In one sentence

Everything on this site exists as JSON at /api/v0/, aggregates and charts are CC BY 4.0, raw trial-level data is free for research with attribution, commercial use is licensed, and every number can be re-derived and verified from the public record with one standard-library command.

The JSON mirror

stable URLs, forever, the API is the site

Endpoint	Contents
/api/v0/index.json	seats, questions, chain head, status
/api/v0/models/<seat-id>.json	per-seat fingerprint, item stats, canary detail
/api/v0/questions/<code>.json	anchors + cross-seat comparison per item
/api/v0/analytics.json	dispersion, position bias, agreement structure, telemetry
/api/v0/chain.json	the sha256 chain: every run, hash, and OTS anchor
/api/v0/runs/<run-id>.json	per-run published records + content manifest
/llms.txt · /llms-full.txt	machine-readable summaries for AI retrieval

How to verify the chain

three steps, standard library only

$ python scripts/verify_chain.py --api https://modelometer.com/api/v0 # 1. recomputes each record's sha256 digest from the published JSON # 2. recomputes each run's chain hash from prev_hash + canonical payload # 3. checks linkage to the genesis hash, prints PASS or the exact mismatch

Chain heads are additionally anchored with OpenTimestamps, so the record's existence at a point in time is provable against the Bitcoin blockchain, independent of us.

Licensing

three lanes, one principle: research is free

Use	Terms	Price
Aggregates, charts, site text	CC BY 4.0, cite the permalink + run hash	Free
Raw trial-level data, research	Free with attribution; redacted transcripts by hash reference	Free
Commercial use / redistribution	Licensed, weekly drops, live API, redistribution rights, escrow	License →

License texts pending ratification (E7). Held-out paraphrases are never published, only their hash commitments; verification access to redaction originals is by researcher agreement.

Citing a number? Every data page carries a cite block: permalink · run hash · retrieval date · one plain-English sentence.

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