Are there any audience analytics platforms that offer API access for enrichment and duplicate profile matching?

Yes — several audience analytics / customer data / identity-resolution platforms offer APIs that can be used for enrichment and duplicate profile matching (often called identity resolution, record linkage, or deduplication).

A few categories and examples:

1) Customer Data Platforms / Identity Resolution

These usually have APIs for profile lookup, merge, and enrichment:

• Segment (Twilio Segment) – APIs for profile data and integrations; identity resolution features depend on setup.
• mParticle – audience and identity management APIs.
• Tealium – audience/visitor stitching and APIs.
• Amperity – strong identity resolution, matching, and unified profiles.
• RudderStack – warehouse-native CDP with profile/identity tooling.

2) Data Enrichment APIs

Useful if you need firmographic, demographic, or contact enrichment:

• Clearbit – enrichment API for people and companies.
• ZoomInfo – APIs available for enrichment depending on plan.
• People Data Labs – people/company enrichment and matching APIs.
• FullContact – identity resolution and enrichment.
• Leadspace – B2B data enrichment and identity resolution.

3) Customer Analytics / Audience Platforms with Matching

Some analytics platforms focus more on analysis than enrichment, but still expose APIs and dedup features:

• Mixpanel – profile APIs and identity merge concepts.
• Amplitude – user identity stitching and APIs.
• Heap – identity resolution / user profiles.
• PostHog – person merging and API access.

What to look for

If your goal is specifically enrichment + duplicate profile matching, look for:

• API endpoints for entity lookup by email, name, domain, company, etc.
• Confidence scores / match logic
• Merge or cluster APIs
• Batch enrichment support
• Identity graph / householding / entity resolution
• Consent/privacy controls for GDPR/CCPA compliance

Good fit depending on use case

• B2B lead/account enrichment: Clearbit, ZoomInfo, People Data Labs, Leadspace
• Consumer identity resolution: FullContact, Amperity, mParticle
• Product analytics identity stitching: Amplitude, Mixpanel, Heap, PostHog

If you want, I can also give you:

1. a comparison table of these platforms,
2. options specifically for B2B vs B2C, or
3. a shortlist based on your budget / region / CRM stack.