Get an API key and add it to your apps

A key gives you your own quota, unlocks network tools (fetch a URL, DNS, WHOIS, SSL) and the larger AI models. Compute, text, PDF and Korean tools also work without one.

1. Get the key

Free key: open /api-keys/, enter your email and copy the key that appears (it looks like ttdu_free_…). It is shown once; we keep only a one-way hash, so store it in a password manager.
Paid plan or credit pack (when sales open): choose a plan on /pricing/ and pay. You return to /api-keys/claim/, which shows a new key once. If you bought with an email that already has a key, that key is upgraded instead and you keep using it.

Check it works:

curl https://toolsthatdontupload.com/api/keys/usage -H "X-API-Key: ttdu_free_xxxxxxxxxxxxxxxxxxxxxxxx"

You should see your plan, credits used and credits left.

2. Add it where you use it

Where	What to do
REST / curl	Send it in the `X-API-Key` header on every call: `curl -X POST https://toolsthatdontupload.com/api/dns-lookup \ -H "Content-Type: application/json" -H "X-API-Key: ttdu_free_xxxxxxxxxxxxxxxxxxxxxxxx" \ -d '{"domain":"example.com"}'`
Python	`import os, requests r = requests.post("https://toolsthatdontupload.com/api/ai-summarize", headers={"X-API-Key": os.environ["TTDU_KEY"]}, json={"text": "...", "quality": "high"}) print(r.json())`
JavaScript	`await fetch("https://toolsthatdontupload.com/api/whois", { method: "POST", headers: { "Content-Type": "application/json", "X-API-Key": process.env.TTDU_KEY }, body: JSON.stringify({ domain: "example.com" }) });`
Claude (claude.ai, Desktop)	Customize → Connectors → Add custom connector → URL `https://toolsthatdontupload.com/mcp`. When a tool needs an account, Claude shows Connect; on our sign-in page, paste your key in the "existing API key" box and click Allow. Your connector then uses that key's plan.
Claude Code	`claude mcp add --transport http tools-that-dont-upload https://toolsthatdontupload.com/mcp --header "X-API-Key: ttdu_free_xxxxxxxxxxxxxxxxxxxxxxxx"`
Cursor	`~/.cursor/mcp.json`: `{ "mcpServers": { "tools-that-dont-upload": { "url": "https://toolsthatdontupload.com/mcp", "headers": { "X-API-Key": "ttdu_free_xxxxxxxxxxxxxxxxxxxxxxxx" } } } }`
VS Code	`.vscode/mcp.json`: `{ "servers": { "tools-that-dont-upload": { "type": "http", "url": "https://toolsthatdontupload.com/mcp", "headers": { "X-API-Key": "${input:ttdu-key}" } } }, "inputs": [{ "id": "ttdu-key", "type": "promptString", "password": true, "description": "TTDU API key" }] }`
ChatGPT (Custom GPT Action)	Actions → Import from URL `https://toolsthatdontupload.com/openapi.json` → Authentication: API Key, Auth type Custom, header name `X-API-Key`, paste the key.
n8n / Make / Zapier	HTTP Request node → add header `X-API-Key` with the key (store it as a credential, not in plain text).

3. Keep it safe

Never put the key in front-end code, a public repo or a shared prompt.
Lost or leaked? Revoke it: curl -X POST https://toolsthatdontupload.com/api/keys/revoke -H "X-API-Key: ttdu_free_xxxxxxxxxxxxxxxxxxxxxxxx", then create a new one.
Response headers X-Credits-Used, X-Credits-Limit and X-Credits-Cost show what each call cost. Prices: /pricing/.

Want Claude or ChatGPT quality for translate, summarize and OCR? See AI upgrade.

한국어 요약

키 받기: /api-keys/에서 이메일을 넣으면 ttdu_free_… 키가 한 번만 보입니다. 저희는 원본을 저장하지 않으니 바로 복사해 두세요. 유료 결제(판매 시작 후)는 /pricing/ → 결제 → /api-keys/claim/ 에서 새 키가 한 번 보이고, 같은 이메일에 키가 있으면 그 키가 업그레이드됩니다.
확인: 위 /api/keys/usage 명령으로 남은 크레딧이 나오면 정상입니다.
등록: 코드에서는 모든 요청에 X-API-Key 헤더를 넣습니다. Claude 앱은 커넥터 추가 → 연결(Connect) 화면의 "기존 API 키" 칸에 붙여넣기, Claude Code·Cursor·VS Code는 위 설정의 headers 에, ChatGPT 맞춤 GPT는 Actions 인증을 API Key / Custom / 헤더 이름 X-API-Key 로 설정합니다.
유출 시: /api/keys/revoke 로 바로 폐기하고 새로 만드세요.