fastn
The integration layer for SaaS.
fastn is an embedded integration platform for B2B SaaS products. It lets a product team embed a connect interface once, so their customers can authorize and connect their own third-party tools—CRM, marketing, finance, support, and more—inside the product without building per-customer integrations. The platform handles authentication, field mapping, retries, monitoring, and connection health, including automatic recovery when a sync fails or an API changes.
Core components include Workflows (visual and code-based, versioned, with triggers, cross-tool steps, per-tenant runs, retries, and per-step logging), a Unified API providing one schema across systems, an MCP Gateway for governed tool access by AI agents, and Integration agents that assemble mappings from a described integration. A connector catalog spans categories such as CRM, marketing automation, finance and ERP, support, communication, productivity, data and storage, and commerce, with connectors activatable and configurable per customer. Connection health, logs, and alerts are surfaced per customer.
fastn is aimed at product and engineering teams building customer-facing integrations, as well as revenue and customer success teams. It offers a free starting tier with a limited number of connected accounts, no card required, and scales on a pay-as-you-go basis; a demo is also available. Security features include SOC 2, RBAC, private networking, observability, and self-hosting options.
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