Start calling Claude, GPT & Gemini in 3 steps
No credit card, no new SDK to learn. Sign up, copy a key, change one line of code — your first AI API call is minutes away.
ClaudeN AI gives you one API key for Claude, GPT and Gemini through OpenAI- and Anthropic-compatible endpoints. New accounts get $5 free credit, and you can top up with USDT or PayPal — no overseas credit card required. To migrate existing code, change only the base_url to https://clauden.ai/v1 and use your ClaudeN key.
The 3-step lazy deploy
Compatible with OpenAI SDK · Anthropic SDK · cURL
Sign up & claim $5 free credit
Create an account with your email — no credit card needed. Your trial credit is ready right after email verification.
Copy your API key
Open the console, create a key (it starts with sk-) and copy it. Keep it secret — treat it like a password.
Change one line — the base URL
Point your OpenAI or Anthropic SDK at ClaudeN and keep everything else the same. That is the whole migration.
https://clauden.ai/v1
https://clauden.ai/v1/anthropic
Copy-paste quickstarts
Pick your language or tool. Every snippet below is complete and runnable — paste it, insert your key, done.
Test the API straight from your terminal — nothing to install. Replace $CLAUDEN_API_KEY with your key.
curl https://clauden.ai/v1/chat/completions \
-H "Authorization: Bearer $CLAUDEN_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-sonnet-4-6",
"messages": [{"role": "user", "content": "Hello!"}]
}'
Use the official OpenAI Python SDK you already know. Only api_key and base_url change.
# pip install openai
from openai import OpenAI
client = OpenAI(
api_key="sk-...", # your ClaudeN API key
base_url="https://clauden.ai/v1",
)
resp = client.chat.completions.create(
model="claude-sonnet-4-6", # or "gpt-5.4" / "gemini-3.5-flash"
messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)
Prefer the Anthropic SDK? Point it at our Anthropic-compatible endpoint and call Claude directly.
# pip install anthropic
from anthropic import Anthropic
client = Anthropic(
api_key="sk-...", # your ClaudeN API key
base_url="https://clauden.ai/v1/anthropic",
)
msg = client.messages.create(
model="claude-sonnet-4-6",
max_tokens=1024,
messages=[{"role": "user", "content": "Hello!"}],
)
print(msg.content[0].text)
The official openai npm package works out of the box — set baseURL and your ClaudeN key.
// npm install openai
import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.CLAUDEN_API_KEY,
baseURL: "https://clauden.ai/v1",
});
const resp = await client.chat.completions.create({
model: "gpt-5.4", // or "claude-sonnet-4-6" / "gemini-3.5-flash"
messages: [{ role: "user", content: "Hello!" }],
});
console.log(resp.choices[0].message.content);
Already have working OpenAI code? This is the entire diff: add base_url and swap in your ClaudeN key.
- client = OpenAI(api_key="sk-your-openai-key")
+ client = OpenAI(api_key="sk-your-clauden-key",
+ base_url="https://clauden.ai/v1")
One key, any model
Switching between Claude, GPT and Gemini is just changing the model string — same key, same endpoint, same code. See the pricing page for the full live model list.
"model": "claude-sonnet-4-6" # Claude (Anthropic)
"model": "gpt-5.4" # GPT (OpenAI)
"model": "gemini-3.5-flash" # Gemini (Google)
Claude
Strong at coding, long documents and careful writing.
GPT
A versatile all-rounder, including image generation with gpt-image-2.
Gemini
Fast and cost-effective for high-volume and multimodal tasks.
Plug it into your favorite tools
Anywhere an app accepts an “OpenAI-compatible” provider, paste the ClaudeN base URL and your key. Short recipes for popular tools:
Cursor
- Open Cursor Settings → Models.
- Enable “Override OpenAI Base URL”, enter https://clauden.ai/v1, then paste your ClaudeN key in the OpenAI API Key field.
- Add a model name such as claude-sonnet-4-6 or gpt-5.4 and verify.
Cline
- In VS Code, open Cline settings and choose “OpenAI Compatible” as the API provider.
- Set Base URL to https://clauden.ai/v1 and paste your ClaudeN API key.
- Enter a model ID such as claude-sonnet-4-6 and start chatting.
LangChain
- Install langchain-openai (pip install langchain-openai).
- Create ChatOpenAI(model="claude-sonnet-4-6", api_key="sk-...", base_url="https://clauden.ai/v1").
- Use it in your chains and agents as usual — switch models by changing the model string.
Continue
- Open the Continue extension config (config.json / config.yaml).
- Add a model with provider “openai”, apiBase https://clauden.ai/v1 and your ClaudeN key.
- Set the model to claude-sonnet-4-6 (or any other) and reload.
Any OpenAI-compatible app
- Find the “OpenAI-compatible” / “custom provider” / “base URL” setting.
- Paste https://clauden.ai/v1 as the base URL and your ClaudeN key as the API key.
- Pick a model name from our pricing page — Claude, GPT and Gemini all work.
What will you build first?
Five starter ideas — each is one API call away.
AI chatbot
A working Python chatbot in about 30 minutes: loop over messages, keep history, stream replies.
Batch summarizer
Feed documents or tickets through the API in a loop and get clean summaries — a great first automation.
Image generation
Call gpt-image-2 with the same key to generate images alongside your text workflows.
Coding assistant
Wire Claude into Cursor or Cline and get an AI pair programmer inside your editor.
RAG over your docs
Combine LangChain with ClaudeN to answer questions from your own documents.
If something goes wrong
The four errors beginners actually hit, and the fix for each.
| Error | What it means & how to fix it |
|---|---|
401 | Invalid or missing API key. Check that the Authorization header carries your ClaudeN key (Bearer sk-...) and that base_url points to https://clauden.ai/v1 — not the provider's own URL. |
402 | Insufficient balance. Top up on the billing page; requests resume immediately after the credit arrives. USDT is credited after on-chain confirmation. |
404 | Unknown model name or wrong endpoint path. Copy the exact model name from the pricing page and re-check the base URL. |
429 | Rate limited. Slow down or retry with exponential backoff; spread batch jobs over time. |
Quickstart FAQ
How fast can I really start?
About 3 minutes: register and verify your email, create an API key in the console, paste one of the snippets above. The $5 free credit means you can test without paying anything.
Do I need a credit card?
No. The trial credit is free, and top-ups use USDT (TRC20/ERC20/BEP20) or PayPal — no overseas credit card required.
Do I have to rewrite my code?
No. ClaudeN is OpenAI- and Anthropic-compatible: keep your SDK and code, change only the base_url and the API key.
How do I switch between Claude, GPT and Gemini?
Change the model string in your request — e.g. claude-sonnet-4-6, gpt-5.4 or gemini-3.5-flash. Same key, same endpoint.
Which tools can I plug this into?
Cursor, Cline, Continue, LangChain and any app with an “OpenAI-compatible” or custom base URL option. Set the base URL to https://clauden.ai/v1 and paste your key.
Ready in three steps
Sign up, copy your key, change one line. Your first Claude, GPT or Gemini call is minutes away.
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