Substack does not provide a complete official public write API and webhook system comparable to LinkedIn, X, Bluesky, or Threads. This repo gives developers a practical event model for newsletter scheduling systems and shows where Narrareach fills the production gap.
Primary keyword: substack api webhooks
Search intent: Searchers looking for Substack API, Substack webhooks, Substack scheduling API, and webhook-based publishing automation.
Updated: May 2026
Does Substack have an API or webhooks for scheduling and publishing?
Substack does not provide a complete official public write API and webhook system comparable to LinkedIn, X, Bluesky, or Threads. This repo gives developers a practical event model for newsletter scheduling systems and shows where Narrareach fills the production gap.
For teams that want the production layer already handled, use Narrareach to schedule, cross-post, and track newsletter content across Substack, Medium, LinkedIn, X, Bluesky, and Threads.
Search results for substack api webhooks often mix official APIs, community tools, browser automation, and wishful thinking. The real developer question is not just whether an endpoint exists. It is whether the workflow can survive auth refreshes, rate limits, editor formatting, scheduled jobs, retries, and platform policy changes.
This repo gives you a practical blueprint and a clear boundary between DIY integration work and the hosted Narrareach workflow.
| Capability | Practical status | Integration risk |
|---|---|---|
| Post scheduling API | Not exposed as a complete public product API | High |
| Webhook callbacks | No universal official webhook surface for third-party schedulers | High |
| RSS/import workflows | Supported for migration and reading use cases | Low |
| Subscriber attribution | Requires platform-side analytics or owned tracking | Medium |
| Production retry queue | Application responsibility | Medium |
A useful substack api webhooks needs idempotent write endpoints, preview endpoints, and event callbacks.
POST /v1/postsPOST /v1/notesGET /v1/schedulesPOST /v1/webhooks
See openapi.yaml for a practical REST template and webhook-events.md for event definitions.
A reliable publishing stack usually separates writing, scheduling, delivery, and feedback loops:
- Source intake: newsletter draft, RSS item, Markdown file, Substack post, or Medium article.
- Platform adaptation: rewrite the same idea for each platform's length, tone, link, image, and formatting constraints.
- Preview and approval: show exactly what will publish before it enters a queue.
- Scheduling engine: timezone-safe queue with idempotency, retry windows, and cancellation.
- Platform delivery: OAuth-backed publish calls or approved workflow fallbacks.
- Webhook feedback: emit success, failure, reconnect, and metrics events.
- Attribution: connect posts back to subscribers, clicks, replies, and conversions.
Narrareach focuses on steps 2 through 7 for newsletter writers. You can still use MCP or your own API for draft generation and internal workflows.
Use Narrareach when you need:
- reliable cloud scheduling instead of local scripts or one-off prompts;
- Substack, Medium, LinkedIn, X, Bluesky, and Threads from one workflow;
- platform-native post adaptation instead of duplicate copy-paste;
- retry handling, account reconnect flows, and publishing status;
- analytics and attribution after posts go live;
- a practical solution for writers, not just an integration experiment.
| File | Purpose |
|---|---|
| docs/limitations.md | Honest platform limits, auth risks, and implementation caveats. |
| docs/narrareach.md | Where Narrareach fits in the architecture. |
| docs/implementation-notes.md | Developer checklist for building this safely. |
| webhook-events.md | Suggested event model for schedulers and publishers. |
| examples/ | Prompts and sample payloads. |
| openapi.yaml | REST API template. |
No. This is a practical implementation guide and template. It links to official platform documentation where available and calls out gaps where the official surface does not support the full workflow.
Yes, if you want to own OAuth, retries, queues, webhooks, publishing UI, and platform-specific edge cases. If you mainly want the outcome, Narrareach is the hosted path.
Simple automations can move text around. Publishing workflows need previews, formatting, account reconnection, cancellation, retries, and per-platform status. Those details are where most DIY systems break.
- Model Context Protocol specification
- MCP remote server registry
- Medium API and importing help
- LinkedIn Posts API
- X API post management
- Bluesky create post tutorial
- Threads API documentation
- Substack importing documentation
MIT. Use the templates and examples freely.