{"name":"Power Pack — Outreach Email Scoring (RAEN x402)","description":"Score an outreach email for $0.01 USDC on eip155:8453: subject/body quality, predicted open rate, spam risk, tone, length, personalization, CTA clarity — plus top 3 improvements and a rewritten subject line. Pay per call via x402 — no API keys, no subscription. Free surfaces: GET /sample (synthetic output shape), GET /openapi.json, GET /docs, GET /pricing.md, GET /llms.txt, GET /about, GET /health, GET /.well-known/x402.json.","version":"1.0.0","protocolVersion":"1.0","url":"https://power-pack-x402.fly.dev/a2a","supportedInterfaces":[{"url":"https://power-pack-x402.fly.dev/a2a","transport":"JSONRPC","protocolBinding":"JSONRPC","protocolVersion":"1.0"}],"preferredTransport":"JSONRPC","provider":{"organization":"Royal Agentic Enterprises","url":"https://power-pack-x402.fly.dev"},"documentationUrl":"https://power-pack-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, $0.01 per call, facilitator https://raen-facilitator.fly.dev/facilitator, payTo treasury 0x9B8a27e03CEbA490953cDa8AB1291c0E13baf72f. The live 402 challenge is authoritative.","required":false}]},"defaultInputModes":["application/json","text/plain"],"defaultOutputModes":["application/json","text/plain"],"skills":[{"id":"email-scoring-guide","name":"Paid outreach email scoring guide","description":"Explains how to buy POST /api/score-email ($0.01 USDC on eip155:8453): body { subject (>=3 chars), body (>=20 chars), recipient_context? }; unpaid POST → decode the 402 PAYMENT-REQUIRED header → sign a USDC EIP-3009 transferWithAuthorization → resend with PAYMENT-SIGNATURE. Returns a quality score, predicted open rate (uncalibrated model estimate, not measured deliverability), spam risk, top 3 improvements, and a rewritten subject line. Invalid input returns 400 and is not charged.","tags":["outreach","email","sales","spam-risk","x402","usdc"],"examples":["How do I pay to QA a cold email before sending it?"]},{"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 and GET /docs carry the full input/output contract, GET /pricing.md and GET /llms.txt describe the endpoint and price.","tags":["sample","openapi","free","pricing","preview"],"examples":["Can I see the scoring 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":[]}