The X (Twitter) Competitor Tracking API

Every metric below comes from raw endpoints, so you define the formula and own the output.

• Follower growth rate: change in follower count between two snapshots, as a percentage. /info-batch
• Engagement rate: likes, reposts, and replies divided by views, or by followers as a proxy, averaged across recent posts. /user-tweets
• Posting frequency: posts per week and their distribution across days and hours. /user-tweets
• Content mix: share of original posts, replies, quotes, and media. /user-tweets
• Share of voice: a competitor's mention volume as a percentage of the whole category, engagement-weighted. /mentions, /search-tweets
• Audience overlap: followers shared between two rivals, as a percentage of each base. /followers
• Verified and fake ratio: share of verified followers and an estimate of inauthentic accounts. /followers, /verified-followers

As a rough anchor, 1 to 3 percent engagement is solid for a brand account, but the only benchmark that matters is the median of three direct rivals in your niche. The competitor analysis guide has niche benchmarks and the engagement calculator does the per-post math with no key.

curl -G "https://api.sorsa.io/v3/info-batch" \
  -H "ApiKey: YOUR_API_KEY" \
  --data-urlencode "usernames=stripe" \
  --data-urlencode "usernames=wise" \
  --data-urlencode "usernames=revolutapp"

{
  "users": [
    {
      "username": "stripe",
      "display_name": "Stripe",
      "followers_count": 1428902,
      "followings_count": 412,
      "tweets_count": 9183,
      "verified": true,
      "created_at": "2011-04-28T22:11:09Z"
    },
    {
      "username": "wise",
      "display_name": "Wise",
      "followers_count": 274613,
      "followings_count": 238,
      "tweets_count": 21470,
      "verified": true,
      "created_at": "2010-09-15T08:34:52Z"
    }
  ]
}

One request returns up to 100 full competitor profiles. Log it on a weekly cron and you have follower-growth deltas with no SaaS subscription and no OAuth.

There is no stream to manage and no surprise bill. Pick the fields you care about, pull them on a schedule (a weekly or daily cron), and store each snapshot. Growth and content metrics fall out of diffing consecutive snapshots; share of voice and mentions you query on demand. Because billing is flat per request, a viral spike or a deep follower pull never changes the cost. For the full cadence and alerting patterns, see the real-time monitoring guide.

• Is a rival's follower spike real growth or inflated by bots?
• How much of competitor A's audience overlaps with competitor B?
• Which post format and cadence drives their engagement?
• Did a competitor quietly launch or reposition before announcing it?
• Are we gaining or losing share of voice in the category this quarter?

Not sure which plan fits? Every account starts with 100 free requests: up to 10,000 tweets or 20,000 profiles. No card, no expiry, all 40 endpoints.

Weekly tracking of 3 to 5 competitors fits the Starter plan; deep audience extraction scales onto Pro or Growth. High-volume plans cover 1M to 10M requests a month; for custom terms, contacts@sorsa.io.