Real-time B2B people and company intelligence with additive per-credit enrichment pricing and a first-class MCP server for AI agents.
Documentation & DX
96
Reliability
95
Ecosystem & SDKs
95
Accessibility
97
Category report · 7 providers evaluated
Best Data Enrichment APIs
Data Enrichment APIs turn a thin identifier (email, domain, name, LinkedIn URL) into a full person or company profile: firmographics, contact details, job history, social and intent signals. The category splits into developer-first API houses with self-serve keys and transparent credit pricing (People Data Labs, Crustdata, Apollo, FullContact) and enterprise/sales-gated or platform-bundled players (ZoomInfo, Clearbit-now-Breeze inside HubSpot, Clay). Compare on documentation/DX, reliability and proven scale, ecosystem (SDK languages, MCP, webhooks), and accessibility, how fast a developer or AI agent can sign up, get a key, and ship without a sales call. Note: Proxycurl, a former category staple, permanently shut down on July 4, 2025 after a LinkedIn lawsuit and is excluded.
What is the best Data Enrichment API?
| # | Provider | Documentation | Reliability | Ecosystem | Accessibility | ABI | Free |
|---|---|---|---|---|---|---|---|
| 1 | 96 | 95 | 95 | 97 | 95.7A+ | Yes | |
| 2 | 88 | 82 | 80 | 90 | 84.9B | Yes | |
| 3 | 80 | 84 | 78 | 78 | 80.1B | Yes | |
| 4 | 70 | 70 | 62 | 72 | 68.4C | Yes | |
| 5 | 70 | 90 | 72 | 30 | 67.5C | No | |
| 6 | 65 | 75 | 60 | 68 | 66.9C | Yes | |
| 7 | 58 | 80 | 55 | 42 | 59.6D | No |
Table 1. Best Data Enrichment APIs ranked by the APIbenchmarks Index. Specification columns are vendor-stated; ABI is computed per the published methodology.
Composite scores
Crustdata
95.7
People Data Labs
84.9
Apollo.io
80.1
FullContact
68.4
ZoomInfo
67.5
Clay
66.9
Clearbit (Breeze Intelligence)
59.6
Scale 0–100. Highest in category: 95.7.
Figure 1. APIbenchmarks Index for Data Enrichment APIs, bar length proportional to composite score; colour encodes letter grade.
Provider scorecards
Developer-first person and company data API with a clean self-serve free tier, multi-language SDKs, and a dedicated status page.
Documentation & DX
88
Reliability
82
Ecosystem & SDKs
80
Accessibility
90
Sales-platform giant whose enrichment API rides on a massive contact DB, with a generous credit free tier but API depth gated behind paid seats.
Documentation & DX
80
Reliability
84
Ecosystem & SDKs
78
Accessibility
78
Identity-resolution specialist whose API merges fragmented identifiers into unified person profiles; solid free developer tier but dated DX.
Documentation & DX
70
Reliability
70
Ecosystem & SDKs
62
Accessibility
72
Enterprise incumbent with the deepest B2B coverage and proven scale, but fully sales-gated, no public pricing, no self-serve key, contracts from ~$15k+/yr.
Documentation & DX
70
Reliability
90
Ecosystem & SDKs
72
Accessibility
30
Spreadsheet-style enrichment orchestration over 150+ data providers; powerful as a platform but API-as-primitive is thin, built for workflows, not raw API integration.
Documentation & DX
65
Reliability
75
Ecosystem & SDKs
60
Accessibility
68
The former developer-favorite Clearbit API is sunset; enrichment now lives inside HubSpot as Breeze Intelligence, requiring a paid HubSpot plan and credits.
Documentation & DX
58
Reliability
80
Ecosystem & SDKs
55
Accessibility
42
Frequently asked questions
- What is the best Data Enrichment API?
- By the APIbenchmarks Index, Crustdata rates highest (ABI 95.7, grade A+). Real-time data for AI agents and sourcing The ABI weights documentation, reliability, ecosystem, and accessibility; price is reported separately, so the right pick still depends on your budget and workload.
- Which data enrichment APIs have a free tier?
- Crustdata, People Data Labs, Apollo.io, FullContact, Clay offer a free tier or trial credits.
- How is the APIbenchmarks Index calculated?
- The ABI is a weighted composite of four dimensions scored on absolute reference scales: documentation & DX (30%), reliability (25%), ecosystem & SDKs (25%), and accessibility (20%). Price is excluded from the composite because price units are not comparable across categories. The full formula is on the methodology page.
Popular comparisons
Crustdata vs People Data LabsCrustdata vs Apollo.ioCrustdata vs FullContactPeople Data Labs vs Apollo.ioPeople Data Labs vs FullContactApollo.io vs FullContact
References
- https://crustdata.com/pricing
- https://docs.crustdata.com/general/pricing
- https://crustdata.com/
- https://crustdata.com/blog/b2b-data-api-providers
- https://www.producthunt.com/products/crustdata-3/reviews
- https://www.producthunt.com/products/crustdata-2/reviews
- https://prospeo.io/s/crustdata-pricing-reviews-pros-and-cons
- https://composio.dev/toolkits/crustdata
- https://www.g2.com/products/crustdata-apis-or-bulk-datasets/competitors/alternatives
- https://docs.peopledatalabs.com/docs/person-enrichment-api
- https://docs.peopledatalabs.com/docs/company-enrichment-api
- https://support.peopledatalabs.com/hc/en-us/articles/23553812020891-Pricing-Overview
- https://www.g2.com/products/people-data-labs/reviews
- https://syncgtm.com/blog/people-data-labs-review
- https://maildoso.ai/blog/catalog/data-enrichment/people-data-labs
- https://github.com/peopledatalabs/openAPI-specifications
- https://status.peopledatalabs.com/uptime
- https://statusgator.com/services/people-data-labs
- https://docs.apollo.io/reference/people-enrichment
- https://docs.apollo.io/reference/organization-enrichment
- https://docs.apollo.io/docs/api-pricing
- https://docs.apollo.io/reference/rate-limits
- https://www.apollo.io/pricing
- https://www.g2.com/products/apollo-io/reviews
- https://www.trustpilot.com/review/apollo.io
- https://salesmotion.io/blog/apollo-pricing
- https://galadon.com/apollo-io-api
- https://docs.fullcontact.com/docs/enrich-overview
- https://www.fullcontact.com/blog/enrich-api/enrich-api-brings-higher-match-rates-with-multi-field-enrichment-capabilities/
- https://apispine.com/fullcontact/pricing
- https://www.g2.com/products/fullcontact/reviews
- https://www.capterra.com/p/161228/FullContact-Data-Solutions/reviews/
- https://syncgtm.com/blog/fullcontact-review
- https://github.com/fullcontact/fullcontact-go
- https://www.fullcontact.com/developer-portal/
- https://docs.zoominfo.com/
- https://docs.zoominfo.com/docs/credit-usage-and-limits
- https://tech-docs-library.zoominfo.com/enterprise-api-getting-started-guide.pdf
- https://github.com/Zoominfo/api-auth-python-client
- https://www.factors.ai/blog/zoominfo-pricing
- https://www.zoominfo.com/newsroom/press-releases/international-data-expansion-2023
- https://www.g2.com/products/zoominfo-sales/reviews
- https://www.trustpilot.com/review/zoominfo.com
- https://generect.com/blog/zoominfo-api/
- https://www.clay.com/pricing
- https://university.clay.com/docs/http-api-integration-overview
- https://university.clay.com/docs/building-a-data-waterfall
- https://www.clay.com/claygent
- https://www.g2.com/products/clay-com-clay/reviews
- https://prospeo.io/s/clay-reviews
- https://www.cleanlist.ai/blog/clay-data-enrichment-review
- https://www.cleanlist.ai/blog/2026-03-12-clay-pricing-changes-2026
- https://clearbit.com/docs
- https://abmatic.ai/blog/clearbit-enrichment-api-2026
- https://aeroleads.com/blog/clearbit-api-person-company-reveal-endpoints/
- https://derrick-app.com/en/pricing-breeze-intelligence-2/
- https://www.cognism.com/blog/clearbit-pricing
- https://syncgtm.com/blog/clearbit-review
- https://www.g2.com/products/clearbit-enrichment/reviews
- https://github.com/clearbit
- https://api.bouncewatch.com/blog/api-data/clearbit-alternative-enrichment-api