Proof-of-Model: AI Model Substitution Detector

x402

Proof-of-Model: AI Model Substitution Detector is a paid API for AI agents from linked-aimed-reproduced-changing.trycloudflare.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-12).

Detects silent model substitution at any OpenAI-compatible inference endpoint by fingerprinting model weights and verifying they haven't changed over time.

Price / call$0.1

Seller volume →—

Success—

StatusUnknown

How this service works

Proof-of-Model: detect silent model substitution at any OpenAI-compatible inference endpoint. mode=fingerprint records what a seller serves today; mode=verify re-probes later and proves whether the weights changed. Deterministic, evidence included, no model used to judge.

Output

Returns a structured attestation object containing: a verdict (weights match or changed), the kind of check performed (fingerprint or verify), the model claim being tested, an array of deterministic comparisons used as evidence, a mean similarity score, and a self-consistency score — all without using another model to judge the result.

Example use cases

Initial model fingerprint baseline

“Run a fingerprint attestation on the inference endpoint at https://api.someprovider.com/v1 so we have a recorded baseline of what model they're serving today — I want to be able to catch it if they ever quietly swap the weights.”

Verify model hasn't changed since last audit

“Re-probe https://api.someprovider.com/v1 in verify mode and compare it against the fingerprint I captured last month — tell me whether the model weights are still the same or if something changed, and include the evidence.”

Catch bait-and-switch before paying for inference

“Before I commit to this new AI API vendor, use verify mode to check that the endpoint at https://api.newvendor.com actually serves the model they claim, using these prior comparisons from my test run: [comparisons array] — I need proof, not just their word.”

Technical details

Endpoint

POSThttps://linked-aimed-reproduced-changing.trycloudflare.com/v1/attest/model?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need deterministic, evidence-backed proof that an OpenAI-compatible inference endpoint is serving the model it claims — particularly before signing SLAs with AI vendors, after vendor infrastructure changes, or for ongoing model integrity monitoring. Unlike model-based evaluation approaches, this endpoint uses no AI judge, making it tamper-resistant and fully auditable.

Side effects

Unreachable or non-OpenAI-compatible target endpoint returns connection error
Insufficient probe responses to compute a statistically reliable fingerprint
Mean similarity score falls in ambiguous range making verdict inconclusive
Target endpoint rate-limits or blocks the probing requests
Payment of 0.1 USDC not confirmed, request rejected
Baseline fingerprint missing when verify mode is requested

Input

Schema · Request body

Field	Type	Description
kind	string
claim	string
verdict	string
comparisons	array
mean_similarity	number
self_consistency_now	number

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