1 month ago - Important: If you have an ANTHROPIC_API_KEY environment variable set on your system, Claude Code will use this API key for authentication instead of your Claude subscription (Pro, Max, Team, or Enterprise plans), resulting in API usage charges rather than using your subscription's included usage.

June 24, 2025 - If you're a Cline user with a Claude Max subscription, you can connect your account to save on token costs. Instead of paying per token via an API key, the Claude Code provider lets you leverage your existing subscription for all your development tasks in Cline.

June 15, 2025 - $ claude --print "Hello world" # CLI checks for ANTHROPIC_API_KEY ✓ (found) # CLI validates API credits ✗ (balance is zero) # Result: "Credit balance is too low" $ ~/.local/bin/claude_max "Hello world" # CLI checks for ANTHROPIC_API_KEY ✗ (removed by our script) # CLI checks for OAuth token ✓ (found) # CLI validates subscription ✓ (Claude Max active) # Result: "Hello!

May 19, 2025 - This looks fantastic; however I am currently using Claude Code through a Max subscription instead of via API key. Is it (or will it be) possible to authenticate through the app to connect to a user's Max subscription?

4 days ago - This section provides inference parameters and code examples for using the Anthropic Claude Messages API.

ID of the API key.

June 20, 2025 - Now we can configure the API Key Helper we set up earlier. We do this after the skeleton otherwise it would be overwritten. claude config set --global apiKeyHelper ~/.claude/anthropic_key_helper.sh

September 1, 2025 - There are two ways to gain access to Claude Code, with different pricing: One way is through a subscription to the Claude Pro or Max plans. Claude Pro subscription or a Max subscription includes access to use Claude Code directly in your terminal. The other way is to pay per usage via Claude API, where you pay for the API cost directly to Anthropic (as discussed in the previous section).

November 16, 2024 - Okay, so I’m a newbie so go easy on me. This might be dumb but I can’t for the life of me figure out how to get or find a Claude API key. I am wondering if someone can explain how I can get a claude API key from Anthropic. I have two questions basically. How/where do I get the Claude api key?

Build with the Claude API

Learn more about extending Claude's capabilities with Agent Skills. ... curl "https://api.anthropic.com/v1/organizations/api_keys/apikey_01Rj2N8SVvo6BePZj99NhmiT" \ --header "anthropic-version: 2023-06-01" \ --header "content-type: application/json" \ --header "x-api-key: $ANTHROPIC_ADMIN_KEY"

February 9, 2025 - 4. Secure Your Key: Copy the generated key and store it securely in a password manager. You won't be able to retrieve it later. Claude API enforces usage limits to ensure fair access and optimal performance for all users. These limits define the maximum amount you can utilise the API within a specific timeframe (typically a month).

April 6, 2025 - Bug Description I'm on a Max plan, but Claude incorrectly used my API key in a session and used almost $14 of usage on my API account. I didn't see any indication that this was the case unt...

An API key · cURL · cURL · Python · Python · TypeScript · TypeScript · Java · Java · Now that you have made your first Claude API request, it's time to explore what else is possible: Working with Messages · Learn common patterns for the Messages API.

The header should be named "Authorization" and the value should be "Bearer " followed by your API key. Anthropic Claude API keys are sensitive information and should be treated with care.

July 8, 2024 - If you want to add this to the body, you can do so just below the "max_tokens" key/value pair. Two important notes here: Number values don't need quotes around them. Always finish each line with a comma. Curious? You can click Send and see how that changes the output. Postman can only test APIs. If you're using a SaaS app that accepts a Claude key, the app will handle all the functionality without setting up calls—you just have to provide the API key.

November 18, 2025 - Learn how to leverage your flat Claude Pro/Max subscription for API-like behavior by extracting OAuth tokens using mitmproxy - no complex implementation required.