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API · /substack-api

Substack API

healthy 4,150 Subscribers

Live data for any Substack publication, served straight from the publication's own public API — no key, nothing cached. Substack is the newsletter-and-blogging social platform; this reads a writer's public posts and their engagement. The posts endpoint returns a publication's recent or top posts with the title, subtitle, slug, publish date, post type (newsletter, podcast or thread), audience (free or paywalled), the heart-reaction count, the comment count, the word count and the cover image — Noah Smith's Noahpinion shows posts pulling hundreds of reactions and dozens of comments. The search endpoint searches a publication's archive by keyword. The post endpoint returns one post in full, including a plain-text excerpt of the body, its reactions and comment count. Point it at any publication by its Substack subdomain (noahpinion) or its custom domain (astralcodexten.com) and it follows the publication wherever it lives. This is the writer-and-post engagement layer for any media-monitoring, newsletter-analytics, reading or social app. Live from Substack, nothing stored. Distinct from dev-community and microblog APIs — this is Substack newsletter posts and their engagement. 4 endpoints.

#substack #newsletter #blogging #social #writers #posts #engagement
api.oanor.com/substack-api
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Machine-readable spec so AI agents can integrate this API.

/api/substack-api/openapi.json
/api/substack-api/llms.txt

Discovery: GET /api/index.json lists every API.

Substack API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
546 ms
Server probes · 24h
Subscribers
4,150
active
Total calls
76
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 13,500 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 13,500 calls/month
  • 3 req/sec
  • Posts, search & full post
  • No credit card
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Starter

€6.50 /month

  • 170,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 170,000 calls/month
  • 8 req/sec
  • Reactions, comments & word counts
  • Email support
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Pro

€17.00 /month

  • 720,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 720,000 calls/month
  • 15 req/sec
  • Media-monitoring & analytics pipelines
  • Priority support
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Scale

€40.50 /month

  • 3,600,000 calls / month
  • 30 requests / second
  • Hard cap (429 above quota, no overage)
  • 3,600,000 calls/month
  • 30 req/sec
  • Newsletter-intelligence scale
  • Dedicated SLA
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Substack API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Substack API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Substack API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Substack API cost?
Substack API has a free tier with 100 calls / month. Paid plans start at €6.50 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Substack API GDPR-compliant?
All requests to Substack API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/substack-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/substack-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/substack-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/substack-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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