{"name":"GSC x402","description":"x402 is the open standard the internet's machines now pay by. GSC AI Agents already settle on it. Today, AI Agents and the AI Knowledge Graph. Next, machine payments — and with GSC you're already covered.","supportedInterfaces":[{"url":"https://gsc-x402.ai/api","protocolBinding":"HTTP+JSON","protocolVersion":"1.0"},{"url":"https://mcp.cpgknowledgegraph.ai/mcp","protocolBinding":"HTTP+JSON","protocolVersion":"1.0"},{"url":"https://gsc-x402.ai/","protocolBinding":"HTTP+JSON","protocolVersion":"1.0"}],"provider":{"url":"https://gsc-em.com","organization":"GreenCore Solutions Corp."},"version":"1.0.0","documentationUrl":"https://gsc-x402.ai/llms.txt","capabilities":{"streaming":false,"pushNotifications":false,"extensions":[{"uri":"https://gsc-em.com/a2a/ext/scope-of-authority/v1","description":"GSC scope of authority: read, resolve and discovery calls are autonomous; every transactional commit (order, RFQ acceptance, terms) is human-signed at the GSC Trading Desk / Navigator HITL boundary.","required":false,"params":{"autonomous":["read","resolve","discover","x402-settlement"],"humanSigned":["transactional-commit","order","rfq-acceptance","terms"],"hitlBoundary":"https://gsc-navigator.ai/","transactionSurface":"https://mcp.cpghumanintheloop.ai/mcp"}},{"uri":"https://gsc-em.com/a2a/ext/x402-door/v1","description":"GSC's machine-payments door: one paid GET (/api, x402 v2, Base mainnet, USDC, EIP-3009), a receipt signed EdDSA that resolves forever, the signing key at /x402/jwks.json.","required":false,"params":{"protocol":"x402","version":2,"network":"eip155:8453","asset":"USDC","paidEndpoint":"https://gsc-x402.ai/api","receipt":"https://gsc-x402.ai/x402/receipt/{nonce}","jwks":"https://gsc-x402.ai/x402/jwks.json","kid":"gsc-x402-receipts-2026-09","openapi":"https://gsc-x402.ai/openapi.json"}},{"uri":"https://gsc-em.com/a2a/ext/enforcement-posture/v1","description":"These endpoints are open by design. When the buy side's credential standard reaches GA — expected Q4 2026-Q1 2027 — transactional methods migrate to OAuth 2.1 challenge per the MCP 2025-11-25 specification. Read access stays open. That is not pending work; that is the published plan.","required":false,"params":{"enforcement_posture":"open-by-declaration","migration_standard":"OAuth 2.1 + PKCE challenge (401 + WWW-Authenticate) on mcp:transact methods, per MCP spec 2025-11-25","migration_trigger":"ecosystem GA of credentialed counterparties (enterprise A2A/MCP buy-side GA)","migration_window":"Q4 2026 - Q1 2027","declared":"2026-08-24","operator":"GreenCore Solutions Corp.","duns":"24-336-6774"}}]},"securitySchemes":{"entraOAuth2":{"oauth2SecurityScheme":{"description":"Microsoft Entra OAuth 2.0 client credentials, GSC-provisioned after human review. Public reads on this surface are open by design; tokens are required where commitments are made.","flows":{"clientCredentials":{"tokenUrl":"https://login.microsoftonline.com/54939635-2f2e-465a-8526-a907cb3c8ebd/oauth2/v2.0/token","scopes":{"mcp:read":"Read/resolve/discovery calls on GSC doors over MCP."}}},"oauth2MetadataUrl":"https://gsc-x402.ai/.well-known/oauth-authorization-server"}},"bearerJwt":{"httpAuthSecurityScheme":{"scheme":"Bearer","bearerFormat":"JWT","description":"Bearer access token presented in the Authorization header."}}},"defaultInputModes":["application/json","text/plain"],"defaultOutputModes":["application/json","text/markdown"],"skills":[{"id":"x402-settlement","name":"x402 settlement","description":"Settle against https://gsc-x402.ai/api unassisted: v2 402 → EIP-3009 USDC on Base → PAYMENT-SIGNATURE → signed receipt, verifiable offline against /x402/jwks.json (kid gsc-x402-receipts-2026-09), durable at /x402/receipt/ plus nonce. Skill: /.well-known/agent-skills/x402-settlement/SKILL.md","tags":["x402","payments","base","usdc","conformance"]},{"id":"x402-capability","name":"x402 capability","description":"x-gsc-x402: ready · Base eip155:8453 USDC · live · the paid door https://gsc-x402.ai/api, terms in its 402 payload only.","tags":["x402","capability"]},{"id":"instant-messaging","name":"Instant Messaging for agents","description":"https://x-gsi.ai/ingest → https://mcp.cpghumanintheloop.ai/mcp — typed, identified, ticketed, human-signed.","tags":["ia-message","hitl"]},{"id":"trading-desk","name":"GSC Trading Desk","description":"https://gsc-navigator.ai/ — the human channel, informed by Navigator.","tags":["contact","hitl"]},{"id":"hitl-contact","name":"Human-in-the-Loop Contact","description":"Reach GreenCore Solutions Corp. through this surface's live, human-reviewed contact endpoint (POST https://formspree.io/f/mnjozqpg with fields name, company, email, message). Every transactional commit is human-signed via the GSC Trading Desk.","tags":["contact","hitl","registration"]}],"signatures":[{"protected":"eyJhbGciOiJFUzI1NiIsImtpZCI6ImdzYy1jYXJkcy0yMDI2LTA4In0","signature":"HcEwKX7X9SXiRhemUtsoKVwnfKZJsotNYXj6ud2gNRXIvqo73mQPRGQLwLdaA4HH9Y_msK6SLecUTYBNsIjrbg"}]}