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APIStack

100+ production REST APIs and MCP servers with one API key. Free tier included.

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Overview

100+ production REST APIs and MCP servers: validation, dates, finance calculators, web and SEO tools, reference data and AI text tools. One API key, free tier included.

AI summary

APIStack offers a collection of over 100 production REST APIs and MCP servers designed to provide precise data for various applications, including validation, finance, and web tools. Users can access these APIs with a single API key, and a free tier is available.

Sources behind this listingSee source links, recorded dates and owner corrections.

Observed facts come from public pages. Founder-edited facts are supplied by the verified owner. AI-inferred facts are model interpretations; derived facts are calculated from other data. A source link lets you check the current page. It does not guarantee the fact is still current.

Dates show when a record was saved. Some older records use the listing’s update date; they are not proof of a fresh check. Missing source records are shown explicitly.

Tagline100+ production REST APIs and MCP servers with one API key. Free tier included.
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Description100+ production REST APIs and MCP servers: validation, dates, finance calculators, web and SEO tools, reference data and AI text tools. One API key, free tier included.
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Free planYes
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Free trialNot stated
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SummaryAPIStack offers a collection of over 100 production REST APIs and MCP servers designed to provide precise data for various applications, including validation, finance, and web t...
AI-inferredRecorded Source link unavailable

Who Is It For

Best for

Developers and businesses seeking reliable APIs for validation, financial calculations, and reference data without the need for extensive setup.

–Not for

Users looking for a wide range of integrations or those needing advanced features beyond the basic API functionalities.

Strengths & Weaknesses

Biggest strength

The ability to access multiple APIs with a single key, providing a streamlined experience for retrieving accurate data across various domains.

Classification

Likely competitors
RapidAPIPostmanProgrammableWeb

Alternatives to APIStack

See all alternatives to APIStack

Community

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How we sourced this: Observed fields () were crawled from https://apistack.online/ when recorded. Source links and dates are available above. AI-inferred fields () were generated by gpt-4o-mini and are always labelled, never presented as measured fact. Last updated: 19 October 2026. Is this your tool? Claim it to edit and get a do-follow badge.