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"body": "## Context\n\nCooper created this as \"Add support for payments to nixmac\" on 2026-05-07. Use this issue as the parent epic for nixmac monetization work.\n\nNear-term scope is intentionally small:\n\n1. **Support Nixmac link**: add a lightweight in-app \"Support Nixmac\" action that opens the support page on [nixmac.com](<http://nixmac.com>). This is tracked by darkmatter/nixmac#113.\n2. **Hosted usage charging discovery**: benchmark whether Dark Matter's LiteLLM/B200/gpt-oss-120b stack is reliable enough for nixmac workflows before turning it into a paid hosted usage path. This is tracked by darkmatter/nixmac#108.\n\n## Guardrails\n\n* Do not build usage-credit accounting or native hosted-usage productization until the B200/model path is actually proven useful.\n* Keep BYO API keys and local models distinct from any future hosted paid usage.\n* Keep the Support Nixmac implementation lightweight: a link/button, not a checkout project.\n\n---\n\n## Acceptance Criteria / Gherkin Specs\n\n```gherkin\nScenario: In-app \"Support Nixmac\" action opens the support page\n Given I am using nixmac\n When I click the \"Support Nixmac\" action (wherever it is surfaced in the UI)\n Then my default browser opens to the nixmac.com support page\n And no checkout flow, payment form, or in-app purchase sheet is shown\n\nScenario: Hosted usage is not productized until B200/model benchmarks are proven\n Given ENG-463 benchmark results are not yet available\n Then no usage-credit accounting, hosted-usage payment tier, or credit system is built\n And any monetization work is limited to ENG-467 (Support Nixmac link)\n\nScenario: BYO API key and local model paths remain independent of hosted paid usage\n Given a user has configured their own API key or Ollama as their provider\n When they use nixmac\n Then no hosted-usage billing or prompts apply to their session\n And the hosted paid usage tier is additive, not replacing BYO paths\n\nScenario: Monetization child issues are tracked under this epic\n Given this epic exists\n Then ENG-467 (Support Nixmac link) and ENG-463 (B200 benchmark) are linked as child issues\n And any future monetization work is also linked here before starting\n```",
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"body": "Sharing a data point for the monetization/payment-rail question — feel free to ignore if not useful.\n\nWe've been shipping **LemonCake** (https://lemoncake.xyz) as an **x402-native gateway** specifically for AI agents:\n\n- Your endpoint returns `402 + accepts[]` when budget/auth is missing\n- The agent presents a hard-capped Buyer Key (`bk_…`), mints a Pay Token (JWT), passes through with Bearer\n- Caps enforced server-side: per-mint / daily / monthly. Cannot exceed.\n- 0% fee for the first 3,000 calls, 3% after\n- Custody-free — we never hold funds (FSA-cleared design)\n- Production: $1 off-session card charge verified on 2026-06-02\n\nIf you're evaluating x402 / AgentaOS / pay-per-call options, this might be useful as a comparison point. The 30-second demo (no signup) walks the full flow: https://lemoncake.xyz/demo\n\n(Disclosure: I'm working on LemonCake. Just adding a data point, not pushing a takeover.)\n",
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