How Do You Automate B2B Lead Generation Using APIs?

[NightHollow]

I'm looking into automating parts of the B2B lead generation process, particularly identifying relevant companies and decision-makers based on industry, company size, location, and job titles.

The idea is to build a workflow that gathers company information, enriches contact records, and sends structured data directly into a CRM instead of relying on manual research.

For those who have built similar systems, which APIs and automation tools worked best? I'm especially interested in solutions that provide accurate company data and integrate well with existing sales platforms.

Would you recommend building a custom solution or using a combination of existing API services?