Lead Enrichment APIs for AI Agents
Stop working with bad data. These enrichment APIs let your agent pull verified emails, company info, and intent signals in real time, so every lead is worth reaching.
What Are Enrichment APIs?
An enrichment API takes a small piece of data you already have — like an email address or a company domain — and returns a full profile: job title, company size, tech stack, funding history, and verified phone numbers. Instead of your reps spending 10 minutes researching each lead on LinkedIn, your AI agent does it in under a second.
Enrichment vs. Prospecting
Prospecting is finding new leads you don't have yet. Enrichment is filling in the blanks on leads you already have. Most modern tools do both, but the API endpoints are different. When you're connecting to Claude or Cursor, you want the enrichment endpoints — they take an input (email, domain, LinkedIn URL) and return structured data your agent can act on.
How AI Agents Use Enrichment Data
The real power isn't just getting data — it's what your agent does with it automatically:
- Lead Scoring: Your agent checks company size, funding, and tech stack against your ICP, then tags leads as "Hot," "Warm," or "Skip."
- Personalized Outreach: Feed enriched data into your email tool so Claude can write a message mentioning the prospect's specific role, recent funding round, or tech they use.
- CRM Hygiene: Run your entire contact list through an enrichment API to fill missing fields, fix outdated job titles, and flag people who've changed companies.
- Waterfall Strategy: If Apollo doesn't have a phone number, your script automatically tries Proxycurl, then People Data Labs. You chain providers until you get the data.
Top Enrichment APIs Compared (2026)
These are the best "Lego blocks" for plugging enrichment into your AI agent stack:
| API Provider | Best For | Key Differentiator |
|---|---|---|
| Apollo.io | All-in-one prospecting + enrichment | 700M+ contacts with built-in AI scoring. Free tier available. |
| Proxycurl | LinkedIn profile enrichment | Pulls structured data from LinkedIn profiles via API. Great for AI agents. |
| People Data Labs | Bulk enrichment at scale | 1.5B+ person records. Pay-per-record pricing ideal for waterfall setups. |
| UpLead | Verified contact data | 95% email accuracy guarantee. Real-time verification on every lookup. |
| FullEnrich | Waterfall enrichment | Aggregates 15+ data providers in one API call. Built for the waterfall approach. |
| ZoomInfo | Enterprise-grade accuracy | The gold standard for large sales teams. Deep firmographic and intent data. |
Claude Code Workflow: Enrich a Lead List
You don't need to write code from scratch. Here's the 3-step approach:
- Pick your provider: Grab the API docs link for your enrichment tool (e.g., Proxycurl's API reference).
- Feed it to Claude: Paste the docs URL and your CSV of leads into Claude Code or Cursor.
- The Prompt: "Claude, here are the Proxycurl API docs. Write a script that takes my CSV of LinkedIn URLs, enriches each one with job title, company name, and employee count, and saves the results to a new CSV. Add a 1-second delay between requests to respect rate limits."
MCP Configuration (for tools that support it)
Some enrichment providers have MCP servers, which means Claude can call them directly without you writing any code. Check each tool's page in our directory for the ⚡ MCP Ready badge and copy-paste config.
FAQ
Q: What's a "waterfall" enrichment strategy?
A: It means chaining multiple data providers. If Provider A doesn't have the email, your script tries Provider B, then C. Tools like FullEnrich do this automatically in a single API call.
Q: How much does enrichment cost?
A: Most providers charge per record — anywhere from $0.01 to $0.50 per lookup depending on the data depth. Apollo has a generous free tier. People Data Labs offers pay-as-you-go pricing.
Q: Is it legal to use enrichment APIs?
A: Yes. Reputable providers source data from public records, business filings, and opt-in directories. For GDPR-sensitive markets (Europe), check that the provider has compliance certifications.
Conclusion
Enrichment APIs are the foundation of any AI-powered sales stack. They turn incomplete contact lists into actionable intelligence your agents can use to score, personalize, and close. Explore our Sales Intelligence category to find the right data provider for your workflow.
Technical Comparison
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