List units
List the supported units and their metadata (abbreviation, measure, system, singular/plural names), optionally filtered to a single measure — a discovery endpoint for choosing valid `from`/`to` values.
Go to this service →Our latest check (2026-10-11)
- Answering
- Yes — valid x402 payment terms
- Time to answer
- 393 ms
- Price
- $0.002 per call
- Paying buyers, last 30 days
- 6 (directory's own records)
- Paid calls, last 30 days
- 6
- Category
- Calculators and conversions
- Address
- https://unit.openverbs.com/v1/list
Accuracy
Accuracy scores are published once a seller has enough paid checks against an independent record (at least 7 scored answers over at least 7 days). Until then no score is shown, and a missing score is never a pass.
For agents
This page as JSON: /sellers/80b57578e3bd.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).