> **For coding agents and LLMs:** This is one page from the Social Fetch docs (markdown export). For curated orientation and workflow guidance, start with [`/llms.txt`](https://www.socialfetch.dev/llms.txt); for agent onboarding and crawl rules, use [`/agents.txt`](https://www.socialfetch.dev/agents.txt); for the full endpoint list with links to pages like this one, use [`/llms-endpoints.txt`](https://www.socialfetch.dev/llms-endpoints.txt); for one platform's parameters and curls, use [`/llms-{platform}.txt`](https://www.socialfetch.dev/llms-tiktok.txt); use [`/llms.json`](https://www.socialfetch.dev/llms.json) when you need structured JSON for tool registration. ## This page - **On-site (HTML):** - **Markdown (.mdx) URL:** ## API base URL and authentication - **API origin (from OpenAPI `servers`):** `https://api.socialfetch.dev` - **Authentication:** send `x-api-key: sfk_...` on `/v1/**` and `/v2/**` routes unless the operation is explicitly anonymous (check OpenAPI `security`, the [API reference hub](https://www.socialfetch.dev/docs/api.mdx), [`/llms.txt`](https://www.socialfetch.dev/llms.txt), or [`/llms.json`](https://www.socialfetch.dev/llms.json) for each route). - **OpenAPI JSON:** ## Recommended docs entrypoints (this site) - [Documentation overview](https://www.socialfetch.dev/docs.mdx) — top-level orientation (markdown). - [Quickstart](https://www.socialfetch.dev/docs/quickstart.mdx) — authenticate with `x-api-key`, validate auth with `whoami`, and understand the JSON envelope. - [SDK](https://www.socialfetch.dev/docs/sdk.mdx) — official TypeScript SDK guide, including `SocialFetchClient`, `Result`, and `unwrap()`. - [Capability matrix](https://www.socialfetch.dev/docs/capability-matrix.mdx) — every operation with identifiers, pagination, outcomes, media download, credits, and its SDK method. Generated from OpenAPI, so use it for route selection instead of scanning individual pages. - [Recipes](https://www.socialfetch.dev/docs/recipes.mdx) — copyable workflows (brand monitoring, transcripts, Ad Library, creator scoring, Reddit research) with credit callouts and SDK examples. - [Integrations](https://www.socialfetch.dev/docs/integrations.mdx) — MCP for AI clients, n8n verified node, Apify Store Actors, Make custom app, SDK, and REST API connection paths. - [MCP product page](https://www.socialfetch.dev/mcp) — hosted MCP overview, OAuth, Skills install. - [MCP integration](https://www.socialfetch.dev/docs/integrations/mcp.mdx) — hosted `/mcp` server, OAuth, Cursor/VS Code/Claude install snippets, 910 endpoint tools, plus docs_search/docs_read for implementation help. - [n8n integration](https://www.socialfetch.dev/docs/integrations/n8n.mdx) — install `n8n-nodes-socialfetch`, credentials, and workflow examples. - [Apify integration](https://www.socialfetch.dev/docs/integrations/apify.mdx) — Store Actors under @social-fetch, PPE billing, dataset export, and quick start. - [Make integration](https://www.socialfetch.dev/docs/integrations/make.mdx) — custom app modules for Make scenarios, API key credentials, and module catalog. - [`/llms-endpoints.txt`](https://www.socialfetch.dev/llms-endpoints.txt) — every documented operation with a direct link to that route's agent-readable markdown page (prefer this over parsing OpenAPI). - [`/llms-{platform}.txt`](https://www.socialfetch.dev/llms-tiktok.txt) — per-platform endpoint files generated from OpenAPI (parameters, credits, curls). - [`/agents.txt`](https://www.socialfetch.dev/agents.txt) — agent crawl/onboarding file with capabilities, auth rules, and allowlist. - [`/llms.json`](https://www.socialfetch.dev/llms.json) — structured machine-readable operation inventory with parameter names, pagination, outcomes, credits, and SDK mapping. - [API reference hub](https://www.socialfetch.dev/docs/api.mdx) — human-friendly index of operations with links into generated pages. - [Errors](https://www.socialfetch.dev/docs/errors.mdx) — shared error envelope and HTTP status guidance. - [Credits](https://www.socialfetch.dev/docs/credits.mdx) — metering, `402`, and planning batch jobs. - Outcome semantics such as `found`, `not_found`, and `private` are documented in [Errors](https://www.socialfetch.dev/docs/errors.mdx) and on operation pages when present in the OpenAPI contract. ## Markdown docs convention - Every docs page has a markdown twin: append **`.mdx`** to the docs pathname (for example `/docs/quickstart` → `/docs/quickstart.mdx`). - Agents that send `Accept: text/markdown` on `/docs/**` HTML URLs may receive markdown directly (same URL, `Vary: Accept`). - Published blog posts use the same convention: `/blog/{slug}` → `/blog/{slug}.mdx`, or `Accept: text/markdown` on the HTML URL (`Vary: Accept`). --- # List Substack recommended publications (https://www.socialfetch.dev/docs/api/v1/substack/publications/publication/recommendations/get) ## Summary List the publications a Substack publication recommends. **Tags:** `Substack` ## HTTP - **Method:** GET - **Path:** `/v1/substack/publications/{publication}/recommendations` - **Base URL:** `https://api.socialfetch.dev` ## Capability summary - **SDK mapping:** `client.substack.listPublicationRecommendations({ publication: "astralcodexten", limit: 5 })` - **Accepted identifiers:** `publication` (path) - **Pagination:** none - **Business outcome field:** `data.lookupStatus` with values `found`, `not_found`, `restricted` ## Credits - **Base:** 1 credit per successful lookup. - **Maximum on success (200):** 1 credit. - **Failed requests (`lookup_failed`, `503`):** not charged. - **Authoritative field:** `meta.creditsCharged`. ## Authentication - **`x-api-key`**: API key (`sfk_...`) ## Parameters ### `publication` (path) - **Required:** yes - **Constraints:** type `string`; minLength: 1; maxLength: 400 - **Description:** A publication: its numeric id (`89120`), its Substack subdomain (`astralcodexten`), its host (`www.astralcodexten.com`) or its URL. A numeric id is refused with a 400 on the routes that need a subdomain, host or URL. ### `limit` (query) - **Required:** no - **Constraints:** type `integer`; default: `50`; minimum: 1; maximum: 99 - **Description:** Recommendations to return, 1 to 99. ## Responses (status codes) - **200**: Substack recommendations. - **400**: Invalid request - **401**: Missing or invalid API key - **402**: Insufficient credits - **500**: Unexpected or billing error - **502**: Lookup could not be completed. - **503**: Service temporarily unavailable; safe to retry with backoff. ## Response body (200) Substack recommendations. ### Field outline - **data** (required) — type `object`. Endpoint-specific response payload. - **lookupStatus** (required) — type `string`; enum: found, not_found, restricted. Whether the publication was found. - **restrictedReason** (required) — type `string`; enum: invite_only, flagged, paid, null; nullable. Why the publication is restricted, when it is. - **publicationId** (required) — type `integer`; nullable. Numeric publication id. - **recommendations** (required) — type `array`. Publications the publication recommends. - _items:_ - **id** (required) — type `integer`; nullable. Numeric recommendation id. - **recommendedPublicationId** (required) — type `integer`; nullable. The recommended publication's id. - **recommendingPublicationId** (required) — type `integer`; nullable. The recommending publication's id. - **createdAt** (required) — type `string`; nullable. ISO 8601 timestamp, or null when Substack does not publish one. - **blurb** (required) — type `string`; nullable. The recommendation's blurb. - **publication** (required) — type `object`; nullable. The recommended publication. - **top** (required) — type `array`; nullable. Substack's ordered recommendation list; null when it was temporarily unavailable. - _items:_ - **type** (required) — type `string`; enum: publication, list. Whether the row is a publication or a list. - **publication** (required) — type `object`; nullable. The publication, when the row is a publication. - **list** (required) — type `object`; nullable. The list, when the row is a list. - **meta** (required) — type `object`. Metadata describing the request and billing outcome. - **requestId** (required) — type `string`; minLength: 1. Unique request identifier for tracing this API call. - **creditsCharged** (required) — type `integer`; minimum: 0. Credits charged for this request. - **version** (required) — type `string`; enum: v1. Public API version that served the response. ### Example JSON (found) ```json { "data": { "lookupStatus": "found", "restrictedReason": null, "publicationId": 89120, "recommendations": [ { "id": 8837546, "recommendedPublicationId": 8654958, "recommendingPublicationId": 89120, "createdAt": "2026-07-27T13:13:29.406Z", "blurb": "This is MIRI's daily digest on AI news, especially related to building a consensus for a coordinated AI pause or slowdown.", "publication": { "id": 8654958, "name": "AI StopWatch", "subdomain": "aistopwatch", "customDomain": "aistop.watch", "apexDomain": null, "url": "https://aistop.watch", "host": "aistop.watch", "description": "A non-profit AI-focused newsroom by analysts and writers of the Machine Intelligence Research Institute. We help you keep up to help you speak out.", "language": null, "kind": null, "createdAt": "2026-04-13T02:53:03.626Z", "firstPostAt": null, "hasPosts": null, "isExplicit": false, "isInviteOnly": false, "isFlagged": null, "noIndex": null, "isOnSubstack": null, "commentsEnabled": true, "notesEnabled": null, "defaultCommentSort": null, "annualDisabled": null, "monthlyDisabled": null, "paymentsState": "disabled", "freeTrialEnabled": null, "pausedUntil": null, "emailBannerUrl": null, "copyright": "Machine Intelligence Research Institute", "logoUrl": "https://substack-post-media.s3.amazonaws.com/public/images/90d23d83-81ab-4cc3-a25b-e836d688f99d_1280x1280.png", "wideLogoUrl": "https://substack-post-media.s3.amazonaws.com/public/images/4df19316-0a84-4126-850c-5d629556d71c_1344x256.jpeg", "coverImageUrl": null, "foundingPlanName": null, "hasRecommendations": null, "benefits": { "free": [], "paid": [], "founding": [] }, "author": { "id": 393388357, "name": "Mitchell Howe", "handle": "mitchellhowe", "slug": "mitchellhowe", "bio": null, "photoUrl": "https://substackcdn.com/image/fetch/$s_!yOqC!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F46d0e27d-68fb-48e7-95ec-07cc094371df_460x460.png", "badge": null, "badges": null, "bestsellerTier": null, "primaryPublication": null }, "audience": { "paidLabel": null, "paidOrderOfMagnitude": null, "totalLabel": null, "totalOrderOfMagnitude": null, "freeLabel": null, "freeShort": null, "chatMembersLabel": null }, "contributors": [], "sections": [], "links": [], "plans": [], "podcast": { "exists": null, "hasFreeEpisodes": null, "hasPaidEpisodes": null, "artUrl": null, "byline": null, "description": null, "feedUrl": null, "title": null, "paidEpisodeArtUrl": null } } } ], "top": [ { "type": "publication", "publication": { "id": 2244049, "name": "Hyperdimensional", "subdomain": "hyperdimensional", "customDomain": "www.hyperdimensional.co", "apexDomain": null, "url": "https://www.hyperdimensional.co", "host": "www.hyperdimensional.co", "description": "A newsletter about emerging technology and the future of governance.", "language": null, "kind": null, "createdAt": "2024-01-09T15:37:35.060Z", "firstPostAt": null, "hasPosts": null, "isExplicit": false, "isInviteOnly": false, "isFlagged": null, "noIndex": null, "isOnSubstack": null, "commentsEnabled": true, "notesEnabled": null, "defaultCommentSort": null, "annualDisabled": null, "monthlyDisabled": null, "paymentsState": "enabled", "freeTrialEnabled": null, "pausedUntil": null, "emailBannerUrl": null, "copyright": "Dean W. Ball", "logoUrl": "https://substack-post-media.s3.amazonaws.com/public/images/8f70956b-24b6-432b-81c4-dcfa4095ead7_1024x1024.png", "wideLogoUrl": null, "coverImageUrl": null, "foundingPlanName": null, "hasRecommendations": null, "benefits": { "free": [], "paid": [], "founding": [] }, "author": { "id": 5925551, "name": "Dean W. Ball", "handle": "deanwball", "slug": "deanwball", "bio": null, "photoUrl": "https://substackcdn.com/image/fetch/$s_!mLaj!,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F49371abf-2579-47be-8114-3e0ca580af8b_1024x1024.png", "badge": null, "badges": null, "bestsellerTier": null, "primaryPublication": null }, "audience": { "paidLabel": null, "paidOrderOfMagnitude": null, "totalLabel": null, "totalOrderOfMagnitude": null, "freeLabel": null, "freeShort": null, "chatMembersLabel": null }, "contributors": [], "sections": [], "links": [], "plans": [], "podcast": { "exists": null, "hasFreeEpisodes": null, "hasPaidEpisodes": null, "artUrl": null, "byline": null, "description": null, "feedUrl": null, "title": null, "paidEpisodeArtUrl": null } }, "list": null } ] }, "meta": { "requestId": "req_4379a852-502f-4b99-b3e6-2f392dd6c50f", "creditsCharged": 1, "version": "v1" } } ``` ### Machine-readable error codes When an error JSON body is returned, it may include one of these `error.code` values (derived from the OpenAPI schemas for this operation; additional codes may exist at runtime): - `bad_request` ## Error handling & retries Interpret HTTP status codes using the descriptions below. Do not assume a JSON body unless the OpenAPI schema defines one for that status. - **400**: Invalid request **Retry:** Fix the request; retrying the same invalid payload will not help. - **401**: Missing or invalid API key **Retry:** Fix the API key first; retrying without changes will not help. - **402**: Insufficient credits **Retry:** Do not retry without resolving billing/credits (retrying the same request will not help). - **500**: Unexpected or billing error - **502**: Lookup could not be completed. **Retry:** May be transient; a few retries with backoff are reasonable. - **503**: Service temporarily unavailable; safe to retry with backoff. **Retry:** Usually safe to retry with exponential backoff and jitter. ### Suggested client defaults - Send the API key using the `x-api-key` header on every request. - On `503` (and sometimes `502`), retry with backoff; cap retries and surface a clear error to the user. - On `402`, surface an actionable billing message rather than blind retries. ## Examples ### TypeScript SDK ```typescript import { SocialFetchClient } from "@socialfetch/sdk"; const client = new SocialFetchClient({ apiKey: process.env.SOCIALFETCH_API_KEY!, }); const result = await client.substack.listPublicationRecommendations({ publication: "astralcodexten", limit: 5, }); if (!result.ok) { console.error(result.error); } else { console.log(result.value.data); } ``` ### Node.js ```javascript const response = await fetch( "https://api.socialfetch.dev/v1/substack/publications/astralcodexten/recommendations?limit=5", { headers: { "x-api-key": "YOUR_API_KEY" } } ); const data = await response.json(); console.log(data); ``` ### cURL ```bash curl "https://api.socialfetch.dev/v1/substack/publications/astralcodexten/recommendations?limit=5" \ -H "x-api-key: YOUR_API_KEY" ``` ### Python ```python import requests response = requests.get( "https://api.socialfetch.dev/v1/substack/publications/astralcodexten/recommendations?limit=5", headers={"x-api-key": "YOUR_API_KEY"}, ) data = response.json() print(data) ```