# mostlyright.md — databases and storage — 0 of 5

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> Probe-verified (tier 2 of 3). Last checked 2026-09-26. 0 of 5 capability checks passed. 2 unknown.

- host: mostlyright.md
- url: https://mostlyright.md/
- category: databases and storage
- type: business
- country: MD
- language: en

## Probe-verified · tier 2 of 3

Probed live on 2026-09-26 against rubric v1.2. 0 of 5 checks passed. 2 unknown.

- UNKNOWN — Markdown negotiation (`Accept: text/markdown`)
- UNKNOWN — Markdown twin at a predictable URL (`/page.md`)
- FAIL — llms.txt (`/llms.txt`)
- FAIL — API catalog (`RFC 9727`)
- FAIL — MCP server card answers (`/.well-known/mcp/server-card.json → tools/list`)

## Summary

Mostly Right publishes open, machine-readable Apache Parquet datasets including time series, benchmarks, and reference data for analysis and machine learning, accessible via API with free and paid tiers for reading and building datasets.

## Context

97 sites in this index share the category "databases and storage"; 12 are transactional.

## How we grade

- tier 1 — **Declared**: The site says agents are welcome in its robots.txt. A permission, not a capability.
- tier 2 — **Probe-verified** (this site): We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
- tier 3 — **Behaviourally verified**: An agent completed the action end to end — booked, bought, submitted — and it worked.

## About this record

Known Good probes sites live and publishes what was tested and when.
Method: https://knowngood.sh/about.md · Rubric: https://knowngood.sh/benchmark

How we found this site: probe discovery. This site didn't declare agent access — we found it by checking the open web. Everything above was tested the same way, against the same rubric, on the date shown. [How we choose what to check, and how to opt out](https://knowngood.sh/bot)

## Where this sits

- MD: https://knowngood.sh/country/MD
- business: https://knowngood.sh/type/business
- databases and storage: https://knowngood.sh/category/databases-storage
- Browse: https://knowngood.sh/browse
- Rubric: https://knowngood.sh/benchmark