SocialToAIStart freeConsole
POST/v1/call/xiaohongshu.keyword_related

Xiaohongshu (RedNote) Pugongying related keywords API

Only on Xiaohongshu.

Get what people search on Xiaohongshu before and after a keyword, from the platform's creator marketplace, each with its place by relevance, its search index, the notes about it and their reads. A call to the Xiaohongshu (RedNote) Pugongying related keywords API costs 24 credits ($0.048 to $0.08 depending on the pack); failed calls are free. Call it over HTTP or from your AI client over MCP. Last tested 2026-10-31.

Start for freeSign in to run
100 credits on sign-up, no card needed
24 creditsper call, ≈ $0.048–$0.08
Up to 120 itemsfirst page only
2026-10-31last tested
884 Bsample response, 1 item

Last updated:

Daily watch: tell your AI “watch this daily” and this call runs by itself every day, sending only what is new: at most 744 credits a month, about $2.48. How to set it up

What you get from the Xiaohongshu (RedNote) Pugongying related keywords API.
From a recorded answer.

A recorded call returned 98 items; here is the first, field by field. Names and text are removed from the sample; the numbers are as recorded.

FieldIn the recorded answer
title烧烤
urlnull
rank1
heatnull
fields.related_to露营
fields.relationprior
fields.relevancenull: Xiaohongshu cannot give it
fields.search_index2,638,774
fields.composite_indexnull: Xiaohongshu cannot give it

24 credits a call (≈ $0.048–$0.08): about 125 calls for $10.

Xiaohongshu (RedNote) Pugongying related keywords API: request and response

curl https://api.socialtoai.com/v1/call/xiaohongshu.keyword_related \  -H "Authorization: Bearer $SOCIALTOAI_API_KEY" \  -H "Idempotency-Key: $(uuidgen)" \  -H "Content-Type: application/json" \  -d '{    "keyword": "面膜"  }'
import osimport uuidimport requestsresponse = requests.post(    "https://api.socialtoai.com/v1/call/xiaohongshu.keyword_related",    headers={        "Authorization": f"Bearer {os.environ['SOCIALTOAI_API_KEY']}",        # A new key for each request; the same one again retries it without paying twice.        "Idempotency-Key": str(uuid.uuid4()),    },    json={        "keyword": "面膜",    },)print(response.json())
# Connected over MCP? Ask in plain words.Use the Xiaohongshu PGY related keywords interface (xiaohongshu.keyword_related) with keyword: 面膜.# Your AI calls the call tool with:{  "keyword": "面膜"}
Sign in to run24 creditsOpens in the Playground with these parameters after you sign in. It never runs by itself.
200 OK884 B24 credits
{  "op": "xiaohongshu.keyword_related",  "platform": "xiaohongshu",  "status": "ok",  "items": [    {      "platform": "xiaohongshu",      "id": "烧烤",      "ref": "烧烤",      "approx": [],      "type": "entry",      "entry_type": "keyword_related",      "title": "烧烤",      "url": null,      "rank": 1,      "heat": null,      "fields": {        "related_to": "露营",        "relation": "prior",        "relevance": null,        "search_index": 2638774,        "composite_index": null      }    }  ],  "unavailable": ["fields.relevance", "fields.composite_index"],  "page": {    "has_more": false  },  "cost_credits": 24}
entry_type
keyword_related
related_to
露营
relation
prior
relevance
null
search_index
2638774
composite_index
null

Names and text were removed from the sample; the numbers are as recorded.

Sample data1 of the 98 items recorded

Xiaohongshu (RedNote) Pugongying related keywords API parameters.
1 parameter, all required.

Send them as a JSON body with POST. Your key goes in the Authorization header, never in the URL.

NameTypeRequiredDefaultDescription
keywordstringRequired—One keyword
First page only: up to 120 items, with no cursor parameter and no next page.

Xiaohongshu (RedNote) Pugongying related keywords API response fields.
What Xiaohongshu cannot give is marked.

FieldTypeMeaning
items[].titlestringThe entry's title or name.
items[].urlstringA link that opens it; null where the platform's list has none.
items[].rankintegerPosition on a board, from 1.
items[].heatintegerThe platform's heat score.
items[].fields.related_tostringThe keyword you asked about.
items[].fields.relationstringHow it is related: query (searched together with your keyword), posts (appears with it in content), prior (searched before it), after (searched after it), suggestion (offered as your keyword is typed into the search box).
items[].fields.relevancenumberalways nullHow closely it is related to your keyword, from 0 to 1.
items[].fields.search_indexintegerThe related keyword's search index: the platform's own index, not a count of searches. null where the platform gives no figure for the word.
items[].fields.composite_indexintegeralways nullThe related keyword's composite index: the platform's own index of how much attention content about it drew, not a count.
nullFields Xiaohongshu cannot give

Read null as “Xiaohongshu did not give this”, not as zero. These are always null on this call:

  • fields.relevanceHow closely it is related to your keyword, from 0 to 1.
  • fields.composite_indexThe related keyword's composite index: the platform's own index of how much attention content about it drew, not a count.

Every item also has platform, id, ref, approx and type; the response around the items is the same on every call. Response format

Xiaohongshu (RedNote) Pugongying related keywords API: paging and billing.

One call returns the first page only, up to 120 items, with no cursor, for 24 credits.
A call that runs and finds nothing is a successful call: status is "empty", items is empty, and it costs 24 credits.
On this call Xiaohongshu cannot tell a note that does not exist from one with no data: both come back as empty, and both are charged.

5 calls per second per key, 20 after a purchase; going over is not charged. Rate limits

A failed call costs 0 credits and is never retried on its own. Error codes

“Last tested” above is the last day a real call of this interface succeeded. Each call reads from the platform, and fetched_at in the answer is when it was read. The same request sent again with the same key within 5 minutes is a replay (replayed: true): 0 credits, and the answer as first read.

Once connected over MCP, these questions use the Xiaohongshu (RedNote) Pugongying related keywords API.

  1. Get what people search on Xiaohongshu before and after a keyword, from the platform's creator marketplace, each with its place by relevance, its search index, the notes about it and their reads: 面膜.
    call {"op":"xiaohongshu.keyword_related","keyword":"面膜"}
    24 credits

Give this to your AI.
Copy it into Claude or ChatGPT.

How to connect
Prompt
Use the SocialToAI MCP server (https://mcp.socialtoai.com/mcp) for this: Get what people search on Xiaohongshu before and after a keyword, from the platform's creator marketplace, each with its place by relevance, its search index, the notes about it and their reads: 面膜.Call the call tool with {"op":"xiaohongshu.keyword_related","keyword":"面膜"}. Needed: keyword.It gives its first page only, up to 120 items, with no next page; each call costs 24 credits.Before you start, work out how many credits it will take in all and ask me; call it only after I agree.If SocialToAI is not connected yet, tell me how to connect it; never ask me to paste a key into the chat.Answer with a link to every item you used, and tell me how many credits it cost.

Paste it into a chat once SocialToAI is connected over MCP. There is no key in it: Claude and ChatGPT sign in, other clients send a key in a header.

The interface of the same name on other platforms.

All platforms and prices
POST/v1/call/xiaohongshu.keyword_related{ "keyword": "面膜" }24 creditsper call
Douyin trend-index related keywords API2 credits
WeChat Search suggestions API60 credits
Change the op in the path. The response around the items keeps the same shape.

Read next.

Xiaohongshu official API: access, prices and limits

What its own API allows, who can use it and what it costs, with sources.

How to let ChatGPT read Xiaohongshu (RedNote)

connect ChatGPT to Xiaohongshu notes and comments

Let Claude Code and Cursor read Xiaohongshu and Douyin, with no QR code or cookie

connect Claude Code and Cursor to Xiaohongshu and Douyin with no QR code or cookie, and what a self-run server costs you

How brands outside China monitor Xiaohongshu (RedNote), Douyin and Weibo with AI

monitor Xiaohongshu, Douyin and Weibo from outside China with AI, in English, with original links

Xiaohongshu (RedNote) MCP server

Let your AI read Xiaohongshu.

Xiaohongshu (RedNote) Pugongying related keywords API: questions.
Short answers.

All Xiaohongshu data APIs
Do I need a Xiaohongshu account or Xiaohongshu's own API access?
No. You only need a SocialToAI key. The call returns content and account information publicly visible on Xiaohongshu; you never sign in to Xiaohongshu or apply for anything there.
Can I get the next page?
No. On Xiaohongshu this interface gives its first page only (up to 120 items): the response carries no cursor, and page.has_more is always false.
What does one call cost in dollars?
24 credits: $0.08 at 300 credits per dollar (purchases from $10), $0.048 at 500 per dollar (from $200). Credits never expire and there is no subscription. 100 free credits on sign-up, no card.
Am I charged when a call fails or finds nothing?
A failed call costs 0 credits and is never retried on its own. A call that runs and finds nothing is a successful call: status is "empty" and it costs 24 credits. This interface cannot tell a target that does not exist from one with no data, so both are charged as empty.
How much does one call return?
One call returns the first page only, up to 120 items, with no cursor, for 24 credits.
Is there a rate limit?
5 calls a second per key, 20 a second after your first purchase. A request over the limit is told how long to wait and is not charged.
How do I use it from Claude, ChatGPT or Cursor?
Yes. In Claude or ChatGPT, add the MCP address https://mcp.socialtoai.com/mcp as a custom connector, sign in with the code we email you and press Allow; there is no key to paste. In Claude Code, run one command, type /mcp, pick socialtoai and sign in; Codex and Cursor sign in too, with their steps on the connect page. Then ask in plain words and your AI calls call for you.
Start free · 100 credits

Your AI is one URL away
from all of social media.

Start for freeDocs

100 credits on sign-up, no card needed