# sendm8

> sendm8 is a free, open-source form backend. Point any HTML form at a URL and get the submissions by email, Discord, Slack, Telegram or webhook. No server, no signup required.

Key facts:

- Endpoint: `POST https://sendm8.com/f/{formId}`, or `POST https://sendm8.com/f/{email}` with no account (the owner confirms once by email).
- Send `Accept: application/json` to get JSON back. Success: `{ "ok": true, "id": "…" }`. Failure: `{ "ok": false, "error": { "code": "…", "message": "…" } }` with a 4xx or 5xx status.
- Special fields match Formspree: `_replyto` (or `email`), `_subject`, `_next`, `_gotcha`, `_cc`.
- Forms are created by a person in the dashboard at https://sendm8.com/app. There's no API key for creating forms.

## Docs

- [The basic form](https://sendm8.com/docs/basic-form.md): Point an HTML form at your endpoint, with examples for React, Vue, Astro and Next.js.
- [No signup: email in the URL](https://sendm8.com/docs/zero-signup.md): Use /f/you@example.com with no account, confirm once by email, and claim the form later.
- [Special fields](https://sendm8.com/docs/fields.md): Formspree-compatible underscore fields: _replyto, _subject, _next, _gotcha and _cc.
- [AJAX / fetch](https://sendm8.com/docs/ajax.md): Submit with fetch and Accept: application/json. Response shapes and every HTTP status code.
- [AJAX without writing JavaScript](https://sendm8.com/docs/ajax-helper.md): The /s/v1.js helper: data-sendm8 attributes, success and error messages, and events.
- [Redirects & thank-you page](https://sendm8.com/docs/redirects.md): Where visitors land after a normal post, and why _next must be on an allowed domain.
- [Spam protection](https://sendm8.com/docs/spam.md): Honeypots, automatic spam scoring, Turnstile challenges and allowed domains.
- [File uploads](https://sendm8.com/docs/uploads.md): Accept files with multipart forms, size limits, and how files reach you.
- [Connect Discord](https://sendm8.com/docs/discord.md): Send submissions to a Discord channel with a webhook.
- [Connect Resend (BYOK)](https://sendm8.com/docs/byok.md): Send notification emails from your own domain with your own Resend API key.
- [Webhooks](https://sendm8.com/docs/webhooks.md): Receive submissions as signed JSON: payload, signature verification and retries.
- [Moving from Formspree](https://sendm8.com/docs/formspree.md): Migrate existing Formspree forms: URL changes, fetch and React code, and a prompt for AI assistants.
- [All docs in one file](https://sendm8.com/llms-full.txt): every section above, in order.

## Optional

- [Self-hosting](https://github.com/m8team/sendmate/blob/main/docs/self-hosting.md): run your own copy on Cloudflare.
- [Webhook payloads and signatures](https://github.com/m8team/sendmate/blob/main/docs/webhooks.md)
- [Pricing and fair-use limits](https://sendm8.com/pricing)