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Substack Search API

POST

API health

24h health
Normal
24h average time
—
Last checked
September 26, 2026 at 18:04 (UTC)
  • Healthy / normal
  • Available
  • Limited
  • Mostly down
Health APINormal
How health is measured
  • Health = the share of calls that returned data, in percent. Empty results, failures and unknown outcomes do not count as returning data.
  • Levels: 90% and above is healthy, 70% and above is available, 40% and above is limited; anything lower is mostly down.
  • A period (the last 24 hours, one hour or one day) gets a score only once it has at least 50 calls. Periods with fewer calls show as normal: a few failures among a handful of calls do not mean the API is down.
  • Calls include real customer calls and our own daily probe calls. Request errors (wrong parameters, no balance) are excluded.
  • Average time counts only calls that completed normally: response time for sync calls, acceptance to completion for async ones.
By period
Time (UTC)StatusHealthAverage time
2026-09-26 18:00 - 18:59Normal——
2026-09-26 17:00 - 17:59Normal——
2026-09-26 16:00 - 16:59Normal——
2026-09-26 15:00 - 15:59Normal——
2026-09-26 14:00 - 14:59Normal——
2026-09-26 13:00 - 13:59Normal——
2026-09-26 12:00 - 12:59Normal——
2026-09-26 11:00 - 11:59Normal——
2026-09-26 10:00 - 10:59Normal——
2026-09-26 09:00 - 09:59Normal——
2026-09-26 08:00 - 08:59Normal——
2026-09-26 07:00 - 07:59Normal——
2026-09-26 06:00 - 06:59Normal——
2026-09-26 05:00 - 05:59Normal——
2026-09-26 04:00 - 04:59Normal——
2026-09-26 03:00 - 03:59Normal——
2026-09-26 02:00 - 02:59Normal——
2026-09-26 01:00 - 01:59Normal——
2026-09-26 00:00 - 00:59Normal——
2026-09-25 23:00 - 23:59Normal——
2026-09-25 22:00 - 22:59Normal——
2026-09-25 21:00 - 21:59Normal——
2026-09-25 20:00 - 20:59Normal——
2026-09-25 19:00 - 19:59Normal——
2026-09-26Normal——
2026-09-25Normal——
2026-09-24Normal——
2026-09-23Normal——
2026-09-22Normal——
2026-09-21Normal——
2026-09-20Normal——
2026-09-19Normal——
2026-09-18Normal——
2026-09-17Normal——
2026-09-16Normal——
2026-09-15Normal——
2026-09-14Normal——
2026-09-13Normal——
2026-09-12Normal——
2026-09-11Normal——
2026-09-10Normal——
2026-09-09Normal——
2026-09-08Normal——
2026-09-07Normal——
2026-09-06Normal——
2026-09-05Normal——
2026-09-04Normal——
2026-09-03Normal——
2026-09-02Normal——
2026-09-01Normal——
2026-08-31Normal——
2026-08-30Normal——
2026-08-29Normal——
2026-08-28Normal——

Search public results on Substack. Accepts these parameters: keyword. Returns these fields: author_username, avatar_url, handle, and custom_domain.

Price $1.39 per 1,000 requests ($0.001389 per call). Failed calls and empty results are not charged. Synchronous. For slow jobs add "mode": "async" to the body, take the job_id and poll.

Request parameters

NameInTypeRequiredDefaultDescription
AuthorizationheaderstringYes-Bearer followed by your API key. Create it in the console; never put it in a URL or a code repository.
platformbodystringYessubstackPlatform identifier, fixed value.
actionbodystringYessearchCapability identifier, fixed value.
keywordbody.paramsNot declaredYes-Specifies the discovery query string for locating Substack newsletters and publications. It does not perform full-text searches across post bodies.
limitbody.paramsinteger (1–30)No10

Code samples

bash
curl -X POST 'https://api.everyinfra.com/api/v1/social' \
  -H "Authorization: Bearer $EVERYINFRA_API_KEY" \
  -H 'Content-Type: application/json' \
  --data-raw '{
  "platform": "substack",
  "action": "search",
  "params": {
    "keyword": "climate"
  }
}'

[OpenAPI definition (JSON)]Samples read the key from the EVERYINFRA_API_KEY environment variable; copied code never contains your key.

Response example

Real response

Captured September 26, 2026 at 08:56 (UTC) by calling this API with the parameters in the code sample above. results and count are that call's real response with personal information (names, handles, avatars, profile links, contact details) removed; the list keeps the first 2. id, billing and quota differ on every call, so only their shape is shown.

json
{
  "id": "req_…",
  "platform": "substack",
  "action": "search",
  "results": [
    {
      "id": "1577253",
      "handle": "（已隐去）",
      "name": "Climate Drift",
      "url": "https://climatedrift.substack.com",
      "custom_domain": "www.climatedrift.com",
      "bio": "Your cheat-sheet to climate: Breaking down real solutions, hard numbers, and career moves for operators, founders, and investors who want impact.",
      "language": "en",
      "payments_enabled": true,
      "avatar_url": "https://substackcdn.com/（已隐去）",
      "cover_url": "https://substack-post-media.s3.amazonaws.com/public/images/1e57b0db-25cb-435f-b067-4bd437423c48_1280x1280.png",
      "platform": "substack",
      "author_name": "（已隐去）",
      "author_username": "（已隐去）"
    },
    {
      "id": "2693993",
      "handle": "（已隐去）",
      "name": "Your Daily Dose of Climate Hope",
      "url": "https://climateactapp.substack.com",
      "bio": "Action is the antidote to despair. Subscribe now to get one easy action to take every weekday, along with stories about the trends, innovations, and people creating a better world! Enjoy our Weekly Quiz on Saturdays and Good News Roundup on Sundays!",
      "language": "en",
      "payments_enabled": true,
      "avatar_url": "https://substackcdn.com/（已隐去）",
      "cover_url": "https://substack-post-media.s3.amazonaws.com/public/images/e88a5e06-81ff-4c12-be5a-55ecc6cfb03f_1280x372.png",
      "platform": "substack",
      "author_name": "（已隐去）",
      "author_username": "（已隐去）"
    }
  ],
  "count": 10,
  "billing": { … },
  "quota": { … }
}

Response fields

Business data is in results. The table lists the fields a record can contain; values the source does not provide are never made up.

FieldMeaning
idThe record's unique ID on the source platform. Unique only within one platform; IDs can repeat across platforms.
handleKeeps the platform's own meaning
nameName of the object itself, for account, product and business capabilities.
urlLink to the record on the source platform.
custom_domainKeeps the platform's own meaning
bioProfile bio written by the account; may contain line breaks and emoji.
languageContent language code (for example zh, en) as judged by the platform; it can be wrong.
subscriber_countKeeps the platform's own meaning
payments_enabledKeeps the platform's own meaning
avatar_urlAvatar image link. Some platforms return sized CDN links that can expire.
cover_urlKeeps the platform's own meaning
platformSource platform identifier, the same as platform in the request (for example xiaohongshu, tiktok).
author_nameAuthor's display name.
author_usernameAuthor's username (@handle), usually usable in URLs.
top_postsKeeps the platform's own meaning

Errors and billing

401
Missing or invalid key. Authentication runs before parameter checks, so unauthenticated requests never see the parameter schema.
422
Wrong parameter name or value. The error lists the parameters and allowed values this capability accepts and the closest match; it happens before any charge.
402
Insufficient balance. Top up first.
429
Per-minute request limit reached. Wait for Retry-After and try again.
503
Could not complete right now. Any charge for the call goes back to your balance automatically, and the billing receipt in the response states the actual outcome, including when it is not yet known. Do not resend blindly.
200 empty
The request completed without data and is not charged (billing.reason = empty_result_refunded).

Official references

Used only to check objects and terms. They do not imply authorization or endorsement of EveryInfra by the platform.