If you're buying or using Consumer data to fuel your growth, there's one uncomfortable truth you can't ignore: you’re only ever one DSAR or ICO investigation away from a serious fine.

That's why The Data Supermarket has launched the first ever Due Diligence API - a live, tamper-proof verification system that gives buyers and end users full visibility in to where the data came from, how was it collected, and whether it can legally be used by Third Party's.

With more than £200M in fines issued since GDPR enforcement began, and most of them linked to missing audit trails, unclear consent, and no proof of provenance, the DD API isn’t just a new feature — it’s a shift in accountability.

What Is the Due Diligence API & Why Should You Care?

The DD API is an always-on compliance infrastructure that lets buyers and end users instantly verify where a dataset or lead came from — without relying on email chains, offline audits, or blind trust.

It plugs directly in to your workflow and aswers critical questions in milliseconds.

* Where and when was the lead collected?
* What was the legal basis (Consent, Legitimate Interest)?
* Which channels are permitted (email, phone, SMS)?.
* What privacy policy applied at the time?

Every dataset uploaded to The Data Supermarket includes these DD fields by default. Every API response includes traceable, timestamped proof.

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Image source tristique justo et pharetra

If you can’t prove it, you can’t use it. The DD API meets all six of the ICO’s core expectations for due diligence.

Why Should You Try the DD API?

The DD API meets all six of the ICO's core expectations for due diligence and then some.

* Know where your data came from → TDS shows the original source, domain, and collection timestamp. 

* Understand the lawful basis → Consent or Legitimate Interest clearly flagged, with LIA checks shown. 

* Check it was collected fairly → Privacy policy, consent wording, and collector identity included. 

* Ensure use is compatible with original purpose → Allowed channels, purposes, and restrictions are defined per dataset. 

* Respect individual rights → Full DSAR response fields available instantly, including downloadable packs. 

* Do your checks — and document them → Every API call creates a tamper-proof record of your due diligence.

And its fast: The DD API returns verified results in sub 200ms, with manual fall back options and a 30-request-per-minute rate limit for stability and security.

Let’s Hear From You

Most data platforms talk about compliance. This one shows it. So, if you were challenged by a regulator or customer today to prove the origin of your data, could you? If the answer isn’t a confident "yes" — it might be time to take control.

See it for yourself.

No code. No delay. No guesswork. Click below to run a free manual Due Diligence check