Indian Mutual Fund vs Portfolio Optimizer

MFapi.in serves free, keyless access to India's mutual-fund NAV history — scheme metadata and full daily NAV time series for 10,000+ schemes registered with AMFI, refreshed six times a day from AMFI's own bulk feed. Responses are plain JSON with no authentication, rate limiting, or usage caps, and the project publishes an interactive Swagger UI covering every endpoint. A live Origin-header probe against the real API host (api.mfapi.in) confirmed CORS is enabled, returning `Access-Control-Allow-Origin: *` — resolving the previously-stored `unknown`.

Portfolio Optimizer is a free, no-signup Web API implementing modern-portfolio-theory algorithms — mean-variance and minimum-variance optimization, risk and performance analytics, backtesting, and factor-model tools — over JSON, so it can be called from Python, Excel, Google Sheets, or any HTTP client without an SDK. The homepage explicitly advertises free access with no registration required, and a live test against a real optimization endpoint (api.portfoliooptimizer.io) returned `Access-Control-Allow-Origin: *` on both a route-not-found and a malformed-payload response, confirming CORS is enabled; the same responses carry a `WWW-Authenticate: Key` header hinting at an optional key for higher throughput, though the observed default rate limit is a modest 1 request/second.