Issue #1: 32 MCP listings across 27 GTM tools, checked

Published: 2026-10-15 · StackMCP Issue #1 (web archive)

Week zero: the baseline

StackMCP (https://mcpforgtm.com) tracks which go-to-market tools have official MCP servers: the endpoint, the auth model, and what your agent can actually call.

Nothing broke yet, because this is the first issue. Instead, here's the starting line. On 2026-10-15 we checked 32 MCP listings across 27 GTM tools against vendor docs. Starting next week, each issue leads with outages, auth changes, and removed tools.

• Browse the matrix: https://mcpforgtm.com/
• Changelog: https://mcpforgtm.com/changelog.html

By the numbers

• 32 listings across 27 tools, checked against vendor docs
• 27 remote MCP endpoints
• 5 local or discovery-only (stdio or non-HTTP)
• 26 listings that mention OAuth, sometimes alongside API keys

Four things to know before you wire one up

1. Don't assume one auth pattern. Instantly is API-key-first. Clay and Attio use OAuth, and Apollo uses OAuth with a master API key option for headless use.
2. Remote and local servers aren't interchangeable. ZeroBounce and some packages are stdio-only, so they won't work in a Claude custom connector URL field.
3. A directory listing isn't proof. We label a listing "Docs + endpoint checked" only when vendor docs and a live auth challenge back it up; docs-only listings are labeled "Docs checked". PredictLeads, for example, is listed with a hosted-MCP claim, but we haven't confirmed the endpoint yet, so don't rely on a connector URL for it.
4. A ChatGPT or Claude connector isn't the same as an MCP URL. Some vendors ship directory connectors and raw Streamable HTTP endpoints. Use the vendor docs link on each StackMCP tool page.

Verified remote endpoints

18 of the 27 remote endpoints, in no particular order. The full list, including regional and local variants, is at https://mcpforgtm.com/.

Prospecting and enrichment

• Apollo: https://mcp.apollo.io/mcp

Auth: OAuth 2.0 (master API key / X-Api-Key for headless) Docs: https://docs.apollo.io/docs/apollo-mcp

• Clay: https://api.clay.com/v3/mcp

Auth: OAuth 2.0 with DCR + PKCE Docs: https://university.clay.com/docs/connect-to-clay-mcp

• Lusha: https://mcp.lusha.com

Auth: OAuth or x-api-key header Docs: https://docs.lusha.com/user-guide/mcp/lusha-model-context-protocol-mcp-server

• Wiza: https://mcp.wiza.co/mcp

Auth: OAuth 2.1 + PKCE or Bearer API key Docs: https://mcp.wiza.co/usage.html

• Prospeo: https://mcp.prospeo.io

Auth: OAuth 2.0 or API key Docs: https://prospeo.io/api-docs/mcp

• LeadMagic: https://mcp.leadmagic.io/mcp

Auth: OAuth Docs: https://leadmagic.io/solutions/mcp

• PhantomBuster: https://mcp.phantombuster.com

Auth: OAuth Docs: https://hub.phantombuster.com/docs/mcp-server

• Crunchbase: https://mcp.crunchbase.com

Auth: OAuth 2.1 with PKCE (CIMD; DCR not supported) Docs: https://data.crunchbase.com/docs/connecting-ai-tools

Outreach, CRM, and scheduling

• Instantly: https://mcp.instantly.ai/mcp

Auth: API key (Authorization header or URL path) Docs: https://help.instantly.ai/en/articles/12980002-instantly-mcp-model-context-protocol

• HubSpot: https://mcp.hubspot.com

Auth: OAuth 2.1 with PKCE (MCP connector) Docs: https://developers.hubspot.com/docs/apps/developer-platform/build-apps/integrate-with-the-remote-hubspot-mcp-server

• Attio: https://mcp.attio.com/mcp

Auth: OAuth Docs: https://docs.attio.com/mcp/overview

• Calendly: https://mcp.calendly.com

Auth: OAuth 2.1 + PKCE with Dynamic Client Registration Docs: https://developer.calendly.com/docs/mcp/calendly-mcp-server

Workflow, data, and content

• Zapier: https://mcp.zapier.com/api/v1/connect

Auth: OAuth (listed clients) or connection token Docs: https://docs.zapier.com/mcp/home

• Notion: https://mcp.notion.com/mcp

Auth: OAuth (MCP tokens on Business/Enterprise) Docs: https://developers.notion.com/guides/mcp/get-started-with-mcp

• Airtable: https://mcp.airtable.com/mcp

Auth: OAuth (DCR) or Personal Access Token Docs: https://airtable.com/developers/agents/mcp/getting-started

• Slack: https://mcp.slack.com/mcp

Auth: Confidential OAuth (registered Slack app) Docs: https://docs.slack.dev/ai/slack-mcp-server

• Webflow: https://mcp.webflow.com/mcp

Auth: OAuth Docs: https://developers.webflow.com/mcp/reference/overview

• Typeform: https://api.typeform.com/mcp

Auth: OAuth (CIMD; no PATs) Docs: https://help.typeform.com/hc/en-us/articles/50533862636308-Connect-Typeform-to-your-AI-with-the-Typeform-MCP-server

What we'll flag starting next week

• Endpoints that stop returning auth challenges
• Changes to OAuth or DCR behavior
• Tools removed from a vendor's MCP server

Want to see what's down right now? Endpoint checks run daily on the status page.

Vendors: get your MCP server verified at https://mcpforgtm.com/get-verified.html

Know someone wiring agents into a sales stack? Send them https://mcpforgtm.com/newsletter.html

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