Clearbit use to be one of the best solutions and somehow affordable .. even a number of Free APIs and free credits.. then they got enterprise traction and got greedy . They claim have solutions for any size of business.. proving that you can pay 20K a year . yeap ¡ And is not that they product is not much accurate or more complete , is similar to what it was . I have actually tried and you can see if you use products like Intercom , who are using the service.
Anyway you can use top quality products at a fraction of the price and even have the enrichment integrated in your flow , so if you add a number of emails to one of your flows , the entries gets automatically updated with their latest social data