TL;DR — which to pick
Pick Exploding Topics if you're a human researcher, marketer, or analyst doing strategic trend identification for product roadmaps, content planning, or investment theses.
Pick ReelsBuilder if you're an agent or automation pipeline that wants "what's trending right now" on the same API key it uses to render and post videos.
Different shapes of trend data
Exploding Topics' core value is identifying topics before they go mainstream, with a curated, historical database.
ReelsBuilder's GET /api/v1/trending returns current X trending topics from a periodically refreshed cache (name, volume, category, score, location, sync time), filterable by location (woeid) and category. It is free. The richer ranked-trend and breaking-news endpoints are not available yet.
Feature comparison
| Capability | Exploding Topics | ReelsBuilder |
|---|---|---|
| Trending topic feed | ✅ Curated | ✅ Current X trends, cached and refreshed periodically |
| Multi-year historical data | ✅ 5+ years | ❌ |
| Topic discovery (pre-mainstream) | ✅ Core competency | ❌ Already-trending topics only |
| Score per topic | ⚠️ Growth metrics | ✅ score field |
| Breaking-news flags, per-platform scoring | ❌ | ❌ Not available yet |
| Geo filtering | ✅ Country-level | ✅ woeid location id |
| Category filtering | ✅ Many categories | ✅ category filter |
| Public REST API | ✅ Pro tier and above | ✅ Free read on any API key |
| Proven hooks for a topic | ❌ | ✅ GET /api/v1/x-hooks (free) |
| Video generation on the same API | ❌ | ✅ /generate-and-post (a separate, paid call) |
Pricing comparison
Competitor pricing is best-effort as of 2026-05-15.
| Tier | Exploding Topics | ReelsBuilder |
|---|---|---|
| Entry | $39/mo Lite | Free sandbox or live API key |
| API access | ~$99/mo Pro | Included |
| Per-call cost | Bundled | Free (/trending and /x-hooks), within the 60 requests/minute read limit |
Where Exploding Topics wins
- Pre-mainstream discovery. Their entire competitive advantage is finding topics before they peak.
- Multi-year historical context. See if a trend is cyclical, secular, or one-time.
- Human-curated quality and breadth. Many sources and categories; ours is a single trending-topics feed.
- Dashboard for non-engineers. Built for researchers and marketers; ours is built for API integration.
Where ReelsBuilder wins
- Free and on the same key. Trend and hook reads cost nothing and sit next to the render and post endpoints.
- Composable with generation. Trend →
/x-hooks→/generate-and-post→POST /post, all on one API.
When to use both
Exploding Topics for strategic decisions ("what category should we build a content pillar around?"), ReelsBuilder for the daily tactical step ("what's trending right now — render a video about it").
See also
- Signals API —
/trendingand/x-hooks - Stock Video API — turn a trend into a video
- All comparisons