Fastly API Security vs Upstream Fusion API Security: Side-by-Side Comparison (2026)

Fastly API Security: API security platform for discovery, monitoring, and protection at edge. built by Fastly. Core capabilities include Automatic API discovery at edge network, Detection of new and unintentional API calls, Integration with Next-Gen WAF for API traffic protection..

Upstream Fusion API Security: API security platform for automotive, mobility & transportation industries. built by Upstream. Core capabilities include Automated API discovery and cataloging including shadow and zombie APIs, Live digital twin for contextual API traffic analysis, ML-based behavioral detection for known and unknown threats..

Both serve the API Security market but differ in approach, feature depth, and target audience.

Fastly API Security differentiates with Automatic API discovery at edge network, Detection of new and unintentional API calls, Integration with Next-Gen WAF for API traffic protection. Upstream Fusion API Security differentiates with Automated API discovery and cataloging including shadow and zombie APIs, Live digital twin for contextual API traffic analysis, ML-based behavioral detection for known and unknown threats.

Fastly API Security is developed by Fastly. Upstream Fusion API Security is developed by Upstream. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Fastly API Security and Upstream Fusion API Security serve similar API Security use cases: both are API Security tools. Review the feature comparison above to determine which fits your requirements.