Anthropic Messages API
Send prompts to Claude from your browser — streaming, system prompts, your key stays local.
Runs online in your browserNo installNo accountFree
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Send prompts to Claude from your browser — streaming, system prompts, your key stays local.
Runs online in your browserNo installNo accountFree
# At least one user message is required. curl https://api.anthropic.com/v1/messages
Your key and prompts go straight from this browser to Anthropic — nothing touches our server. By default your key is kept in memory only; checking "Remember on this device" stores it in localStorage for your convenience.