# emit

> emit (rssemit.com) is a programmable RSS feeds platform: pipe anything on the web into a clean RSS feed (ingest), improve it (transform), and deliver it anywhere (deliver). Common uses: turn a blog's RSS into a paid-per-email newsletter; get an RSS feed for a page that has none (changelogs, government notices, jobs boards) and push new entries to Slack/Discord or email; follow a topic by plain-language prompt and read one LLM-filtered feed instead of forty tabs; merge/dedupe/filter an overflowing reader into one feed; receive every new matching item as a signed webhook. Point it at an RSS feed and it emails new posts to your subscribers from your own domain; describe an interest in plain language and emit discovers sources, LLM-filters every item, and emits a durable Atom/JSON feed; point it at a page with no feed and it makes one. Feeds can also be pushed to Slack/Discord or signed webhooks. Pricing is pay-per-use from one prepaid balance ($1.60 per 1,000 credits, $10 minimum top-up, no subscriber tiers, no monthly fee): creating and serving feeds is free; 1 credit per email sent; 1 credit per 5 items the LLM filter judges; 1 credit per item summarized; 25 credits to re-run source discovery. A feed filtering ~40 items/day costs about $0.38/month. It is API-first (OpenAPI 3.1), ships an MCP server and a Claude Code skill, and is built by Helton Labs LLC.

Key facts:
- Smart feeds (`watcher` objects in the API): `POST /v1/watchers` with a natural-language prompt auto-discovers sources; or pass `sources` (feed or page URLs) to filter/merge feeds you already have. Output feeds live at `/w/{token}/atom.xml` and `/w/{token}/feed.json`; `POST /v1/watchers/{id}/pipe` broadcasts one as an email newsletter in one call.
- Filtering is auditable: every item carries a relevance score + reason; suppressed items are inspectable; "more/less like this" feedback tunes the threshold; duplicates collapse on canonical URL; optional per-item LLM summaries.
- Chat sinks: `POST /v1/sinks` pushes any feed's new items to a Slack or Discord incoming webhook. Outbound webhooks are HMAC-signed, retried with backoff, and have a delivery log.
- Metering is one prepaid balance: 1 credit per email sent, 1 credit per 5 items the filter judges, 1 credit per item summarized. Polling, feeds out, sinks, and webhooks are free. Feed-out is never gated.
- Feeds are polled every 5 minutes with conditional GET; `on_publish` mode + `POST /v1/feeds/{id}/ping` gives instant delivery from a webhook.
- Sending is from the customer's own verified domain (emit generates DKIM, SPF, and DMARC records).
- Hard bounces and complaints auto-suppress; every send carries one-click unsubscribe (List-Unsubscribe + List-Unsubscribe-Post).
- Subscribers can be imported via CSV (`POST /v1/subscribers/import`) or collected with embeddable subscribe forms.
- Example cost: a 5,000-subscriber blog publishing 4 times a month ≈ $32/month.

## Product pages

- [Feeds — anything to RSS](https://rssemit.com/watchers.html): feeds, pages, or a plain-language prompt in; one live filtered RSS feed out, with transparent sources
- [Page to feed](https://rssemit.com/page-to-feed.html): an RSS feed for any website, even ones without one

## Docs

- [API guide](https://rssemit.com/docs.html): hand-written walkthrough of domains, feeds, subscribers, and sending
- [OpenAPI 3.1 spec](https://api.rssemit.com/openapi.json): the complete machine-readable API surface
- [Claude Code skill](https://rssemit.com/skill.md): agent-facing setup guide — an agent can configure DNS, verify a domain, import subscribers, and send the first broadcast
- [Subscribe form snippets](https://rssemit.com/embed.html): copy-paste forms for Hugo, WordPress, Webflow, Wix, plain HTML, and React

## Comparisons

- [emit vs other RSS-to-newsletter tools](https://rssemit.com/compare.html): feature and pricing matrix vs Mailchimp, Substack, Buttondown, and beehiiv
- [Newsletter cost calculator](https://rssemit.com/cost-calculator.html): interactive apples-to-apples monthly-cost comparison across full newsletter platforms — Hakanai (the closest RSS-to-email analog), Mailchimp, Kit, Beehiiv, MailerLite, Substack, Buttondown, Ghost, and emit — plus a realistic DIY-on-AWS (SES + poller + database) estimate. emit is per-email; most others are per-subscriber
- [Substack vs emit](https://rssemit.com/vs-substack.html)
- [Mailchimp vs emit](https://rssemit.com/vs-mailchimp.html)
- [Buttondown vs emit](https://rssemit.com/vs-buttondown.html)
- [beehiiv vs emit](https://rssemit.com/vs-beehiiv.html)
- [Kit (ConvertKit) vs emit](https://rssemit.com/vs-convertkit.html)
- [MailerLite vs emit](https://rssemit.com/vs-mailerlite.html)
- [Ghost vs emit](https://rssemit.com/vs-ghost.html)
- [Feedrabbit vs emit](https://rssemit.com/vs-feedrabbit.html)
- [Blogtrottr vs emit](https://rssemit.com/vs-blogtrottr.html)
- [RSS.app vs emit](https://rssemit.com/vs-rss-app.html): RSS feeds for any website — free page watching + LLM filtering vs feed-count tiers
- [FetchRSS vs emit](https://rssemit.com/vs-fetchrss.html): feeds for pages without one, no post window or branding
- [Feedly Leo vs emit](https://rssemit.com/vs-feedly.html): AI filtering that outputs standard RSS instead of living in one reader
- [Zapier vs emit for RSS automation](https://rssemit.com/vs-zapier-rss.html): RSS → Slack/Discord without per-item task billing
- [Feed cost calculator](https://rssemit.com/watcher-cost-calculator.html): interactive estimate of LLM-filtered feed costs (judging, summaries, digests)

## Free tools

- [RSS-to-email preview](https://rssemit.com/rss-to-email-preview.html): paste an RSS/Atom feed and see how it renders as an email (single post or digest), plus a feed health check — runs entirely in the browser
- [Email subject line tester](https://rssemit.com/subject-line-tester.html): score a subject line for length, mobile truncation, spam-trigger words, caps, and emoji, with a live inbox preview
- [Free HTML email templates](https://rssemit.com/email-templates.html): four copy-paste, responsive, inline-styled newsletter templates (single post, digest, changelog, minimal)

## Guides

- [Zero to a working feed pipeline with Claude Code or any agent](https://rssemit.com/blog-agent-quickstart.html): one pasted prompt — account, topic feed, filtered RSS feed, daily email digest — via the hosted MCP server or four curl calls
- [Any page to RSS to Slack](https://rssemit.com/blog-page-to-slack.html): watch a site with no feed and push new entries into Slack/Discord
- [Merge, dedupe, and LLM-filter your subscriptions into one feed](https://rssemit.com/blog-tame-your-reader.html): 30 feeds in, one auditable filtered feed out
- [Send your Hugo blog as a newsletter](https://rssemit.com/blog-hugo-newsletter.html): from-scratch setup — account, domain, feed, subscribe form
- [Blog](https://rssemit.com/blog.html) ([RSS](https://rssemit.com/feed.xml))

## Optional

- [Changelog](https://rssemit.com/changelog.html)
- [Status](https://rssemit.com/status.html)
- [Terms](https://rssemit.com/terms.html), [Privacy](https://rssemit.com/privacy.html)