Products
Every product runs on the same key, the same SDK, the same signed webhooks and the same log, so the next one you add needs no new setup.
- Emailcoss.com Email is a transactional email API. Send single, batch and scheduled email from your domains, with templates, tracking and per-recipient webhooks.
- Marketing emailcoss.com Marketing email sends newsletters and announcements to your contacts as broadcasts, with audiences, segments, topics and a hosted preference center.
- Inboxescoss.com Inboxes give every AI agent its own email address. Mail arrives as threads with a webhook per message, and the agent replies from the same address.
- Inbound emailcoss.com Inbound email receives mail at your domain or at an address coss.com gives each environment, and calls your webhook with every message, parsed.
- Email for platformscoss.com Email for platforms gives each of your users a sub-account with its own domains, sending reputation, quotas and suppression list, all on your API key.
- SMTP relaycoss.com's SMTP relay sends email from anything that speaks SMTP, with an API key as the password and the same checks, tracking and webhooks as the API.
Messaging
- SMScoss.com SMS is an API that sends and receives text messages from your own phone numbers, with US 10DLC and toll-free registration done for you.
- Verifycoss.com Verify is a one-time code API that proves someone has a phone number or mailbox, with a fraud guard that stops SMS pumping before you pay.
- Signcoss.com Sign is an e-signature API. People sign PDFs inside your app or from an email, and you get a sealed PDF with a hash-chained audit trail.
- Formscoss.com Forms is a form backend. Point any HTML form at an endpoint, and every submission is screened for spam and sent to webhooks, email and contacts.
Trust
- Hookscoss.com Hooks is webhooks as a service. Send an event once and coss.com signs, delivers and retries it to every endpoint your customers registered.
- Riskcoss.com Risk is a fraud and abuse API. It scores sign-ups, logins, checkouts and messages and answers allow, review or block, with the reasons why.
- Rate limitingcoss.com rate limiting is a hosted rate limiter for your own endpoints. Define buckets once and check any key, a user, email or IP, with one call.
Platform
- PlatformThe coss.com platform is what every product shares. Environments and scoped keys, signed webhooks, searchable logs, dated API versions and one bill.
- Securitycoss.com security covers who gets in and what is kept. SSO, SCIM, two-factor and passkeys, roles, an audit log, abuse screening and a retention policy.
Developers
- Coding agentscoss.com for coding agents is a one-line setup for Claude Code, Cursor and Codex. Markdown docs, a sandbox key, an MCP server and an Agent Skill.
- SDKs and toolscoss.com SDKs and tools cover every language you ship in. A zero-dependency TypeScript SDK, six generated SDKs, framework drivers, a CLI and OpenAPI 3.1.
One key for all of it.
Start with a development key: every product works in sandbox, and nothing is billed.
Add coss.com to this project: read https://coss.com/llms.txt, get a development key with `npx coss-cli init --agents`, and build and test with it.