Market note · 21 September 2026
A soft day as coverage climbs and two plans slash hard
The Agentic Economy Price Index closed the 21 September observation at 100.351, down from 100.382 on 20 September (about −0.031% day-over-day; the public card rounds to −0.03%). Over seven days the headline is still up about +0.02%; over 30 days it is up +0.22%. Like-for-like coverage jumped — 7,706 pairs, from 7,515 the day before. Pulse released 2026-09-21T16:38:42Z (release_id 41, aepi-ledger-v1). Data by Agentery; free series live at aepi.ai.
Keep the scale honest: this is a market whose headline barely moves. Most listings never reprice on a given day, which is why small chained moves and the occasional large published reprice are the useful read. Agentery’s continuity log marks today’s priced-observation chain as not intact (some listings went blank after a priced run); that thins like-for-like pairing for those names even when the printed index still advances.
Agents and MCPs, not one blend
| Scope | Level | Pairs | 30d |
|---|---|---|---|
| All | 100.351 | 7,706 | +0.22% |
| Agents | 100.692 | 2,054 | +0.22% |
| MCPs | 100.377 | 4,209 | +0.24% |
| Infrastructure | 99.557 | 1,271 | +0.12% |
| APIs | 101.808 | 225 | +1.65% |
| Platforms | 98.994 | 981 | −0.10% |
| Frameworks | 99.236 | 65 | −1.45% |
| Skills & plugins | 98.905 | 34 | +0.54% |
Levels and pair counts are from aepi.ai (pulse + index.csv), not a third-party embed. APIs remain the strongest 30-day riser in this release set. Frameworks stay soft on a thin cohort (65 pairs). Platforms are still slightly underwater on 30 days. Skills & plugins printed a same-day lift on a very thin cohort (34 pairs) — low confidence by design.
What published
Published genuine repricings for the day (held = 0; two currency-only moves filtered). Five published:
- threatcluster_mcp Growth (team_sme): $99 → $29/mo (−70.7%)
- threatcluster_mcp Starter (individual): $19.99 → $7.99/mo (−60.0%)
- context_dev_2 Pro (pro): $149 → $99/mo (−33.6%)
- context_dev_2 Developer (individual): $25 → $19/mo (−24.0%)
- launchrepo LaunchRepo (team_sme): €99.98 → €119.98 once (+20.0%)
The standout cuts are two ThreatCluster MCP plans — Growth down about seven-tenths, Starter down three-fifths — plus two Context.dev monthly drops. The only published rise is a one-time LaunchRepo fee up a fifth. Net still a soft headline: loud cards on a handful of plans do not make a loud index when most of the chain is quiet.
Method in one line
AEPI only counts a price change when the same plan from the same provider is observed at a new standing price — live daily at aepi.ai and agentery.com/aepi. Free CSVs and MCP at aepi.ai. Not investment or pricing advice.
Figures from aepi.ai MCP + index.csv for observation day 2026-09-21 (release 41, published 09:38 PT / 16:38 UTC). Separate from the Agent Costs note drafted the same day.