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Fastn is an embedded integration platform for B2B software companies. Your customers connect their own apps inside your product, and Fastn's MCP Gateway lets AI agents call those same integrations as tools.
Checked against: Fastn's MCP Gateway page on 28 October 2026. eSEOspace did not test Fastn's products.
Key Takeaways
- Fastn says one integration works three ways: in its embedded widget, through one API and as an MCP tool.
- Its MCP Gateway gives agents "a single MCP connection" to each customer's connected tools.
- Each call runs "under one customer's credentials with scoped permissions," per Fastn.
- The Launch plan is $0 with three customer connections; Scale is $500 a month.
- Fastn says it is SOC 2 Type II certified and GDPR compliant.
At a glance
| Item | Details |
|---|---|
| Company | Fastn (fastn, Inc.) |
| What it offers for MCP | MCP Gateway over its embedded integrations, unified API and workflows |
| Who it's for | B2B SaaS companies that add customer integrations and AI agents |
| Open source? | Not stated on the pages we checked |
| Pricing | Launch $0; Scale $500/mo; Enterprise volume pricing |
What Fastn offers for MCP
The integration layer
Fastn's home page calls it "the integration layer for SaaS." You embed a widget once, and your customers connect apps like Salesforce, HubSpot or NetSuite. Fastn handles authentication, mapping, retries and monitoring.
The home page says each integration can be used "three ways." Customers use it in the widget, and your product calls it through one API. Your agents call it as a tool "from Claude, Cursor or any MCP client."
The MCP Gateway
The MCP Gateway page describes "the governed MCP endpoint for enterprise tools." Fastn lists three properties:
- One endpoint. Agents discover CRM, ticketing, finance and HR actions "through a single MCP connection, no per-tool code."
- Scoped access. Every call runs under one customer's credentials, so "blast radius stays contained."
- Logged actions. Every agent action is "logged and attributable."
Setup has three steps on the page. Add the Fastn MCP endpoint to Claude, Cursor or your own agent. Grant the tools and permissions each tenant allows. Then watch calls in the dashboard. Fastn says it manages tokens and refresh for you.
Agents that maintain integrations
Fastn also describes "integration agents." A builder agent helps create and test integrations. On Enterprise, a maintainer agent keeps them working when an API changes. AI credits on each plan pay for the builder agent.
Who it's for
Fastn targets B2B software companies whose customers ask, "Do you support X?" It fits teams that want customer integrations and agent tools from one build. Our guide on build vs buy for MCP servers can help you weigh that against custom work.
Pricing
Fastn's pricing page charges "per customer connection, not per integration." A customer connection is "one customer signed in to one app." Plans as of October 2026:
| Plan | Price | Included |
|---|---|---|
| Launch | $0 | 3 customer connections, unlimited connectors, workflows and seats, 50 AI credits a month, email support |
| Scale | $500/mo ($6,000 billed yearly) | 10 customer connections, then $50 each; 1,000 AI credits; dashboards and alerts; private Slack channel |
| Enterprise | Volume pricing | Custom capacity, bring your own model, maintainer agent, white-label embed, SSO/SAML, data residency, SLA |
The comparison table lists MCP client use ("Claude, Cursor or any MCP client") on every plan. API rate limits are 100 requests per minute on Launch and 500 on Scale.
Security and trust
Fastn's security page lists "SOC 2 Type II Certified," "ISO-Certified," "GDPR Compliant" and "HIPAA- and PCI-Ready." The ISO line does not name a standard, so ask which one.
The same page says "every credential is tenant-scoped and encrypted." It says every agent action is "permission-checked, logged, and reversible." RBAC, private networking and self-hosting are listed for Enterprise. Our MCP security risks guide covers what to verify.
Alternatives
- Nango offers MCP auth and per-tenant agent sessions with usage-based pricing.
- Merge sells Agent Handler, managed connectors with DLP on tool calls.
- Cequence converts APIs into MCP tools inside a security-focused AI gateway.
Browse more MCP company spotlights.
Next step
Count how many customers would connect how many apps in year one. That number drives Fastn's price and most competitors'. If you need a custom server instead, talk to our MCP development team.
Frequently asked questions
How does Fastn expose integrations over MCP?
Its MCP Gateway gives agents one MCP endpoint. Each connected tool appears as a callable action, scoped to one customer's credentials.
What does Fastn charge?
Launch is free with three customer connections. Scale is $500 a month with ten connections, then $50 per extra connection. Enterprise uses volume pricing.
Is MCP access limited by plan?
Fastn's comparison table lists Claude, Cursor or any MCP client on every plan, described as "unlimited" on Launch.
Can I self-host Fastn?
Fastn's security page lists self-hosting among Enterprise options, alongside RBAC and private networking.
