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  1. REST API
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Top momentum

GET /top-momentum
GetTopMomentum

The assets or subjects gaining share of the conversation fastest: this 24 hours' share minus the previous 24 hours'. share_change_pct is the same change relative to yesterday's share.

Share is the fraction of all posts in the same market over the same 24 hours (stocks, crypto, or people and topics), bots excluded; with clusters, it is the share of what those clusters posted.

Parameter rules:

  • asset_class applies only to kind=asset.
  • Posting communities such as wallstreetbets are accepted only for kind=asset with asset_class equity, commodity, or index.

Wallet payment available at https://nebula-api.hiddensystems.ai/api/v1/x402/top-momentum. No Nebula account or API key required; check the payment offer before signing. x402 payment guide.

Parameters

kind string QUERY

What to rank: asset (stocks, commodities, indices, or crypto) or subject (people, accounts, and topics). Defaults to asset.

Allowed values
assetsubject

Default:asset

asset_class string QUERY

With kind=asset, the market to rank: equity (the default), commodity, index, or crypto.

Allowed values
equitycommodityindexcrypto

Default:equity

clusters array<string> QUERY

Author clusters to read; repeat to combine, for example clusters=kols&clusters=media. Selected clusters are added together, and an author can belong to several.

  • Callers: smart_money (best-performing callers), dumb_money (worst-performing), top_degens (best on small-cap crypto)
  • Timing: early_movers (first to talk about an asset as attention rises), late_movers (arrive at the peak or after)
  • Builders: developers, founders, team_leaders, project_accounts
  • Institutions: vcs, asset_managers, dao_guild_funds, incubators, exchanges
  • Influence: kols, celebrities, media, marketer, shiller
  • Analysts: ta_analyst, fa_analyst, macro_analyst, onchain_analyst, investigators
  • Traders: position_trader, swing_trader, day_trader
  • Bias: perma_bull, doomer, tribalist
  • Other: political, nft, bots, automated_ai
  • Communities, by where the post was made: wallstreetbets, reddit

Example:smart_money

limit integer QUERY

Maximum results returned.

Default:25

cURL Example

curl --request GET \
  --url 'https://nebula-api.hiddensystems.ai/api/v1/public/top-momentum' \
  --header 'X-API-Key: YOUR_API_KEY'

Responses

200 OK
400 Bad Request
401 Unauthorized
402 Credits used up; response includes renewal timing and purchased credit balance
403 Forbidden
404 Not Found
405 Method not allowed; the Allow header lists the supported method
429 Too Many Requests
500 Internal Server Error
503 Service Unavailable

Media type application/json

asset_class
string optional

The market whose assets were ranked; absent for subjects.

clusters
array<string> required

The author clusters whose posts were counted, canonicalised; empty when every author except bots was counted.

from
string (date-time) required

UTC start of the ranked 24 hours. The comparison window is the 24 hours before it.

kind
string required

What was ranked: asset or subject, as requested.

Allowed values
assetsubject
previous_total_posts
integer (int64) required

All posts in the ranked population over the previous 24 hours.

results
array<object> required

Ranked results, best first.
results[].asset_class
string optional

The asset's class: equity (stocks and ETFs), commodity, index, or crypto. Send it with asset_id on every asset-scoped request.

Allowed values
equitycommodityindexcrypto
results[].asset_id
string optional

Canonical public asset identifier: the ticker or market symbol for stocks, commodities, and indices, and the CoinGecko slug (or, without one, a numeric id) for crypto.

results[].bearish_posts
integer (int64) required

Posts classified as bearish.

results[].bullish_posts
integer (int64) required

Posts classified as bullish.

results[].kind
string required

What the result is: asset (query it with asset_id and asset_class) or subject (query it with subject_id).

Allowed values
assetsubject
results[].name
string required

Human-readable name.

results[].neutral_posts
integer (int64) required

Posts classified as neutral.

results[].posts
integer (int64) required

This result's posts over the ranked 24 hours.

results[].previous_posts
integer (int64) required

This result's posts in the immediately preceding window of equal length.

results[].price_change_24h_pct
number (double) optional

Raw market-price change over 24 hours, in percentage points.

results[].share
number (double) required

This result's posts as a fraction of all posts in the ranked population over the same 24 hours, from 0 to 1.

results[].share_change
number (double) optional

Change in share against the previous window, as a decimal fraction: 0.01 is one percentage point. Absent only when the population had no posts in the previous window.

results[].share_change_pct
number (double) optional

The change in share relative to the previous window's share, in percent. Absent when the result had no posts in the previous window.

results[].subject_id
string optional

Canonical identifier for a non-asset person, account, or topic.

results[].symbol
string optional

Display ticker or market symbol.

to
string (date-time) required

UTC end of the ranked 24 hours: when the ranking was computed.

total_posts
integer (int64) required

All posts in the ranked population over the 24 hours: the denominator of share.

{
  "asset_class": "equity",
  "clusters": [],
  "from": "2026-08-06T15:00:00Z",
  "kind": "asset",
  "previous_total_posts": 17205,
  "results": [
    {
      "asset_class": "equity",
      "asset_id": "NVDA",
      "bearish_posts": 61,
      "bullish_posts": 214,
      "kind": "asset",
      "name": "NVIDIA Corporation",
      "neutral_posts": 111,
      "posts": 386,
      "previous_posts": 273,
      "price_change_24h_pct": -2.48,
      "share": 0.025255,
      "share_change": 0.009388,
      "share_change_pct": 59.16,
      "symbol": "NVDA"
    },
    {
      "asset_class": "equity",
      "asset_id": "AMZN",
      "bearish_posts": 30,
      "bullish_posts": 92,
      "kind": "asset",
      "name": "Amazon.com, Inc.",
      "neutral_posts": 63,
      "posts": 185,
      "previous_posts": 165,
      "price_change_24h_pct": -0.32,
      "share": 0.012104,
      "share_change": 0.002516,
      "share_change_pct": 26.24,
      "symbol": "AMZN"
    }
  ],
  "to": "2026-08-07T15:00:00Z",
  "total_posts": 15284
}