Market note · 18 September 2026
A flat day while one business plan halves
The Agentic Economy Price Index closed the 18 September observation at 100.367, a hair down from a revised 100.372 on 17 September (about −0.005% day-over-day; the public card rounds near flat). Over 30 days the headline is still up +0.21%. Like-for-like coverage eased by two pairs — 7,355, from 7,357. Pulse released 2026-09-18T16:55:51Z (release_id 27, 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 | 100.367 | 7,355 | +0.21% |
| Agents | 100.693 | 1,985 | +0.23% |
| MCPs | 100.428 | 4,013 | +0.21% |
| Infrastructure | 99.534 | 1,203 | +0.10% |
| APIs | 101.81 | 211 | +1.65% |
| Platforms | 98.995 | 930 | −0.10% |
| Frameworks | 98.774 | 62 | −1.91% |
| Skills & plugins | 98.376 | 32 | +2.71% |
APIs remain the strongest 30-day riser in this release set. Frameworks stay soft on a thin cohort (62 pairs). Platforms are still slightly underwater on 30 days.
What published
Published genuine repricings for the day (held = 0; four currency-only moves filtered). Eight published:
- stablecoin_freeze_tracker Business (team_sme): $699 → $349.50/mo (−50.0%)
- chatzy_ai Starter (individual): $49 → $69/mo (+40.8%)
- mcpanalytics_mcp_analytics Business (team_sme): $449 → $400/mo (−10.9%)
- mcpanalytics_mcp_analytics Academic (individual): $19 → $20/mo (+5.3%)
- edgee Team (team_sme): €29 → €30 per developer / month (+3.4% in USD terms)
- sellermate_mcp Unlimited (pro): $149 → $150/mo (+0.7%)
- openhuman_2 Basic (individual): $19.99 → $20/mo (+0.1%)
- openhuman_2 Pro (pro): $199.99 → $200/mo (+0.0%)
The standout cut is a business plan cut in half; the standout rise is a starter plan up about two-fifths. Penny-rounding moves on OpenHuman barely register. Net still a flat headline: one loud card does not make a loud index.
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.