Anthropic API keys
Anthropic Claude API credentials belong in configuration, not in a commit. This page covers where to create one, what it looks like, and how APIKeyConnect stores it without ever being able to read it.
The facts
- Category
- AI & Machine Learning
- API host
api.anthropic.com- Key format
sk-ant-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx- Env variable
ANTHROPIC · CLAUDE- Sensitivity
- High
- Create a key
- https://platform.claude.com/settings/keys
- Documentation
- https://docs.anthropic.com/claude/reference/
A leaked key here bills you and can read or write account data. Treat it like a password: server-side only, rotated on staff changes.
Kinds of Anthropic key
Personal API Key
For individual use
Organization API Key
For team or business use
How APIKeyConnect stores it
The key is encrypted in your browser with AES-256-GCM, under a key derived from your master password with PBKDF2-SHA-256 at 600,000 iterations. The password never leaves your device, and the server holds ciphertext it has no way to open.
What the server can see — and what this design does not protect against — is written out in full on the security page. That section exists because a page with no limits section is marketing.
Questions
Where do I get a Anthropic API key?
Anthropic issues keys from https://platform.claude.com/settings/keys. Once you have it, store it in APIKeyConnect rather than in a .env file you might commit — the key is encrypted on your device with a master password we never receive.
What does a Anthropic API key look like?
Anthropic keys follow the pattern sk-ant-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx. Knowing the shape is useful for spotting one that has been pasted into a commit, a log line, or a support ticket — the places keys leak from most often.
What environment variable should I use for Anthropic?
Most projects use ANTHROPIC, CLAUDE. APIKeyConnect recognises these names, so importing an existing .env maps the value onto Anthropic automatically instead of leaving it as an unlabelled string, and generating a .env writes it back under the same name.
How dangerous is a leaked Anthropic key?
High sensitivity. A leaked key here bills you and can read or write account data. Treat it like a password: server-side only, rotated on staff changes.
Does Anthropic have more than one kind of key?
Yes — Personal API Key, Organization API Key. They differ in scope, so keeping them as separate entries rather than one "the Anthropic key" is what lets you rotate the risky one without touching the others.
Can APIKeyConnect see my Anthropic key?
No. The key is encrypted in your browser with AES-256-GCM under a key derived from your master password (PBKDF2-SHA-256, 600,000 iterations). The password never leaves your device and the server stores ciphertext it cannot open. What the server can see is documented in full on the security page, including what this design does not protect against.