Callio
callio.dev
A unified API gateway and MCP server that lets AI agents and applications call 170+ external APIs through a single Callio key with credential injection and telemetry.
The Callio API uses Bearer token authentication; has freemium pricing; offers a free tier (500 proxy requests/month, 2 sandbox keys, free forever); rate limits: Monthly request quotas per plan; over-limit requests return 429 until next billing period; sandbox traffic not counted; custom rate limits on Scale/Enterprise. Verified 2026-07-27 with per-field source links.
Pricing
Free (500 req/mo); Builder $49/mo (10,000 req); Pro $149/mo (50,000 req); Scale $499/mo (250,000 req); Enterprise custom
callio.dev ↗Rate limits
Monthly request quotas per plan; over-limit requests return 429 until next billing period; sandbox traffic not counted; custom rate limits on Scale/Enterprise
callio.dev ↗OpenAPI spec
not documented null
no sourceMCP server
Native MCP server installable via npx callio-mcp (Cursor, Claude Desktop, Claude Code)
callio.dev ↗