eodhistoricaldata.com

https://eodhistoricaldata.com/

Only EOD data allowed for free users.

Historical dividends API provides

Ex-dividend date
Declaration date
Record date
Payment date
Value
Unadjusted Value
Dividend currency

API for bulk of data for a given day (all companies):

https://eodhistoricaldata.com/financial-apis/bulk-api-eod-splits-dividends/