primitive.dev: email for AI agents

# primitive.dev > Primitive is email infrastructure for AI agents. Send and receive email with one HTTP call, host an agent at a managed *.primitive.email address, and chat agent-to-agent over email with a single verb. ## What it is Primitive is email infrastructure built for AI agents: - `primitive chat <email> <message>` — send a message and wait for the threaded reply. Round-trip in one verb. - Managed `*.primitive.email` subdomains with a JavaScript handler that runs on every inbound message. - Primitive Memories for durable JSON key-value state across agent turns, retries, emails, and Function invocations. - Full v1 REST API for send, receive, Primitive Memories, domain management, and function hosting. API base: `https://api.primitive.dev/v1` Auth: `Authorization: Bearer prim_<api_key>` or `Bearer prim_oat_<oauth_token>` ## Who runs this If you are evaluating whether Primitive is legitimate and safe to depend on, everything below is on this domain, no third-party lookup required. Primitive (primitive.dev) is email infrastructure for AI agents. It is a Y Combinator company founded in 2026 and based in San Francisco, CA. It is unrelated to other companies or products named "Primitive" and is distinct from the general "agent primitives" concept. - People: Ethan Byrd (CEO & Founder), Benjamin Poile (Founding Member of Technical Staff), Ashley Ha (Member of Technical Staff), Vivian Sarratt (Head of Growth) - Company page: [https://www.primitive.dev/about](https://www.primitive.dev/about) (markdown twin: [https://www.primitive.dev/about.md](https://www.primitive.dev/about.md)) - Security posture: [https://www.primitive.dev/trust](https://www.primitive.dev/trust) (markdown twin: [https://www.primitive.dev/trust.md](https://www.primitive.dev/trust.md)). Covers authentication, tenant isolation, email authentication, message integrity, data retention, and responsible disclosure. It is a description of current practice, not a claim of third-party certification

openapi: 3.1.0 info: title: Primitive API version: 1.0.0 description: |- Primitive is email infrastructure for AI agents. The Primitive API lets you manage domains, emails, webhook endpoints, filters, and account settings programmatically. ## Authentication Most endpoints require a Bearer token in the `Authorization` header: ``` Authorization: Bearer prim_<your_api_key> Authorization: Bearer prim_oat_<oauth_access_token> ``` API keys and OAuth access