docs(conformance): add Nevermined payment example catalog - #86
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A small conformant ARD catalog under conformance/examples/nevermined/ demonstrating payment signaling on entries: x402 pay-per-call in USDC on Base, off-chain card settlement, and a free agent (payment optional). Passes the official conformance tool with 0 errors. Companion to the entry-level payment-signaling discussion in ards-project#20.
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Why this matters
Payment / monetization signaling on ARD entries is an open question (#20). This adds a small, worked, conformant example so the discussion has something concrete to point at: how a publisher can carry pay-per-call terms on an entry as additive JSON-LD extension terms (§3.4), keeping them filterable (§5.3.1) with no change to the ARD entry model or conformance.
What this adds
conformance/examples/nevermined/nevermined-catalog.json— 3 curated entries:eip155:8453), with a pre-constructacceptshint and aschema:Offerprice mirror.stripe), price / currency / network only.Payment terms use a
pay:extension namespace bound in each entry's@context; the free entry shows the mechanism is opt-in. The scalar terms (pay:protocol/pay:price/pay:currency/pay:network) are the intended filter dimensions;pay:acceptsis an advisory, x402-scoped pre-construct hint (the live402stays authoritative).Conformance
Passes the official tool with strict JSON-Schema checking (
pip install jsonschema), 0 errors / 0 warnings:Notes
pay:vocabulary shape is offered for discussion on Spec proposal: access and monetization signaling in ARD entries #20, not as a normative claim; the example validates regardless, because these are additive extension terms (§3.4,additionalProperties: true)./.well-known/ard.jsoncarrying equivalent terms today (nevermined-io/nvm-monorepo#3079).