Membership
The Prompt Bench website is free, and stays free. A membership is a one-off payment that opens the MCP tools and the agent API, so your own AI assistant can compose prompts with Prompt Bench and Persona Bench directly.
Welcome
Confirming your payment…
This is your membership token. It is shown once. Copy it somewhere safe now: Prompt Bench keeps only a fingerprint of it and cannot show it again.
What you get
Free for everyone
- The website: Studio, Classic, Persona
With a membership
- The MCP tools
- The agent API
Price to be announced
Not on sale yet
Payment is handled by Stripe. Prompt Bench never sees your card.
Connect your assistant
The MCP server is /mcp. Send your token in the Authorization header.
Claude Code
claude mcp add --transport http prompt-bench https://…/mcp --header "Authorization: Bearer YOUR_TOKEN"
Any client that takes a URL and headers
URL: https://…/mcp (HTTP transport) Header: Authorization: Bearer YOUR_TOKEN
Plain HTTP
curl -H "Authorization: Bearer YOUR_TOKEN" "https://…/api/agent/compose?brief=a+risograph+poster"
Clients that only sign in through a web page (such as some connector directories) are not supported yet.
Your membership
Paste your token to see your membership, your tokens and how much you have used. The token stays in this page only; it is never saved or put in the address bar.