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 · 19 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?
Click a column to sort · best value per column highlighted
| Provider | Free | ||||||
|---|---|---|---|---|---|---|---|
| 1 | 96 | 95 | 95 | 97 | 95.7A+ | Yes | |
| 2 | 88 | 82 | 80 | 90 | 84.9B | Yes | |
| 3 | 82 | 80 | 82 | 76 | 80.3B | Yes | |
| 4 | 80 | 84 | 78 | 78 | 80.1B | Yes | |
| 5 | 84 | 80 | 66 | 86 | 78.9B | Yes | |
| 6 | 82 | 70 | 74 | 84 | 77.4B | Yes | |
| 7 | 80 | 78 | 66 | 76 | 75.2B | No | |
| 8 | 76 | 78 | 68 | 72 | 73.7C | Yes | |
| 9 | 80 | 66 | 64 | 80 | 72.5C | Yes | |
| 10 | 78 | 66 | 62 | 82 | 71.8C | Yes | |
| 11 | 80 | 60 | 74 | 62 | 69.9C | No | |
| 12 | 70 | 70 | 62 | 72 | 68.4C | Yes | |
| 13 | 76 | 74 | 68 | 50 | 68.3C | Yes | |
| 14 | 76 | 74 | 66 | 50 | 67.8C | Yes | |
| 15 | 70 | 90 | 72 | 30 | 67.5C | No | |
| 16 | 65 | 75 | 60 | 68 | 66.9C | Yes | |
| 17 | 72 | 66 | 62 | 32 | 60.0D | No | |
| 18 | 58 | 80 | 55 | 42 | 59.6D | No | |
| 19 | 70 | 58 | 50 | 35 | 55.0D | Yes |
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
Bright Data
80.3
Apollo.io
80.1
Hunter
78.9
Explorium
77.4
Coresignal
75.2
Lusha
73.7
FullEnrich
72.5
Prospeo
71.8
Fiber
69.9
FullContact
68.4
Seamless.AI
68.3
RocketReach
67.8
ZoomInfo
67.5
Clay
66.9
Cognism
60.0
Clearbit (Breeze Intelligence)
59.6
ContactOut
55.0
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.
Explore the scores
Documentation & DX
Weight 30% · higher is better
Reliability
Weight 25% · higher is better
Ecosystem & SDKs
Weight 25% · higher is better
Accessibility
Weight 20% · higher is better
Build quality vs accessibility
Up and to the right is better: well built and easy to start with.
Most attractive quadrant: above the median on both axes
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
Web-data infrastructure vendor whose Dataset Marketplace API (Search and Filter, 669M+ LinkedIn people profiles, company and jobs datasets) is self-serve with published $2.50 per 1,000 records pricing, but it ships public profile fields, not verified emails or phones.
Documentation & DX
82
Reliability
80
Ecosystem & SDKs
82
Accessibility
76
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
Email-finding and verification API with clean, well-documented endpoints, a published OpenAPI spec, an MCP server and API access on the free plan, but no official SDKs and narrow person/company depth.
Documentation & DX
84
Reliability
80
Ecosystem & SDKs
66
Accessibility
86
AgentSource business and prospect data API built for AI agents, with a free account, per-credit self-serve packages from $29.99, OpenAPI and llms.txt docs and an MCP server, but no confirmed public status page.
Documentation & DX
82
Reliability
70
Ecosystem & SDKs
74
Accessibility
84
Public-web company, employee and job-posting data via Search/Collect APIs with transparent self-serve credit plans from $49/mo, an MCP server and an Agentic Search API, but no official SDKs and a degraded real-time API on the verification date.
Documentation & DX
80
Reliability
78
Ecosystem & SDKs
66
Accessibility
76
Sales-intelligence platform with a documented v3 REST API (person, company, prospecting, signals, lookalike) and an MCP server; API keys exist on every plan, but the free and Starter tiers are capped at 100 requests/day and credits drain fast.
Documentation & DX
76
Reliability
78
Ecosystem & SDKs
68
Accessibility
72
Waterfall enrichment API across 20+ providers with webhook delivery, v1/v2 OpenAPI specs, an MCP server and a 50-credit no-card trial, but no SDKs, a mixed status record and a weak Trustpilot score.
Documentation & DX
80
Reliability
66
Ecosystem & SDKs
64
Accessibility
80
Email, phone and company data API with 30+ search filters, plan-tiered published rate limits, a free plan that explicitly includes API access and an OAuth MCP server, but credits expire monthly and no official SDK was found.
Documentation & DX
78
Reliability
66
Ecosystem & SDKs
62
Accessibility
82
Y Combinator-backed API-first B2B data platform (40M+ companies, 850M+ people) with agent-native docs, Node and Python SDKs and three MCP servers, but a $300/month minimum, a card-required trial and thin public track record.
Documentation & DX
80
Reliability
60
Ecosystem & SDKs
74
Accessibility
62
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
Sales-prospecting platform with a modern async public API, OpenAPI specs and a 57-tool MCP server, but API-plan eligibility is unclear in public sources and Pro/Enterprise pricing is sales-led.
Documentation & DX
76
Reliability
74
Ecosystem & SDKs
68
Accessibility
50
Contact-lookup platform with a documented REST API, status page and MCP server, but API access is gated to top-tier or custom plans and the product carries heavy data-accuracy and billing complaints.
Documentation & DX
76
Reliability
74
Ecosystem & SDKs
66
Accessibility
50
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
EMEA-focused sales-intelligence platform with a well-structured OAuth 2.0 API and MCP server, but API access requires an enterprise-style subscription entitlement and there is no public free tier or price list.
Documentation & DX
72
Reliability
66
Ecosystem & SDKs
62
Accessibility
32
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
Contact-data API with a public reference (endpoints, auth, per-endpoint rate limits, webhooks) but API access is sales-gated to a custom Team/API plan, and an unusually high outage count and Trustpilot privacy complaints weigh on it.
Documentation & DX
70
Reliability
58
Ecosystem & SDKs
50
Accessibility
35
How this category is scored
Each provider is evaluated against the same four criteria and scored from 0 to 100. Every figure links to a primary source. Latency and observed-uptime probes are reserved for a future phase. Corrections: corrections@apibenchmarks.com Every provider in Data Enrichment APIs is scored on the same four criteria: documentation & dx (30%), reliability (25%), ecosystem & sdks (25%), accessibility (20%). Price is reported separately because price units are not comparable. Full methodology →
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, Bright Data, Apollo.io, Hunter, Explorium, Lusha, FullEnrich, Prospeo, FullContact, Seamless.AI, RocketReach, Clay, ContactOut 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 Bright DataCrustdata vs Apollo.ioPeople Data Labs vs Bright DataPeople Data Labs vs Apollo.ioBright Data vs Apollo.io
References
175 primary sources · show all
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