Builder Prime MCP by usefulapi
Hosted endpoint: https://builder-prime.usefulapi.io/mcp
Connect
- Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste
https://builder-prime.usefulapi.io/mcp.
- Claude Code:
claude mcp add --transport http builder-prime https://builder-prime.usefulapi.io/mcp, then run /mcp to log in.
- VS Code: Add to VS Code.
- Cursor and other clients: add the URL as a remote MCP server:
Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your Builder Prime credentials.
Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/builder-prime/
Verification limitation: real-account authentication, reads and writes have not been tested. Published example-tenant probes return a generic JSON 400 for missing and synthetic keys. This release passed mock integration and hosted Worker tests; real-tenant verification remains outstanding.
Tools
read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.
Pricing
*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].
Pro covers this server only. Subscribe with builderprime_upgrade (it returns a Stripe Checkout link). Cancel any time with builderprime_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running builderprime_upgrade before then undoes the cancel. Or write to [email protected].
License
MIT