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Do not build this. The product is contracts with data vendors, not software.

What it does is call a dozen providers in sequence until one returns an answer, and bill you for whichever did. Reproducing that means signing with each of them yourself, at list price, which is more than this costs.

AND THE PART THAT IS NOT COMMERCIAL
- Most of what is being enriched is personal data about people who did not provide it. In the EU and the UK that needs a lawful basis, and buying it from a vendor does not create one
- Several of these providers have been the subject of regulatory action. Using the output is your exposure, not theirs
- So before the build question there is a use question, and it is worth answering honestly

WHAT YOU CAN BUILD, AND SHOULD
**Enrichment from what you already have**, which is free and often better:
- The email domain gives you the company. The company website gives you the description, the technology, sometimes the size and the location — all published deliberately
- Your own mailbox already holds everybody you have dealt with, with dates. That is a better signal than any purchased attribute
- Your own product data tells you what a customer actually does, which no vendor knows
- Record the source and the date on every enriched field, so a stale value is visible rather than trusted

AND THE WATERFALL IDEA, WHICH IS WORTH COPYING
- Try the cheap source first, fall back to the next, stop at the first answer, and record which one answered. That is a good pattern for any lookup and it costs nothing
- Cache by key with an expiry, because the expensive part is asking twice

THE ONE-LINE VERSION
You are buying data contracts and somebody else's compliance risk. Enrich from your own mailbox and the company's own website, and check the rules before using anything bought.