Digital B2B Services Price Index

Draft methodology (dbsi.v0). List prices from public pages — not CPI, not negotiated deals.

What it measures

An equal-weight geometric mean of each constituent’s entry paid list price in the developer-tools basket, expressed as a monthly equivalent.

Entry price

1. Prefer monthly published prices.
2. Else yearly ÷ 12.
3. Take the lowest positive paid plan after (1)–(2).
4. Contact-sales / free-only names count toward coverage, not the value.

Aggregation

For usable prices p_i: geometric mean exp(mean(ln p_i)). Revisions create a new vintage; old points are not silently overwritten.

Caveats

• Public marketing pages only; currency usually USD as published.
• AI extraction is best-effort; raw snapshot + hash are authoritative.
• Basket changes bump methodology_version.

Schema for extracts: plans.v1. Index id: dbsi-developer-tools.