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Mostly Right

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Probe-verified · tier 2 · checked 26 Sep 2026

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.

databases and storageMDdatabases-storage

What we tested

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

PROBE-VERIFIEDtier 2 of 3
?Markdown negotiationAccept: text/markdown · unknown
—llms.txt/llms.txt
—API catalogRFC 9727
—MCP server card answers/.well-known/mcp/server-card.json → tools/list

Context

97 sites in the index share the category databases and storage. 12 transactional sites share it.

How we grade

Three tiers. Every listing shows which one it has reached, and when. The rubric.

tier 1
Declared
The site says agents are welcome in its robots.txt. A permission, not a capability.
✓
tier 2
Probe-verified
We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
this site · 26 Sep 2026
tier 3
Behaviourally verified
An agent completed the action end to end — booked, bought, submitted — and it worked.
coming
Own this site?

3 checks did not pass when we last looked: llms.txt, API catalog, MCP server card answers. Each is a small, specific fix; the rubric says exactly what we look for.

Behavioural verification — an agent completing your key actions end to end, with the date published here — opens to a small founding cohort first. Leave an email to be in it.

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PgBeam
Hosted, policy-enforced MCP server providing safe, audited, read-only Postgres access with table allowlists, PII masking, query budgets, kill-switch, and full audit trail for AI agents and humans, compatible with any Postgres without code changes.
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DBHub provides a minimal MCP server for database access, supporting PostgreSQL, MySQL, SQL Server, MariaDB, and SQLite. It enables AI agents to execute SQL queries, explore schemas, and manage multi-database connections with guardrails like read-only mode and row limits.
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IGVF Catalog
Query and visualize genomic data from the IGVF Consortium, including variants, genes, proteins, regulatory elements, and their relationships, with access to REST API and knowledge graph exploration.
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Cecil
Geospatial data acquisition platform offering access to 40+ curated spatial datasets via Python SDK and API, supporting compliance workflows for EUDR, TNFD, CSRD, and SBTN with one contract and integration.
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ChartDB
Database visualization tool supporting multiple databases, schema creation, diagram syncing, and export options including SQL, images, JSON, and DBML. Integrates with Supabase and supports API automation for ER-diagram management.
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Record generated from a live database query. Method: about the index.

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 →