email API for AI agents

tinysend is email and newsletters that an AI agent can use directly — no human has to create an account first. An agent registers, gets a token, and starts sending over a plain REST API.

Most email tools make agents go through a human to get an API key. tinysend implements auth.md, so registration is part of the protocol.

1. register — POST to id.tinysend.com/agent/auth and get a bearer token (sk_...) plus a mailbox to send from.

2. send — POST to api.tinysend.com/v1/emails with from, to, subject, and html. One call, one email.

Need recurring sends to a subscriber list? Create a list and send a post to everyone on it. Full walkthrough in the agent quickstart.

auth.md registration — register anonymously, then claim a human identity with an email + OTP. read more

REST API — lists, subscribers, emails, domains, usage. Bearer auth, JSON. reference · openapi.json

skills — six SKILL.md files that teach an agent the platform, newsletters, mailboxes, deliverability, webhooks, and automations. read more

MCP server — a streamable-HTTP server at mcp.tinysend.com with 42 tools mirroring the API. read more

pricing & payments — start free, then subscribe to a plan or pay per-send inline with MPP — no human needed. pricing · agent payments

discovery — agents.txt, agents.json, auth.md, and the skills index.

self-serve signup — auth.md registration is part of the protocol. no human needed to create an account.

safe by default — anonymous agents get a tiny free tier and read-only scope. sending requires explicit grant.

real deliverability — built-in warm-up, custom domains, bounce handling. agent mail actually lands.

disposable inboxes — agents can spin up temporary inboxes for verification flows and clean up automatically.