# WriteStack

**Canonical:** https://apis.io/providers/writestack/  
**Website:** https://www.writestack.io/  
**APIs profiled:** 2

WriteStack is a Substack growth platform that helps creators schedule, analyze, and monetize their Substack newsletters. It offers tools to draft notes, schedule posts, track audience engagement, and provides a writing coach to generate outlines. The service aims to streamline content creation, improve subscriber growth, and give creators analytics to optimize their newsletters.

## Kin Score — 40.3 / 100 (developing)

Scored 2026-10-31 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 53.6 |
| Contract Quality | 28.2 |
| Contract Governance | 19.7 |
| Operational Transparency | 18.4 |
| Developer Ergonomics | 45.2 |
| Access Clarity | 63.2 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 24.5 (matched via fallback).

## Agent readiness — 39.1 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | served |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | yes |
| Agent Skills | no |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | served |
| Protected Resource Metadata | verified |
| Dynamic Client Registration | yes |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | mostly |

## APIs (2)

- **WriteStack API** — WriteStack provides tools for Substack creators to schedule, analyze, and monetize newsletters via a developer portal.
- **WriteStack API** — WriteStack API as documented publicly: 20 operations. Contract generated from the documentation by API Evangelist (2026-10-27); not the provider's own document.

## Security (2)

- **Writestack Authentication** — 1 scheme
- **Writestack Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Writestack Plans Pricing**

## Tags

Company, Substack, Growth, Analytics, ContentCreation

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/writestack/). Scores are computed from the provider's own public artifacts under a published rubric.