9 Best Data Enrichment APIs for B2B in 2026 (Compared)

"Data enrichment API" covers four different products. You send an email, a LinkedIn URL or a company domain, and you get back contact fields, company fields, dated events or a deliverability check. Pick the API by what you send and what you need back, then compare pricing models. The table at the top of this page compares nine APIs on exactly that, with a source link for every vendor fact.

• Contact, lead and email enrichment (email or LinkedIn URL in, person profile out): People Data Labs, Apollo, Lusha, Cognism, ZoomInfo.
• Company enrichment (domain in, company record out): Coresignal, People Data Labs, Clearbit inside HubSpot.
• Signal enrichment (domain or contact in, dated events out): the Autobound Signal API.
• Orchestration (many providers in sequence): Clay.

What a data enrichment API does

A data enrichment API takes a partial record, such as a work email or a company domain, and returns more data about it as JSON. You call it from your own code, CRM workflow or data pipeline, so it runs at the moment a lead arrives or on a schedule over your whole database.

Type	You send	You get back	Typical use
Contact enrichment	Work email, LinkedIn URL or name plus company	Title, seniority, work history, email, phone	Lead routing, form shortening, CRM hygiene
Lead enrichment	A new lead from a form or a list	Contact plus company fields to score and route it	Inbound scoring and routing
Email enrichment	An email address	The person and company behind it, or a deliverability check	Sign-up enrichment, list cleaning
Company enrichment	A company domain	Firmographics (industry, size, location), or events	Segmentation, territories, account research
Signal enrichment	A domain or a contact	Dated events: news, filings, hiring, job changes, funding	Timing outreach, AI agent context, triggers

How we compared these APIs

We read each vendor's public pricing, product and documentation pages and recorded what the vendor itself states: what you send, what you get, how you get access and how it charges. Every vendor fact in the comparison table links to its source, with the date we read it. Where a vendor publishes no price, we say so.

We did not benchmark accuracy or latency, so this page prints no accuracy or speed numbers. Run each API on a sample of 500 of your own records, including won and lost accounts, and compare match rate and correctness field by field. Autobound is on this list; its row uses our published pricing and API facts.

Contact, lead and email enrichment APIs

1. People Data Labs: person and company data for developers

People Data Labs sells person data through APIs, bulk data and data licensing. It is built for teams that build a product on person data at scale. It also sells a company API with its own pricing.

• Send / get: an email, LinkedIn URL or name, and get a person record. Contact data is not included in the free plan.
• Strong fit when: engineers build enrichment into a product and want an API, bulk files or a data license.
• Pricing model: person data has a free plan at $0/mo, Pro from $98/mo and Enterprise at custom pricing. Company data is free up to 100 records a month, with Pro from $100/mo.

Comparing options? See People Data Labs alternatives.

2. Apollo: enrichment bundled with sequencing

Apollo sells a contact database with email sequencing, call recording and pipeline tools. Apollo states access to 240M contacts and 30M companies.

• Send / get: enrich contacts and companies in the app or through CRM integrations; API access comes with Custom plans.
• Strong fit when: sales teams want contact data and sequencing in one tool.
• Pricing model: a free Starter plan, paid plans by seat with credits, and Custom plans that include API access.

See Apollo alternatives.

3. Lusha: contact reveals on one credit balance

Lusha reveals verified emails and phone numbers for named prospects. Its pricing page describes one credit balance across the Lusha workspace, browser extension, API and MCP server.

• Send / get: a person, and get a verified email (1 credit) or a phone number (5 credits).
• Strong fit when: reps and small teams need emails and direct dials for named prospects, and want the same credits in the API.
• Pricing model: a Free plan with up to 40 credits a month, then Starter, Pro, Premium and Scale plans.

4. Cognism: contact enrichment with a Europe focus

Cognism sells B2B contact data with phone-verified mobiles, a prospecting platform and CRM enrichment, with MCP and API access listed in its plans.

• Send / get: a contact, and get emails, mobiles, job title, work history, company revenue, headcount and technology usage.
• Strong fit when: you sell into Europe and need compliant contact data.
• Pricing model: a seat subscription with 5 seats included and credits; 1 credit reveals 1 contact.

See Cognism alternatives.

5. ZoomInfo: contacts, companies and intent in one platform

ZoomInfo is an AI go-to-market platform. It states 500M+ contacts and 100M+ companies, plus intent and behavioral signals, delivered in apps, CRM and stack integrations, and headless through GTM.AI.

• Send / get: contacts and companies, enriched in the platform, in your CRM or headless.
• Strong fit when: B2B teams with 100+ employees run outbound, ABM and CRM data work from one vendor.
• Pricing model: free to start, then consumption credits based on usage.

See ZoomInfo alternatives.

Company enrichment APIs

6. Coresignal: company, employee and job data from the public web

Coresignal sells public web data on companies, employees and job postings, as database APIs and as JSON or CSV datasets with history. Coresignal states 70M+ company records, 907M+ employee profiles and 482M+ job postings.

• Send / get: a company, and get its record, employees or job postings.
• Strong fit when: data teams model and clean raw records themselves, for sales tech, research or lead enrichment.
• Pricing model: API plans from $49/month (Mini) to $5,000/month (Elite), billed in credits, with a 7-day free trial.

See Coresignal alternatives.

7. Clearbit (HubSpot): enrichment inside the CRM

Clearbit has joined HubSpot. Its lead, contact and account data, with NAICS, GICS and SIC industry codes and corporate hierarchies, now enriches records inside HubSpot automatically, continuously or by hand.

• Send / get: a HubSpot contact or company, and get its fields filled in, plus form shortening.
• Strong fit when: you run on HubSpot and want records filled in without writing code.
• Pricing model: sold through HubSpot. HubSpot states that data enrichment does not consume HubSpot Credits.

Outside HubSpot? See Clearbit alternatives.

Signal enrichment API

8. Autobound Signal API: what changed at the account

Contact and company APIs tell you who someone is and what a company looks like. The Autobound Signal API tells you what just happened there. Send a company domain or a contact, and get back dated, sourced events: news, SEC filings, hiring changes, job changes, funding, posts, podcasts and more, in one JSON shape.

• Company enrichment: POST /v1/companies/enrich takes a domain (or company_name or linkedin_url). Filter with signal_types, signal_subtypes and detected_after. See the company enrichment API.
• Contact enrichment: POST /v1/contacts/enrich takes a contact_email or contact_linkedin_url and returns that person's signals. See the contact enrichment API.
• Delivery: REST API, an MCP server for Claude, ChatGPT and Cursor, GCS push and flat files.
• Strong fit when: you already have contact data and need a reason to reach out, a trigger for a workflow or context for an AI agent.
• Consider another API when: you need emails and phone numbers. Autobound sells signals, not a contact database.
• Pricing model: 2 credits per signal returned. Calls that return nothing are free, and new accounts get free credits. See pricing.

Enrichment orchestration

9. Clay: many providers in one workflow

Clay runs enrichment and GTM workflows that call data and AI from vendors in its marketplace. Teams use it for waterfall enrichment: try one provider, then the next for records the first one missed.

• Send / get: a table of records, and get columns filled in by the providers you chain together.
• Strong fit when: GTM engineers want to combine several providers without writing orchestration code.
• Pricing model: a Free plan, then Launch, Growth and Enterprise plans billed in actions and data credits. Clay API access is on Enterprise.

Data enrichment API pricing compared

Enrichment APIs charge in four ways. Compare the cost of the records you actually keep, not the list price per call.

Pricing model	How it works	Examples (vendor-stated)
Monthly plan with a record allowance	A set number of records each month, more on bigger plans	People Data Labs: free plan, Pro from $98/mo (person) or $100/mo (company)
Credits	Each reveal or result spends credits	Lusha: 1 credit per email, 5 per phone. Coresignal: API plans from $49/month in credits
Seats plus credits	Per-user plans with a credit allowance	Apollo, Cognism (5 seats included)
Per result	You pay only for results returned; empty calls are free	Autobound: 2 credits per signal returned, self-serve credit packs

Four questions decide the real price: Does a call with no match cost anything? Do unused credits expire? Are API calls on every plan, or only on custom contracts? May you store the data after the contract ends?

How to choose the right enrichment API

This guide covers APIs you call from your own code. If you want a ready-made app with a dashboard, see our comparison of B2B data enrichment platforms.

Choose by use case

Your need	Start with	Why
Person data inside your own product	People Data Labs	APIs, bulk data and data licensing
Enrichment plus outreach in one tool	Apollo	Contact data and sequencing together
Emails and direct dials on credits, also by API or MCP	Lusha	One credit balance across app, API and MCP
Contact data for Europe	Cognism	Phone-verified mobiles, compliant data
Contacts, companies and intent from one vendor	ZoomInfo	One platform, headless access
Raw company, employee and job data	Coresignal	APIs and datasets with history
Enrichment inside HubSpot	Clearbit (HubSpot)	Native to the CRM
What just changed at an account	Autobound Signal API	Dated, sourced events by domain or contact
Several providers in sequence	Clay	Waterfall enrichment without code

Choose by data type

• Emails and phones (contact enrichment): People Data Labs, Apollo, Lusha, Cognism, ZoomInfo.
• Company attributes (company enrichment): Coresignal, People Data Labs, Clearbit, ZoomInfo.
• Events and signals (signal enrichment): the Autobound Signal API.
• Buyer intent: see our intent data providers comparison.
• All of the above, chained: Clay, or your own waterfall enrichment code.

Most teams combine two layers: a contact enrichment API for who to reach, and a signal API for when to reach them. Join them on the company domain and the work email. For the wider tool landscape, see our best B2B sales intelligence tools comparison and the B2B data providers guide.

Last updated October 16, 2026. Vendor facts come from each vendor's public pages, read on the dates shown in the comparison table. Plans change, so confirm with each vendor.