{"name":"Lingua — AI Translation & Localization (RAEN x402)","description":"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.","version":"1.0.0","protocolVersion":"1.0","url":"https://lingua-x402.fly.dev/a2a","supportedInterfaces":[{"url":"https://lingua-x402.fly.dev/a2a","transport":"JSONRPC","protocolBinding":"JSONRPC","protocolVersion":"1.0"}],"preferredTransport":"JSONRPC","provider":{"organization":"Royal Agentic Enterprises","url":"https://lingua-x402.fly.dev"},"documentationUrl":"https://lingua-x402.fly.dev/pricing.md","capabilities":{"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}]},"defaultInputModes":["application/json","text/plain"],"defaultOutputModes":["application/json","text/plain"],"skills":[{"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"],"examples":["How do I pay to translate a document into Japanese?"]},{"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"],"examples":["Can I see the translation output shape before paying?"]},{"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"],"examples":["Where is the machine-readable pricing manifest for this service?"]}],"securitySchemes":{},"security":[]}