Your product already covers the common integrations. Fastn covers the rest: the bespoke, one-off connectors and workflows that pre-built catalogs cannot handle and that cost you up to 30% of the customers you lose. It is the wildcard connector your customers configure themselves, inside your product, so "we do not support that yet" turns into "yes."
Fastn is an embedded integration platform for SaaS products and AI agents.
Website · Integrations · Docs · MCP Server · Python SDK
- Win the deals you lose to "we don't support that." Every bespoke integration request becomes a yes your customer configures, so your market stops being capped by your connector catalog.
- Cut integration-driven churn. Integrated customers churn ~58% less on average, and 70-79% less in mid-market (Crossbeam, 2023).
- Go live in days, not weeks. Configured by the customer in days, versus weeks of engineering per connector.
- Reclaim engineering capacity. Connector build and maintenance time approaches zero.
| Dimension | AI coding agents (e.g., Claude Code) | iPaaS (Merge, Paragon, Workato) | In-house | Fastn |
|---|---|---|---|---|
| Who does the work | Your engineers, AI-assisted | Your engineers build the flows | Your engineers | Your customer, inside your product |
| Bespoke custom objects & logic | Yes, but re-generated per customer | Breaks on custom and bespoke logic | Yes, one-off per customer | Yes, customer-configured |
| Production hardening (auth refresh, retries, rate limits, idempotency, observability) | AI writes the happy path; you engineer each concern per connector | Partial; per-customer logic still on you | You build all of it | Built in at the platform level |
| Multi-tenant runtime & isolation | You build it | Usually not your brand | You build it | Native: per-tenant auth, data, permissions |
| Maintenance when an API changes | You regenerate, review, redeploy | Your engineers fix it | Your engineers fix it | Monitoring agent plus AI testing agents keep it working |
| Embedded in your product | Whatever you wire around it | Their widget | Yes, you build the embed | Yes, white-label |
| AI-native (build and maintain) | Drafting only | No | No | Yes, end to end |
| Time to a customer's integration | Hours to draft, weeks to harden | Weeks of engineering | Weeks per customer | Days, customer-driven |
| Cost as you scale | Engineering time per connector | Expensive at scale | Hits the backlog wall | Pay only for active customers |
Your customer authorizes their own Salesforce, NetSuite, or ServiceNow, including custom objects, custom tables, and bespoke logic, and describes what the data and workflows should do. Fastn configures authentication, data mapping, business logic, retries, idempotency, rate limits, and observability automatically. The customer configures the integration, not your engineering team.
CRM and ERP are where integrations get hardest, and where pre-built catalogs and generated code break. Every customer's Salesforce or HubSpot has different custom objects and fields; every NetSuite has its own multi-entity GL and custom records; every ServiceNow has bespoke tables and event rules. Fastn supports the 70+ CRMs your product needs, plus the ERPs and systems of record like NetSuite and ServiceNow, and handles that customization natively: your customer maps their own objects, fields, and logic, and the platform keeps it running as their setup changes, without a one-off build per customer.
Beyond CRM and ERP, Fastn connects across 1000+ tools, and products serving sales, marketing, customer success, and support teams benefit immediately, because their customers expect them to plug into whatever stack they already run.
The integrations don't become your maintenance burden. The platform runs them:
- Monitoring agent on every production integration: continuous health, with issues surfaced before your customers notice.
- AI that builds and maintains: connector builder, workflow builder, and testing agents create and keep connectors working, including when upstream APIs change.
- Unlimited connectors & workflows: custom objects, custom tables, bespoke and custom connectors included.
- Free sandboxes: unlimited test environments; test traffic never bills.
- White-label embed: your brand; your customers never see Fastn.
- Enterprise-ready: SOC 2 Type II, 99.9% uptime SLA, multi-tenant governance and audit, named solutions engineer.
For products with AI agents, Fastn exposes the same integrations as a governed MCP gateway, built multi-tenant from the ground up:
- One MCP endpoint, every customer isolated. Pass a tenant identifier and each customer's agents see only that customer's authorized tools, data, and systems, without writing separate code per customer.
- Governed tool access. Agents act inside customer systems within their permissions, with RBAC, audit trails, and data masking on every call.
- Built on the same connectors. Agents reach each customer's Salesforce, NetSuite, ServiceNow, and custom systems through the integrations already configured in your product.
- One capability of the platform: the agent surface on top of the integration platform, not a separate product.
SaaS products and AI agents that connect to their customers' systems of record, and whose bespoke integration requests are capping their market or driving churn.
| Repo | What it is |
|---|---|
| fastn-mcp | Fastn MCP server: connect AI agents to your tools |
| fastn-sdk | Python SDK for the Fastn platform |
| docs | Fastn product documentation |
What is Fastn? An embedded integration platform for SaaS products and AI agents. It covers the bespoke, one-off integrations and workflows your pre-built catalog cannot, configured by the customer inside your product.
Who maintains the integrations? Fastn does. A monitoring agent watches every production integration, and AI testing agents keep connectors working as upstream APIs change, with no per-customer maintenance on your team.
How fast can a customer integration go live? Days, configured by the customer, versus weeks of engineering per connector.
How does the multi-tenant MCP gateway work? One MCP endpoint serves all your customers; each tenant is isolated, and an agent only accesses the tools and systems that customer authorized, with full audit and data masking.
How does Fastn affect churn? Integrated customers churn ~58% less on average, and 70-79% less in mid-market (Crossbeam, 2023).
What can Fastn connect to? Customer systems of record such as Salesforce, NetSuite, and ServiceNow, including custom objects, custom tables, and bespoke logic, plus 1000+ tools across the rest of your customers' stack.