Apollo.io vs x402 Email Verifier
Apollo.io is a plugin bundle for AI coding tools published by Apollo.io. Marketplaces we read that list it: 1 (Claude: knowledge-work-plugins). x402 Email Verifier is an MCP server published by x402-email-verifier.microtools-x402.workers.dev. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-27. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  Apollo.io | |
|---|---|---|
| Claude: knowledge-work-plugins | Listed Version: 0.1.0 Forks (GitHub): 3 654 Stars (GitHub): 33 175 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.1.2 Forks (GitHub): 0 Stars (GitHub): 0 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Apollo.io | x402 Email Verifier |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 33 175 (better) | 0 (worse) |
| Forks (GitHub) (differs) | 3 654 (better) | 0 (worse) |
| Last release (differs) | Not published | 2026-10-20 |
| Where it runs (differs) | Remote server (mcp.apollo.io/mcp) | Remote server (x402-email-verifier.microtools-x402.workers.dev/mcp) |
| Transport | Streamable HTTP | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 4 | Not a bundle |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/anthropics/knowledge-work-plugins | Not stated |
| Changes in the last 7 days (differs) | 0 | 2 |
| First seen (differs) | 2026-10-11 | 2026-10-17 |
| Endpoint at the last check (differs) | Responded 24 h ago | Responded 3 days ago |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Apollo.io
Prospect, enrich leads, and load outreach sequences with Apollo.io — one-click MCP server integration for Claude Code and Cowork.
x402 Email Verifier
Email verification for AI agents: syntax, MX, disposable, role, score. $0.001 USDC/call via x402.
How to run each
Apollo.io As a Claude Code plugin
/plugin marketplace add anthropics/knowledge-work-plugins
/plugin install apollo@knowledge-work-pluginsx402 Email Verifier As a remote MCP server
claude mcp add --transport http email-verifier https://x402-email-verifier.microtools-x402.workers.dev/mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Both endpoints responded at the last daily check. How we check endpoints
Tools each declares
Neither the marketplaces of Apollo.io nor its endpoint list any tools, so we do not compare tools.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: Apollo.io · What it can do: x402 Email Verifier · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/knowledge-work-plugins/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.