How to Search Hashtags on X (Twitter), With and Without Code

Yes, you can search hashtags on X. Type the hashtag with its #, such as #buildinpublic, into the X search box and press Enter. Choose Top for the most engaged posts or Latest for the newest. Add operators like since:, lang:, or min_faves: to narrow the results. To collect hashtag posts as data, send the same query to an X search API.

This guide shows the search operators for hashtags, then a Python example that uses the Desearch X API to pull posts and count the hashtags that appear alongside yours.

Search a hashtag on X

1. Open X and click the search box.
2. Type the hashtag, including #, for example #opensource.
3. Press Enter.
4. Select Top for popular posts or Latest for a time-ordered feed.

Searching for opensource without the # also matches posts that use the word without tagging it. Keep the # when you only want tagged posts.

Combine hashtags and filters

Hashtags work with the rest of the X search operators:

until: is not inclusive, so until:2026-09-08 stops at the end of September 7. The full list is in the X query syntax guide.

Search hashtags with the Desearch X API

GET /twitter accepts the same query syntax. Encode # as %23 in a URL:

curl --request GET 'https://api.desearch.ai/twitter?query=%23opensource&sort=Latest&lang=en&count=50' \
  --header "Authorization: $DESEARCH_API_KEY"

The API also has parameters for common filters, so you don't have to write them into the query:

Get an API key from Desearch Console. You don't need an X developer account.

Count the hashtags that appear with yours

Each post returns its hashtags in entities.hashtags. That makes it easy to see which topics travel with a hashtag:

import os
from collections import Counter

import requests

API_KEY = os.environ["DESEARCH_API_KEY"]

def search_hashtag(hashtag, **filters):
    response = requests.get(
        "https://api.desearch.ai/twitter",
        headers={"Authorization": API_KEY},
        params={"query": hashtag, "sort": "Latest", "count": 100, **filters},
    )
    response.raise_for_status()
    return response.json()

posts = search_hashtag("#opensource", lang="en", min_likes=5)

related = Counter()
for post in posts:
    entities = post.get("entities") or {}
    tags = {tag["text"].lower() for tag in entities.get("hashtags") or []}
    related.update(tags - {"opensource"})

print(f"{len(posts)} posts")
for tag, count in related.most_common(10):
    print(f"#{tag}: {count}")

requests encodes the # for you when it's passed in params. To track a hashtag over time, run the search on a schedule with start_date and end_date, and store each post by its id so repeated posts are counted once.

Find trending hashtags

To see what's trending instead of searching a known hashtag, use GET /twitter/trends with a location's WOEID. 23424977 is the United States:

curl --request GET 'https://api.desearch.ai/twitter/trends?woeid=23424977' \
  --header "Authorization: $DESEARCH_API_KEY"

What it costs

X Search is billed at $0.15 per 1,000 posts (reference rate as of 7 May 2026, see pricing). Every billable response reports its exact cost in the X-Desearch-Cost-Usd header.

Frequently asked questions

How do I search two hashtags at once?

Use OR to match either hashtag, such as #ai OR #ml. Put both hashtags side by side, such as #ai #ml, to match only posts that contain both.

How do I find the most popular posts for a hashtag?

Select Top on X, or set sort=Top in the API. For a hard threshold, add min_faves:100 to the query, or min_likes=100 as an API parameter.

How do I search a hashtag for a specific date?

Add since: and until:, for example #launchday since:2026-03-10 until:2026-03-11 for March 10. In the API, use start_date and end_date. For older posts, see how to find old tweets by keyword.