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API Direct – Get Substack Note by URL or ID
x402
API Direct – Get Substack Note by URL or ID is a paid API for AI agents from x402.apidirect.io, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-30).
Fetches a single Substack note (short-form post) along with its replies, given a note URL or numeric note ID, with optional AI emotion analysis.
Price / call$0.004
Success—
StatusUnknown
How this service works
Get a Substack Note by URL or ID, with its replies.
Output
Returns the Substack note's content (text, author, timestamp, engagement counts) along with its reply thread. If get_sentiment is enabled, each item also includes Plutchik's Wheel emotion scores, the dominant emotion, intensity level, and polarity (positive/negative/neutral).
Example use cases
Track reaction to a viral Substack note
“Fetch this Substack note at https://substack.com/@hamish/note/c-355659691 along with all its replies, and turn on the emotion analysis so I can see how people are reacting emotionally.”
Monitor replies to a specific note
“Get me the full thread for Substack note ID c-398271045, including all the replies — I want to see what people are saying in response.”
Sentiment check on a controversial note
“Look up Substack note c-412083776 and fetch it with sentiment analysis enabled — I want to know the dominant emotion and whether the tone is positive or negative.”
Technical details
Endpoint
GEThttps://x402.apidirect.io/v1/substack/note?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need the full content and reply thread of a specific Substack note identified by URL or ID. Prefer this over Substack search endpoints when you already have the note's URL or numeric ID and want structured data including replies. Choose the sentiment option when you need emotion analysis without a separate NLP call.
Side effects
- Note URL or ID not found — returns 404 or empty result
- Invalid URL format — returns validation error
- Note has been deleted or made private — returns error or empty content
- Rate limit exceeded — returns 429
- Payment not attached or insufficient — returns 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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