NASA ADS
harvard.edu
NASA Astrophysics Data System, a digital library portal for researchers in astronomy and physics.
The NASA ADS API terms not fully documented by the vendor. Verified 2026-07-12 with per-field source links.
Base URL
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no sourceAuth
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no sourceFree tier
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no sourcePricing model
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no sourcePricing
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no sourceRate limits
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no sourceOpenAPI spec
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no sourceMCP server
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no source