Best enrichment tools for Claude Code & AI agents

Pricing and access details checked October 2026.

TL;DR

The best enrichment tool for AI agents is the one an agent can actually call, at a price that survives autonomous volume. Quick version:

• If you want MCP-native, flat-rate enrichment for Claude Code, use MoltSets. Agents call it directly through MCP or its API. There's no dashboard and no per-record credits on email and search, and plans start at $27/mo.

• If you want one agent to find contacts and enroll them in email sequences, use Apollo. It combines its contact database with built-in outreach, and its MCP server is available on all plans at no extra cost.

• If you want enterprise-grade company data and intent without an annual contract, use ZoomInfo GTM.AI. It sells pay-as-you-go credits, and search is free.

• If you want low-cost verified emails and mobiles with a hosted MCP server, use Prospeo. No charge when nothing is found.

• If you want company signals and events for account research agents, use Explorium. It includes an estimate-cost tool so agents can check spend before calling.

• If you want a deep waterfall for contact finding and your agent can wait, use FullEnrich. It searches 25+ sources, but asynchronously.

• If you only need email finding and verification, use Hunter. MCP is included on every plan.

• If you want the widest raw person dataset and your team can write code against an API, use People Data Labs. There's no official MCP server, so Claude can't plug into it directly. It's accessed through scripts.

How much will enrichment cost your agent?

Enter how many contacts your agent enriches with a verified email each month to see the cheapest plan on each tool that covers it.

Credit Burn Calculator

For example, an agent enriching 20,000 contacts a month with verified emails costs about:

• MoltSets: $27

• Hunter: $299

• Prospeo: $339

• Apollo: $99 plus 16,000 add-on credits (Apollo doesn't publish the add-on price)

• FullEnrich: $1,150

• ZoomInfo GTM.AI: $6,400

That's based on monthly list prices checked October 2026.

What makes an enrichment tool agent-ready

An enrichment tool is agent-ready when an AI agent can call it, read the result and control its own spend without a human in the loop. In 2026, most major providers ship an MCP server, so access alone no longer separates them. These four criteria do:

• Programmatic access (MCP or API, not dashboard-only). The agent needs a hosted MCP server, an API, or both. Dashboard-only and browser-extension tools fail this test outright.

• Pricing that survives autonomous call volume. Agents retry, loop and fan out. Per-credit pricing with monthly caps, expiring credits or daily request ceilings turns that into failed runs or surprise bills. Flat-rate pricing removes the ceiling.

• A consistent request and response shape. Synchronous responses, explicit "not found" statuses and standard 429 errors with a retry time let an agent recover on its own. Webhook-only or poll-only results are hard for a local Claude Code session to use.

• Free account and usage endpoints. An agent should be able to check its own balance, rate limit and usage without spending credits to do it.

Best enrichment tools for Claude Code & AI agents compared

What's the best enrichment tool for Claude Code?

MoltSets. It's a contact data search and enrichment API built for AI agents, with no dashboard to log into. Claude Code connects to its hosted MCP server at https://mcp.moltsets.com/mcp with OAuth, and scripts and backends can call the same tools through its API.

Works in Claude Code: Yes, via hosted MCP (OAuth), with a documented setup command.

Best for: Developers and GTM engineers running enrichment from Claude Code, claude.ai, Cursor, ChatGPT or Clay, especially agents that enrich in loops or at volume.

Pricing:

• Free plan with 1,000 lifetime enrichment records.

• Paid plans are $27, $97, $397 and $997/mo, with no seats, contracts or per-record credits on email and search.

• Usage is bounded by rate limits (5,000 enrichment requests per five hours on the $27 plan) and a fair-use policy.

• Mobile numbers use phone tokens at $0.15 each, sold as an add-on to paid plans.

• Misses don't consume records, and get_account, get_billing and get_usage never consume credits, so an agent can monitor its own spend.

What it returns:

• Verified business and personal emails, each with an A–F risk score and a last_validated_at date.

• Carrier-verified mobile numbers.

• People and company search.

• Reverse email and LinkedIn lookups.

• Hashed emails and MAIDs for ad audiences.

Limitations: MoltSets is a data layer, not a full sales platform. There's no dialer, sequencer, or CRM.

Verdict: Use MoltSets if an agent is doing the enriching and you want a predictable monthly bill. Don't use it if you want a full sales platform with sequencing and dialing built in.

What's the best enrichment tool for agents that also run outreach?

Apollo. Its hosted MCP server at https://mcp.apollo.io/mcp gives agents in Claude Code, Claude Desktop, ChatGPT, Cursor and Codex access to Apollo's contact database plus its sequencing and CRM tools.

Works in Claude Code: Yes, via hosted MCP (OAuth).

Best for: Teams that want one agent to find contacts, enrich them and enroll them in sequences without switching tools.

Pricing:

• Free plan available. Basic is $49/seat/mo billed annually, or $65 billed monthly, with 2,500 credits/mo on monthly billing.

• An email costs 1 credit and a phone number costs 8. People search through MCP is free.

• Unused credits expire at the end of each billing cycle.

• API enrichment is capped at 2,000 calls/day on Basic and Professional.

Limitations: Phone reveals are asynchronous. They require a webhook URL or polling by request ID, so an agent doesn't get mobile numbers in the same response.

Verdict: Use Apollo if you want data and outreach in one MCP server. Don't use it if your agent runs high-volume enrichment, where expiring credits and daily caps will bite.

What's the best enrichment tool for enterprise data and intent?

ZoomInfo GTM.AI. GTM.AI is ZoomInfo's self-serve API and MCP layer. It exposes ZoomInfo company, contact and intent data through a hosted MCP server at https://mcp.zoominfo.com/mcp, with OAuth.

Works in Claude Code: Yes, via hosted MCP (OAuth).

Best for: Agents that need ZoomInfo-depth firmographics, intent and Scoops without the core platform's annual contract.

Pricing:

• 1,000 free data credits at signup.

• Data credits cost $0.45 each for the smallest purchases, falling to $0.38 from 2,500 credits and $0.25 at 100,000. Top-ups start at $20.

• Search and lookup are free. Enriching a contact or company costs 1 credit per new record, whether or not an email comes back. In ZoomInfo's own published benchmark, 535 of 764 enriched contacts (70%) returned an email.

• Credits don't expire while your account is active, and each record is charged only once per 12 months.

Limitations:

• Mobile phone data is only included in Enterprise packages, not self-serve GTM.AI.

• Enrich calls are capped at 25 records per MCP call.

• MCP access requires model training to be turned off in your AI client.

Verdict: Use ZoomInfo GTM.AI if data depth and intent matter more than cost per record. Don't use it if your agent needs mobile numbers without an Enterprise contract, or enriches thousands of contacts a week on a tight budget.

What's the best low-cost enrichment API with an MCP server?

Prospeo. Prospeo runs a hosted MCP server at https://mcp.prospeo.io (OAuth or API key), plus an npm package for local setup. It returns verified emails, mobiles and company data.

Works in Claude Code: Yes, via hosted MCP or the npm package.

Best for: Small teams and solo builders who want verified emails and mobiles at a low per-record price.

Pricing:

• Free plan with 100 credits/mo, but the API isn't included on Free.

• Starter is $49/user/mo for 2,000 credits.

• A verified email costs 1 credit and a mobile costs 10.

• No charge when nothing is found, and re-enriching the same record within 90 days is free.

• Credits expire at renewal.

Limitations: Starter caps enrichment at 2,000 requests/day and search at 1,000 requests/day, so an unattended agent loop will hit 429 errors quickly.

Verdict: Use Prospeo if per-record cost matters most and your agent runs in modest batches. Don't use it for high-volume autonomous runs on the lower tiers.

What's the best enrichment tool for company signals and events?

Explorium. Explorium's AgentSource MCP server (https://mcp.explorium.ai/mcp, API key) gives agents company and prospect search, enrichment, and business events such as funding, hiring and leadership changes.

Works in Claude Code: Not officially documented. Explorium's setup guides cover Claude Desktop and Cursor.

Best for: Account research agents that need firmographics, technographics and trigger events, not just contact details.

Pricing:

• 100-credit free trial, valid for 90 days.

• One-time credit packs from $29.99 for 500 credits, up to $7,499.99 for 500,000.

• Enrichments cost 1–5 credits. Paid credits expire 12 months after purchase.

• An estimate-cost tool lets agents preview spend before calling.

Limitations: The 200 queries/minute rate limit counts each entity in a bulk call, so enriching 50 companies in one call uses 50 of the 200.

Verdict: Use Explorium if your agent needs company signals and events. Don't use it if contact-level email and mobile enrichment is the main job.

What's the best waterfall enrichment tool for agents?

FullEnrich. FullEnrich runs a waterfall across 25+ providers for work emails, personal emails and mobiles. Agents reach it through a hosted MCP server at https://mcp.fullenrich.com/mcp, with OAuth.

Works in Claude Code: Yes, via hosted MCP (OAuth).

Best for: Batch contact-finding jobs where match rate matters more than speed.

Pricing:

• 50 free trial credits. Pro starts at $29 for 500 credits; the default tier is $55 for 1,000.

• A work email costs 1 credit, a personal email 3, and a mobile 10. Not-found results are free.

• Credits roll over for 3 months on monthly plans.

Limitations: Enrichment is asynchronous and typically takes 30–90 seconds per contact. An agent has to poll, which counts against the 60 calls/minute limit, or expose a webhook.

Verdict: Use FullEnrich for deep, batch contact finding. Don't use it when the agent needs an answer in the same step.

What's the best enrichment tool for email-only workflows?

Hunter. Hunter's hosted MCP server (https://mcp.hunter.io/mcp) exposes Domain Search, Email Finder, Email Verifier and enrichment to Claude, ChatGPT, Cursor, Gemini and Perplexity. It's included on every plan.

Works in Claude Code: Yes, via hosted MCP.

Best for: Agents whose only job is finding and verifying business email addresses.

Pricing:

• Free plan with 50 credits/mo. Starter is $49/mo for 2,000 credits.

• Each email found costs 1 credit and comes back already verified. Checking emails you already have with the Email Verifier costs 0.5 credit each.

• No charge when nothing is found.

Limitations: No phone or mobile data. Email Finder also returns a "most likely" address with a confidence score, so the agent needs its own threshold or a separate verification step.

Verdict: Use Hunter if email is the whole job. Don't use it if your agent needs mobile numbers.

What's the best enrichment API for raw person data at scale?

People Data Labs. People Data Labs (PDL) is an API-first person and company dataset with SDKs for Python, JavaScript, Ruby, Go and Rust. It has no official MCP server, so teams call its API from their own code or use unofficial community connectors.

Works in Claude Code: Only through scripts that call its API. There's no official MCP server.

Best for: Engineering teams that want broad raw records (job history, education, skills, contact fields) and can manage credits in code.

Pricing:

• Free plan with up to 100 person records/mo, but contact fields are hidden on Free.

• Pro starts at $98/mo with 350 credits.

• Enrichment costs 1 credit per successful match. Search costs 1 credit per profile returned.

Limitations: A single Person Search call can return up to 100 records and bill for each. One loose agent query can use roughly 29% of the entry Pro plan's monthly credits.

Verdict: Use PDL if you want the widest raw dataset and your team can write code to call it, including limits on search size. Don't use it if you want Claude to plug in directly through MCP.

Why per-credit pricing matters for AI agents

Per-credit pricing matters because agents don't stop at a budget line. They retry failed calls, re-run searches and fan out across lists, and every call can draw on a finite credit pool. When credits run out mid-run, the agent fails. When credits are topped up automatically, the bill grows without anyone noticing.

Take an agent that enriches 20,000 contacts a month with verified emails:

• MoltSets: fits within the $27/mo plan, which allows 5,000 enrichment records per week.

• Hunter: needs the Scale plan at $299/mo (25,000 credits).

• Prospeo: $339/mo, the Pro plan (15,000 credits) plus a 5,000-credit add-on.

Mobile numbers are metered on almost every platform, MoltSets included, because real-time carrier verification has a per-unit cost.

Which tool fits your agent workflow

• If you're building in Claude Code and want MCP-native, flat-rate enrichment, use MoltSets.

• If you want one agent to find contacts and run outbound sequences, use Apollo.

• If you need enterprise firmographics and intent without an annual contract, use ZoomInfo GTM.AI.

• If you want the lowest per-record price for verified emails and mobiles in modest batches, use Prospeo.

• If your agent researches accounts and needs funding, hiring and other events, use Explorium.

• If you run batch contact finding and can wait for async results, use FullEnrich.

• If you only need email finding and verification, use Hunter.

• If you want the widest raw dataset via API and can manage credits in code, use People Data Labs.

Frequently asked questions