MCP servers for B2B prospecting: 37 vendors checked (2026)
2026-11-09 · 9 min read · Adam Axelsson, founder of Revexa
Most large B2B data and sales tools now run an official MCP server, so Claude, ChatGPT, Cursor or your own agent can search companies and people, enrich contacts and read buying signals from a chat. Of the 37 vendors we checked, 35 have or had one. Twenty are listed in Claude's connector directory, among them Apollo, ZoomInfo, Clay, Lusha, Crustdata, Crunchbase, Leadfeeder and Seamless. A handful can also send: Apollo, Hunter, Instantly, lemlist, Smartlead and Seamless send email or start sequences, and Gojiberry sends LinkedIn messages. Vibe Prospecting, one of the first prospecting connectors in Claude, shuts down on 2 December 2026.
Updated 9 November 2026. Every row below is checked against the vendor's own documentation, help center or listing on that day, with the source linked. Revexa runs a free MCP server for company-level buying signals and builds Leo, so we are not neutral; Revexa sits in the signals group below, in alphabetical order.
What an MCP server does for prospecting
The Model Context Protocol (MCP) is an open standard that lets an AI assistant call outside tools. Connect a prospecting server, and the assistant can do things it can't do on its own:
- look up which companies are hiring or raised money this week;
- find the right people at those companies;
- verify an email address;
- in some cases, start a sequence or send a message.
The server decides what the assistant may do. Most are read-only or only write to your own CRM or lists. A few can send, and those are the ones to set up with care.
Contact and company data
Search and enrich companies and people. None of these send messages.
| Tool | Finds companies | Finds people | Signals | In Claude's directory | Cost to use | Source |
|---|---|---|---|---|---|---|
| Clay | Yes | Yes | Research: funding, hiring trends, tech stack, executive changes | Yes | 500 free credits on first connect, then plan credits; drafts only, sending needs a custom Function | Clay |
| Cognism | Yes | Yes | Intent topics, event filters | No (custom connector) | Standard or Pro plans; 1 credit per revealed contact | Cognism |
| Coresignal | Yes | Yes | Funding and job data as filters | No | Credits per call (search 20, email 10) | Coresignal |
| Crustdata | Yes | Yes | Job postings, headcount, funding, web traffic, LinkedIn posts | Yes | Credits per call | Crustdata |
| Findymail | Yes | Yes | No | No | "API & MCP access" on all plans; 10 free credits | Findymail |
| Lusha | Yes | Yes | 26 dated signal types, including funding, hiring surges and job changes | Yes | Same credits as the API; "does not send messages or add anyone to sequences" | Lusha |
| Prospeo | Yes | Yes | No | No | 1 credit per search page or email | Prospeo |
| ZoomInfo | Yes | Yes | Intent, scoops, funding, hiring, executive and job changes | Yes | ZoomInfo license; search free, enrichment uses credits | ZoomInfo |
People Data Labs has no official MCP server that we could find.
Buying signals and intent
Tell you which companies have a reason to talk now.
| Tool | What it watches | In Claude's directory | Cost to use | Source |
|---|---|---|---|---|
| 6sense | Keyword intent, buying stage, website visits | The vendor says yes (beta enrollment) | Revenue Marketing license | 6sense |
| BuiltWith | Technology added and removed | No | API credits; guest lookups or plans from $295 | BuiltWith |
| Common Room | Website visits, job changes, intent, product usage | Yes | Included in all plans, from $2,500 a month billed yearly | Common Room |
| Crunchbase | Funding rounds, acquisitions and predictions | Yes | All accounts can connect; data tokens per field | Crunchbase |
| Demandbase | Account intent, buying groups, engagement | The vendor says yes | Enabled through your account team; 1 credit per record | Demandbase |
| Harmonic | Funding, net-new companies from saved searches | Yes | 100 requests a day at no cost with a Harmonic account | Harmonic |
| Leadfeeder (Dealfront) | Website visits and ICP fit | Yes | Paid plans with API access | Leadfeeder |
| Revexa (ours) | Swedish companies hiring B2B salespeople, startups hiring sales, the week's B2B funding rounds | No (custom connector) | Free, no account or key | Revexa |
| TheirStack | Hiring from job posts, technographics | The vendor says yes | API credits, plans from $49 a month | TheirStack |
Sending and sequences
These can act. Check how each one asks before it sends.
| Tool | What it can do | Finds leads | In Claude's directory | Source |
|---|---|---|---|---|
| Amplemarket | Launches sequences ("starts sending") and enrolls leads | Yes | No | Amplemarket |
| Apollo | Sends one-off emails, adds contacts to sequences; also finds leads by hiring and funding signals | Yes | Yes | Apollo |
| Gojiberry | Sends LinkedIn messages, activates campaigns, reads intent signals | Yes | No | Gojiberry |
| Hunter | Start-Sequence "begins sending real emails"; finds emails and companies, funding and hiring signals | Yes | No | Hunter |
| Instantly | Creates and activates campaigns, adds leads, replies | Not confirmed | No | Instantly |
| lemlist | Starts campaigns, sends messages and replies, LinkedIn steps; searches a B2B database | Yes | No | lemlist |
| Outreach | Creates sequences and enrolls prospects; no direct send tool | Own data only | Yes | Outreach |
| Seamless.AI | Sends email and bulk email with confirmation (Connect license); job-change signals | Yes | Yes | Seamless |
| Smartlead | Sends email "only after you confirm" | Not confirmed | The vendor says yes | Smartlead |
| Unify | Approving an enrollment starts sending; finds companies and people through its agent | Yes | Yes | Unify |
Salesloft's listing shows only search tools, and we could not verify sending for Salesforce's beta server.
CRMs and web research
- CRMs:
- HubSpot, Salesforce (beta), Attio and Pipedrive have official servers that read and write your own CRM records.
- They don't find new companies.
- HubSpot says its Claude connector needs a paid Claude plan.
- Web research:
- Exa searches the web for companies and people, with a free tier.
- Apify runs thousands of scrapers.
- Bright Data scrapes and searches, with 5,000 free requests a month.
- None of the three has dedicated signal tools, and none sends.
Closed and closing
- Vibe Prospecting (Explorium) is available until 2 December 2026. Its MCP server, its app and Explorium's API (AgentSource) close with it. Unused credits are refunded within 30 days, and data is deleted by 31 December. See Vibe Prospecting alternative.
- Trigify closed on 22 October 2026 after HubSpot hired the team, and its MCP server went with it. See Trigify alternatives.
How to choose
- To build lists with emails and phone numbers: Apollo, ZoomInfo, Lusha or Crustdata. They are all in Claude's directory and sell on credits.
- To know who to call this week:
- Crunchbase or Harmonic for funding;
- TheirStack for hiring and tech;
- Leadfeeder for website visits;
- Common Room, 6sense or Demandbase if you already pay for them.
- To send from the chat: Apollo, Hunter, lemlist, Instantly, Smartlead or Seamless. Turn on every confirmation the tool offers, and test on your own address first.
- To start for free:
- Hunter's free plan (50 credits a month);
- Harmonic's 100 daily requests;
- Exa's free tier;
- Bright Data's 5,000 requests;
- Revexa's signal server.
- To have an agent do the whole job: Gojiberry runs signals, messages and campaigns from the chat. Leo by Revexa, ours, does the same in its own app, iMessage and Slack, and asks for your approval before anything is sent; Revexa's MCP server covers only the signals.
Setting one up
- Claude:
- Customize → Connectors → + Add → Add custom connector, then enter the server URL.
- Custom connectors work on every plan, and the Free plan allows one.
- On Team and Enterprise, an Owner adds them under Organization settings → Connectors.
- A tool call may take up to 240 seconds.
- Source: Claude help, checked 9 November 2026.
- ChatGPT:
- Go to chatgpt.com/plugins, select +, then Add custom MCP server, and finish with Create as a plugin.
- Your plan and workspace settings decide whether custom servers are allowed.
- Source: OpenAI.
- Claude Code:
claude mcp add --transport http <name> <url>, then/mcpto sign in. - Cursor:
.cursor/mcp.jsonwith{ "mcpServers": { "<name>": { "url": "<url>" } } }.
Directory connectors connect in one click. Everything else is added by URL, and some servers need an API key in a request header.
Frequently asked questions
What is the best MCP server for B2B prospecting?
It depends on the job:
- Contact data in Claude's directory: Apollo, ZoomInfo and Lusha.
- Buying signals: Crunchbase, Harmonic, TheirStack and Leadfeeder.
- Sending from the chat: Apollo, lemlist, Instantly, Smartlead and Seamless.
All were checked on 9 November 2026.
Which prospecting MCP servers can send emails or LinkedIn messages?
Email:
- Apollo (one-off emails and sequences);
- Hunter (sequences);
- Instantly and lemlist (campaigns and replies);
- Smartlead (after you confirm);
- Seamless (with its Connect license).
LinkedIn messages: Gojiberry.
Sequences: Amplemarket and Unify launch sequences that send.
Is there a free MCP server for B2B leads?
Several have free tiers:
- Hunter (50 credits a month);
- Harmonic (100 requests a day with an account);
- Exa (free tier);
- Bright Data (5,000 requests a month).
Revexa's server is free with no account. It returns Swedish companies hiring B2B salespeople, startups hiring sales and the week's B2B funding rounds, at company level.
What replaces Vibe Prospecting in Claude?
For contact data in Claude's directory, Apollo, ZoomInfo, Lusha, Crustdata and Clay are the closest. For buying signals, Crunchbase, Harmonic and Leadfeeder. If you used Vibe to build lists that you then contacted, an agent that finds the buyer and writes to them may save the export step. See Vibe Prospecting alternative.
Which ChatGPT plans can add custom MCP servers?
OpenAI's documentation says account and workspace policies decide it. Check your workspace settings, and in Business or Enterprise, ask your admin.