Which models existed, at what price, provably.
Model lineups change weekly. Names appear, prices move, context windows grow, and deprecated entries vanish without a trace. When a bill, a budget review or a vendor dispute asks "what did the registry say on that date," yesterday's state is normally unprovable. This page issues a signed, independently re-verifiable receipt of what the public model registry reports for a given model right now: its listed identity, its input and output price, and its context window. Every reading is signed at the moment and archived, so "what did the registry say on date T" has an answer with a receipt.
A signed receipt for a model, right now.
Enter a model id and optionally a provider. Dynamic Feed checks the live public registry for that model, records its listed price and context window, and returns one Ed25519-signed Decision Receipt produced by /v1/answer. Nothing is mocked and nothing is stored about you.
full signed receipt (JSON)
The model market has no memory.
Teams budget against per-token prices, sign contracts that reference specific models, and reconcile invoices weeks after the calls were made. Providers can change lineups and terms at any time, and old registry states are not preserved anywhere you can point to. A contemporaneous record from an independent witness, signed at the moment, carrying its source and observation time, and verifiable years later against a published key, is what turns "the price was different back then" from a recollection into a checkable record. Our records work against us just as well as they work for you: anyone can re-check them, including the other side.
Evidence, not a price list.
Dynamic Feed is a neutral witness, not a marketplace, certifier or adviser. This receipt is a record of what the public registry reported at a moment, not pricing advice, not an endorsement of any model or provider, and not a statement of what a provider will actually bill you; providers change lineups, prices and terms at any time, so check your own agreement. The registry is a community-maintained public source and may itself lag or differ from a provider's official page. Advisory evidence, tamper-evident not tamper-proof, zero personal data, and not legal advice.
One API call per model decision.
Routers, gateways and budgeting tools can mint a signed registry receipt every time a model is selected or a price is assumed, keyless to try, self-serve to scale.