Code, Codex, or another tool that speaks the Anthropic or OpenAI API? Point it at RouterLink and bring your own key — see the Integration Guides for end-to-end setup.

​1. Create an API key

​2. Make your first request (OpenAI-compatible)

​3. Use the native Anthropic SDK

​4. Watch your spend

​Initiate requests through a third-party client

1. Create an API key

2. Make your first request (OpenAI-compatible)

3. Use the native Anthropic SDK

4. Watch your spend

Initiate requests through a third-party client