# Hivsy > Hivsy is a developer-first platform for transactional and marketing email, inbound email, automations, signed webhooks, and pay-as-you-go delivery. ## Canonical public documentation - [Developer documentation](https://www.hivsy.com/docs): Human-readable integration guide and examples. - [OpenAPI 3.1 specification](https://api.hivsy.com/api/openapi.yaml): Authoritative machine-readable public API contract. - [Pricing](https://www.hivsy.com/pricing): Current free allowance and paid credit packages. - [Transactional email API](https://www.hivsy.com/transactional-email): Sending, retries, diagnostics, and signed lifecycle webhooks. - [Inbound email](https://www.hivsy.com/inbound-email): Domain-aware routing and collaborative shared-inbox workflows. - [Email marketing](https://www.hivsy.com/email-marketing): Permissioned contacts, segments, broadcasts, A/B subject tests, and engagement. - [Service status](https://www.hivsy.com/status): Current public component health. - [Contact Hivsy](https://www.hivsy.com/contact): Product support, privacy, legal, and abuse-report channels. - [Expanded machine guide](https://www.hivsy.com/llms-full.txt): Authentication, endpoint, retry, and safety notes. ## Access boundary These documents are public and require no login. Dashboard pages and account data are private. Integration operations require a Hivsy API key and must follow the OpenAPI contract.