{"domain":"lingua-x402.fly.dev","count":1,"changes":[{"captured_at":"2026-09-28T19:25:30","card_hash":"ea14fb82583c79bea92ec9107cc64d1ed55f3b389fab1030cbaf3a99ab878786","previous_card_hash":null,"diff":{"skills_added":[{"id":"free-sample-preview","name":"Free sample + schema preview","description":"Points to the free validation surfaces before any payment: GET /sample returns the exact paid output shape (synthetic), GET /openapi.json carries full input/output schemas, GET /pricing.md and GET /llms.txt describe all endpoints and prices.","tags":["sample","openapi","free","pricing","preview"],"inputModes":null,"outputModes":null},{"id":"machine-readable-surfaces","name":"Machine-readable discovery surfaces","description":"Guides agents to this wall's free machine surfaces: /pricing.md, /llms.txt, /openapi.json, /about, /.well-known/x402.json (live 402 accepts), /.well-known/agent-card.json (this card), POST /a2a (A2A v1 JSON-RPC).","tags":["discovery","openapi","x402","a2a","json"],"inputModes":null,"outputModes":null},{"id":"translate-guide","name":"Paid translation guide","description":"Explains how to buy POST /api/translate ($1.00 USDC on eip155:8453): body { text, to (ISO 639-1), from?, context? }; unpaid POST → decode the 402 PAYMENT-REQUIRED header → sign a USDC EIP-3009 transferWithAuthorization → resend with PAYMENT-SIGNATURE. Also covers POST /api/localize ($2.00) and POST /api/batch-translate ($3.00, up to 20 strings).","tags":["translation","localization","languages","x402","usdc"],"inputModes":null,"outputModes":null}],"skills_removed":[],"skills_changed":[],"fields_changed":[{"field":"name","before":null,"after":"Lingua — AI Translation & Localization (RAEN x402)"},{"field":"description","before":null,"after":"Context-aware AI translation between 100+ languages for $1.00 USDC on eip155:8453: $1.00 translates any language pair, $2.00 culturally localizes for a target locale, $3.00 batch-translates up to 20 strings. Pay per call via x402 — no API keys, no subscription. Free surfaces: GET /sample (synthetic output shape), GET /openapi.json, GET /pricing.md, GET /llms.txt, GET /about, GET /health, GET /.well-known/x402.json."},{"field":"version","before":null,"after":"1.0.0"},{"field":"protocolVersion","before":null,"after":"1.0"},{"field":"url","before":null,"after":"https://lingua-x402.fly.dev/a2a"},{"field":"documentationUrl","before":null,"after":"https://lingua-x402.fly.dev/pricing.md"},{"field":"preferredTransport","before":null,"after":"JSONRPC"},{"field":"supportedInterfaces","before":null,"after":[{"url":"https://lingua-x402.fly.dev/a2a","transport":"JSONRPC","protocolBinding":"JSONRPC","protocolVersion":"1.0"}]},{"field":"securitySchemes","before":null,"after":{}},{"field":"security","before":null,"after":[]},{"field":"capabilities","before":null,"after":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false,"extensions":[{"uri":"https://x402.org","description":"x402 v2 payment gating: USDC on eip155:8453, scheme exact, $1.00/$2.00/$3.00 per endpoint, facilitator https://x402-agent-pay.com/facilitator, payTo treasury 0x7861db4efc14a1ed5dd8c96c528a3796560f1393. The live 402 challenge is authoritative.","required":false}]}},{"field":"provider","before":null,"after":{"organization":"Royal Agentic Enterprises","url":"https://lingua-x402.fly.dev"}}],"other_changed":true,"is_empty":false,"human_summary":"added 3 skills · name ∅ → Lingua — AI Translation & Localization ( · description ∅ → Context-aware AI translation between 100 · version ∅ → 1.0.0 · protocolVersion ∅ → 1.0 · url ∅ → https://lingua-x402.fly.dev/a2a · documentationUrl ∅ → https://lingua-x402.fly.dev/pricing.md · preferredTransport ∅ → JSONRPC · supportedInterfaces ∅ → https://lingua-x402.fly.dev/a2a (JSONRPC · securitySchemes ∅ →  · security ∅ → [] · capabilities ∅ → extensions, pushNotifications, stateTran · provider ∅ → Royal Agentic Enterprises"}}]}