# Buttondown **Canonical:** https://apis.io/providers/buttondown/ **Website:** https://buttondown.com/ **APIs profiled:** 30 Buttondown is an independent, bootstrapped email newsletter platform for writers, creators and developers, offering a Markdown and rich-text editor, subscriber management with tags, segments and metadata, automations, RSS-to-email, surveys, comments, paid subscriptions via Stripe with no revenue share, custom sending and hosting domains, and hosted archives. Its public REST API covers 133 operations across 29 resource areas — subscribers, emails, tags, segments, automations, webhooks, imports, exports, surveys, forms, images, snippets, prices and more — described by a live OpenAPI 3.1 document, backed by an 82-event webhook catalog, a date-based version train, idempotency keys, and a first-party CLI for syncing newsletter content to a local folder. ## Kin Score — 71.3 / 100 (exemplar) Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 71.3). | Facet | Score | |---|---| | Discoverability | 83.3 | | Contract Quality | 70.4 | | Governance | 16.7 | | Contract Governance | 16.7 | | Operational Transparency | 92.1 | | Developer Ergonomics | 73.2 | | Commercial Clarity | 73.7 | | Access Clarity | 73.7 | Regulatory layer — **Telecommunications**: 43.1 (matched via tags). ## Agent readiness — 54.5 (agent-native) | Dimension | Value | |---|---| | Spec Presence | yes | | Agentic Access | derived | | Reversibility Documented | no | | MCP Server | no | | Auth Clarity | yes | | Idempotency | documented | | Error Semantics | verified | | OpenAPI Examples | partial | | Rate Limit Signal | verified | | Event Surface Described | yes | | Agent Skills | derived | | Well Known Catalog | no | | Consent Identity | yes | | Agent Card | no | | Dry Run Mode | no | ## Access Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high). ## APIs (30) - **Buttondown Accounts API** — The Accounts API from Buttondown — 1 operation(s) covering the authenticated account and its plan/feature state. - **Buttondown Advertising Units API** — The Advertising Units API from Buttondown — 6 operation(s) covering newsletter sponsorship inventory — advertising units and the slots sold against them. - **Buttondown API Requests API** — The API Requests API from Buttondown — 2 operation(s) covering the account's own API request log, including retained response bodies for idempotent requests. - **Buttondown Attachments API** — The Attachments API from Buttondown — 4 operation(s) covering files attached to emails and inbox replies. - **Buttondown Automations API** — The Automations API from Buttondown — 7 operation(s) covering triggered and scheduled email sequences, their actions, timing and analytics. - **Buttondown Books API** — The Books API from Buttondown — 5 operation(s) covering the Bookshop.org book catalog embedded in newsletters. - **Buttondown Bulk Actions API** — The Bulk Actions API from Buttondown — 2 operation(s) covering asynchronous mass operations over existing records. - **Buttondown Comments API** — The Comments API from Buttondown — 5 operation(s) covering subscriber comments on emails, and their moderation state. - **Buttondown Coupons API** — The Coupons API from Buttondown — 1 operation(s) covering Stripe coupons available to a paid newsletter. - **Buttondown Emails API** — The Emails API from Buttondown — 11 operation(s) covering drafting, scheduling, publishing, rendering and analyzing newsletter emails. - **Buttondown Events API** — The Events API from Buttondown — 2 operation(s) covering the unified event store that also powers webhooks. - **Buttondown Exports API** — The Exports API from Buttondown — 3 operation(s) covering data exports of subscribers, emails and events. - **Buttondown External Feeds API** — The External Feeds API from Buttondown — 7 operation(s) covering RSS-to-email feeds, their polling cadence and the items they produce. - **Buttondown Forms API** — The Forms API from Buttondown — 5 operation(s) covering hosted and embeddable subscription forms. - **Buttondown Images API** — The Images API from Buttondown — 4 operation(s) covering images hosted for use in emails and archives. - **Buttondown Imports API** — The Imports API from Buttondown — 5 operation(s) covering bulk subscriber imports — the supported path for adding subscribers at volume. - **Buttondown Newsletters API** — The Newsletters API from Buttondown — 7 operation(s) covering newsletter settings, branding, locale, and custom sending/hosting domain verification. - **Buttondown Notes API** — The Notes API from Buttondown — 3 operation(s) covering internal notes attached to subscribers and team members. - **Buttondown Ping API** — The Ping API from Buttondown — 1 operation(s) covering a connectivity and credential health check. - **Buttondown Prices API** — The Prices API from Buttondown — 3 operation(s) covering paid-subscription pricing and products. - **Buttondown Public API** — The Public API from Buttondown — 1 operation(s) covering the unauthenticated public archive search. - **Buttondown Segments API** — The Segments API from Buttondown — 5 operation(s) covering saved, reusable audiences built from tag and metadata filters. - **Buttondown Snippets API** — The Snippets API from Buttondown — 5 operation(s) covering reusable content snippets referenced from emails. - **Buttondown Subscribers API** — The Subscribers API from Buttondown — 12 operation(s) covering subscriber lifecycle — creation, updates, tags, referrals, automations and Stripe subscriptions. - **Buttondown Survey Responses API** — The Survey Responses API from Buttondown — 3 operation(s) covering responses collected from newsletter surveys. - **Buttondown Surveys API** — The Surveys API from Buttondown — 5 operation(s) covering surveys embedded in emails and on the archive. - **Buttondown Tags API** — The Tags API from Buttondown — 6 operation(s) covering subscriber tags and their analytics. - **Buttondown Users API** — The Users API from Buttondown — 5 operation(s) covering team members on the account and their permissions. - **Buttondown Webhooks API** — The Webhooks API from Buttondown — 7 operation(s) covering webhook registration, delivery attempts, and test fires. - **Buttondown Newsletter Platform** — The Buttondown hosted newsletter platform provides a markdown-based composition experience, subscriber management, delivery infrastructure, analytics, monetization via paid subs... ## Agentic access (1) - **Buttondown Agentic Access** — 133 operations · 71 acting ## Security (3) - **Buttondown Authentication** — apiKey · 1 scheme - **Buttondown Domain Security** — TLSv1.3 · HSTS · DMARC - **Buttondown Vulnerability Disclosure** — security.txt · contact published ## Plans (1) - **Buttondown Plans Pricing** ## Tags Analytics, Automations, Email, Markdown, Newsletters, Paid Subscriptions, Software-as-a-Service, Subscribers, Webhook, Segmentation, Developer Tools, Marketing --- Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/buttondown/). Scores are computed from the provider's own public artifacts under a published rubric.