Short answer
An Anthropic API key is created in the Claude Console. The official key guide explains how to create one but does not state that creating the credential has a separate charge. API use is different: most organizations buy prepaid usage credits before making calls; organizations with an invoiced billing arrangement are billed monthly. (Get your Claude API key; How do I pay for my Claude API usage?)
Some users can apply credits to eligible API use. Official routes include monthly credits for eligible Max, Ultra, and Team subscribers, plus application-based credits for certain research projects. These are conditional benefits, not free API usage for everyone. Free, Pro, and Enterprise plans are not eligible for the monthly subscriber credits. (Monthly API credits for Max, Ultra, and Team plans)
Key, API usage, credits: three different things
- API key: A credential for authenticating requests. Sign in to the Claude Console, open API keys, select Create key, name it, choose an expiration and linked account, then copy and securely store it. The full key appears only once. The official guide does not specify a separate key-generation charge. (Get your Claude API key)
- API usage: Most organizations pay for API and playground use with prepaid credits. Standard new-account setup asks for organization and use-case information, then payment details and account funding before API use. If a prepaid balance runs out, API and playground calls stop until more credits are added. Organizations with an invoicing arrangement are billed monthly instead. (How do I start using the Claude API?; How do I pay for my Claude API usage?)
- Credits: Credits can cover eligible usage up to their balance and under their terms. They may reduce what you pay out of pocket while available, but they are not an unlimited free API or a benefit automatically attached to every key.
A Claude chat subscription and API billing are separate. Subscriber credits apply to specified Claude Platform services; they do not cover Claude Code, extra usage in Claude apps, or other cloud platforms such as Amazon Bedrock. (API credits for Max, Ultra, and Team plans)
Official ways some users can get API credits
Monthly credits with eligible paid plans
Anthropic’s help article says Max, Ultra, and Team plans are eligible if active and in good standing. It lists $100 per month for Max, $200 per month for Ultra, and $20 per Standard Team seat or $100 per Premium Team seat, pooled up to $500 per month for Team. New subscribers can claim after seven days on an eligible plan. Free, Pro, and Enterprise plans are excluded. (Monthly API credits for Max, Ultra, and Team plans)
Unused monthly credits expire at the end of the billing cycle (or monthly for annual plans); they do not roll over. A payment method is not required on Claude Platform to claim or use these credits. They cover the Claude API, Managed Agents, the Agent SDK, and the playground; they do not cover Claude Code, extra usage in Claude apps, or use through other cloud platforms. (API credits for Max, Ultra, and Team plans)
How to claim: On claude.ai in a web browser, open Settings > Billing as a Max or Ultra subscriber, or Organization settings > Billing as a Team Owner or Primary Owner. In API credits, choose Link organization, select or create a Console organization, review the Supplemental Credit Terms, and link it. Max or Ultra claimants must be the subscriber; Team claimants must be a Primary Owner or Owner. In the Console organization, you need the Owner, Admin, or Billing role. You can link only one Console organization, and changing it later requires contacting support, so choose carefully. (Monthly API credits for Max, Ultra, and Team plans)
These are paid subscription plans, so the monthly API credits do not make the subscription itself free. If you are not eligible for subscriber credits, the standard prepaid route is to add usage credits in the Console before using the API, unless your organization has invoiced billing. (How do I pay for my Claude API usage?)
Application-based research credits
Anthropic’s External Researcher Access Program is for researchers working on AI safety and alignment topics the company considers high priority. Applicants submit details about their team and research topic through the application form linked from Anthropic’s program page. Anthropic says submissions are evaluated on the first Monday of each month; successful applicants receive $1,000 in API credits. The program page does not specify a general credit-expiration period, so check the terms associated with an award. (External Researcher Access Program)
Anthropic’s AI for Science Program is for researchers at academic or nonprofit organizations working on scientific research topics the company considers high priority. The official page links to an application form and says applications are evaluated on the first Monday of each month. Successful applicants may receive up to $20,000 in API credits for a six-month period. Check the program page and application terms for current eligibility and conditions. (Anthropic’s AI for Science Program)
Estimate a production API budget
Anthropic’s model-pricing table lists prices in USD per million tokens (MTok), with separate input and output rates. A straightforward estimate is:
Estimated model cost = (input MTok × input price) + (output MTok × output price)
For example, the pricing table lists Claude Sonnet 5.5 at $2 per million input tokens and $10 per million output tokens. If an application uses 100,000 input tokens and 20,000 output tokens each day for 30 days—with no caching or other separately priced features—the arithmetic is:
- Input: 3 million tokens × $2 = $6
- Output: 0.6 million tokens × $10 = $6
- Estimated total: $12 for the month
This is a hypothetical token-usage estimate, not a quote for a particular application. Actual costs depend on the model, measured input and output tokens, and any applicable features or pricing scope. Check the official pricing page for the model you plan to use.
For production, also check your organization’s current rate and spend limits in the Console. Anthropic says limits are set at the organization level and depend on usage tier; new organizations may start in an Evaluation tier with lower limits while account history is established. You can view your organization’s current tier and limits on the Console’s Rate limits page. (Rate limits)
Is a third-party “free Claude API” a free Anthropic key?
No. A proxy is a separate service with its own endpoint, credential, terms, and claims. For example, the Galaxy API GitHub repository describes a Claude proxy that does not require an Anthropic key, asks users for a separate Galaxy API key, and advertises “No Cost.” The repository does not establish the proxy’s current quota, pricing terms, privacy protections, availability, or production suitability. Treat it as a third-party service—not an official free Anthropic key or an official Anthropic offer. (Galaxy API repository)
Bottom line: Create an Anthropic key through the Claude Console for official API access, but budget for API usage unless you have verified credits. Official credit routes have specific plan or research eligibility, claiming steps, and usage terms; none makes API usage free for everyone.
Sources
Get your Claude API key — Claude Platform Docs
How do I pay for my Claude API usage? — Claude Help Center
How do I start using the Claude API? — Claude Help Center
API credits for Max, Ultra, and Team plans — Claude Platform Docs
Monthly API credits for Max, Ultra, and Team plans — Claude Help Center
What is the External Researcher Access Program? — Claude Help Center
Anthropic’s AI for Science Program — Claude Help Center
Pricing — Claude Platform Docs