Readwise API

API for syncing and accessing reading highlights from Kindle, Instapaper, Pocket, articles, books, and tweets. Also provides Readwise Reader API for managing a read-later queue and highlights.

Evaluated Mar 06, 2026 (0d ago) vcurrent

Homepage ↗ Developer Tools readwise highlights reading knowledge-management productivity rest-api reader

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

100

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Reading/highlights API. Token auth. Personal reading data — treat as private. No sensitive financial/health data typically. Export functionality could expose full library.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

An agent needs to access a user's personal reading highlights and annotations from Readwise to build a personalized knowledge base or learning system.

Avoid When

You need enterprise knowledge management or real-time content aggregation at scale.

Use Cases

• Syncing personal reading highlights into agent knowledge bases for RAG
• Building spaced repetition or learning systems from reading highlights
• Accessing annotated articles and books for writing assistance agents
• Creating automated highlight summaries and digests from reading queues
• Connecting Readwise data to Obsidian, Notion, or other PKM tools via agents

Not For

• Publishing or distributing copyrighted content (highlights only, not full text)
• Real-time web scraping (Reader is for personal reading queue)
• Enterprise knowledge management at scale
• Non-personal use cases (consumer-focused product)

Interface

REST API

Yes

GraphQL

gRPC

MCP Server

SDK

Webhooks

Authentication

Methods: api_key bearer_token

OAuth: Yes Scopes: No

Token-based auth using Authorization: Token <key> header. Personal access tokens available from account settings. OAuth2 app authorization also available. Simple and accessible for agents.

Pricing

Model: subscription

Free tier: No

Requires CC: Yes

API access included with Readwise subscription. Affordable consumer pricing. No per-API-call costs. Free trial available.

Agent Metadata

Pagination

cursor

Idempotent

Full

Retry Guidance

Not documented

Known Gotchas

⚠ Rate limits undocumented — agents should implement conservative throttling
⚠ Highlights API and Reader API are separate systems with different base URLs
⚠ Book and article metadata completeness varies by source (Kindle vs Instapaper vs manual)
⚠ No webhooks — agents must poll for new highlights
⚠ Tags and categories are user-defined and inconsistent across users
⚠ Full text of articles not available via API — highlights only

Alternatives

notion-api

Full Evaluation Report

Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Readwise API.

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Scores are editorial opinions as of 2026-03-06.