Market note · 17 September 2026
A quiet gain as one accounting suite lifts all three plans
The Agentic Economy Price Index closed the 17 September observation at 100.354, up from 100.317 on 16 September (about +0.037% day-over-day; the public card rounds to +0.04%). Over 30 days the headline is still up +0.21%. Like-for-like coverage eased slightly — 7,357 pairs, from 7,365 the day before. Pulse released 2026-09-17T07:26:00Z (release_id 25, 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.
Agents and MCPs, not one blend
| Scope | Level | Pairs | 30d |
|---|---|---|---|
| All | 100.354 | 7,357 | +0.21% |
| Agents | 100.631 | 1,983 | +0.18% |
| MCPs | 100.447 | 4,024 | +0.25% |
| Infrastructure | 99.502 | 1,199 | +0.09% |
| APIs | 101.794 | 214 | +1.90% |
| Platforms | 98.958 | 924 | −0.17% |
| Frameworks | 98.774 | 61 | −1.91% |
| Skills & plugins | 98.376 | 32 | +2.71% |
APIs remain the strongest 30-day riser in this release set. Frameworks are soft on a thin cohort (61 pairs). Platforms stay underwater on 30 days.
What published
Only published genuine repricings for the day (held / niche-not-indexed / below-movers-bar moves omitted). Counts: 3 published · 14 held.
- puzzle_ai_accounting Starter (individual): $25 → $30/mo (+20.0%)
- puzzle_ai_accounting Core (pro): $60 → $72/mo (+20.0%)
- puzzle_ai_accounting Complete (team_sme): $100 → $120/mo (+20.0%)
One provider lifted all three published plans by the same percentage. Net still only a fractional headline step: coverage and quiet chain maths matter more than any single card.
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.