# usefulapi.io documentation

Research date: 2026-09-07

Documentation coverage: partial.

Reference index, not a mirror of complete vendor documentation. Retrieved pages do not prove the MCP works.

## What it does

A hosted catalogue of 146 single-application MCP servers, one per SaaS product, each on its own subdomain, wrapping that product's public REST API as a named tool list with per-tool read and write labels and the underlying REST call documented against each tool.

## Access and connection

MCP support: official

Access requirements: free - every server page publishes the same two tiers, "Free 100 tool calls / month" and "Pro $9/mo" or "$90/yr", which is the cheapest paid tier of any gateway in this file.

Authentication: per-application OAuth. The setup instructions add the subdomain as a custom connector and the user then authenticates with the wrapped vendor when prompted, so usefulapi brokers the connection rather than taking an API key up front.

Research checked: 2026-09-07

These details come from catalog research. Check vendor sources for current setup instructions; this is not proof of a tested connection.

## Sources

- https://usefulapi.io/
- https://usefulapi.io/aircall
- https://pipedrive.usefulapi.io/mcp
- https://github.com/m190/usefulapi-mcp

## Retrieved pages

- https://github.com/m190/usefulapi-mcp/issues (fetched)
- https://github.com/m190/usefulapi-mcp/forks (fetched)
- https://github.com/m190/usefulapi-mcp/tags (fetched)
- https://github.com/m190/usefulapi-mcp/actions (fetched)
- https://github.com/m190/usefulapi-mcp (fetched)
- https://github.com/m190/usefulapi-mcp/pulse (fetched)
- https://github.com/m190/usefulapi-mcp/pulls (fetched)
- https://github.com/m190/usefulapi-mcp/activity (fetched)