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Best APIs & Data MCP Servers (2026)

APIs & Data MCP servers connect AI assistants to the long tail of third-party services that don't have a dedicated server yet, CRMs, ticketing systems, analytics platforms, weather and maps APIs, government open-data portals, internal REST endpoints. Some are generic HTTP clients with auth helpers; others wrap a specific vendor and translate its quirks into clean tool calls. They're for engineers and ops teams who want an agent that can query Salesforce, pull a Mixpanel funnel, hit an internal admin API, or join data across services without writing a custom backend. The strongest servers here surface clear schemas, handle pagination and rate limits, and let you scope which endpoints the agent can call. Use them as the glue layer between purpose-built MCP servers when an off-the-shelf option doesn't exist for the system you care about.