MarketAux vs Spaceflight News

Marketaux focuses on financial and stock-market news, tagging articles with entities, tickers, and a -1 to +1 sentiment score across over 200,000 entities and 5,000+ sources in 30+ languages. The free plan allows 100 requests/day returning up to 3 articles each; paid Basic through Pro 50K tiers raise both the daily request cap and articles-per-request limit, plus unlock the entity-level Market Stats endpoint. Access is JSON over a single API-key parameter.

Spaceflight News API is a free, keyless aggregator of space and astronomy news, articles, blogs, and reports pulled from NASA, ESA, and dozens of other spaceflight outlets, currently indexing more than 35,000 articles. The v4 API is fully open — no signup or API key needed — and returns paginated JSON with count/next/previous fields, plus a public OpenAPI/Swagger reference at its /v4/docs endpoint.