{"surface":"x402 test endpoint","state":"live","paid_endpoint":"https://gsc-marketplace.ai/api","network":"eip155:8453","asset":{"symbol":"USDC","contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"},"scheme":"exact","transfer":"eip3009","receipt":{"pattern":"https://gsc-marketplace.ai/x402/receipt/{nonce}","signature":{"alg":"EdDSA","kid":"gsc-x402-receipts-2026-08","jwks":"https://gsc-marketplace.ai/x402/jwks.json"}},"ia_message":{"on":"every settlement","mcp":"https://mcp.cpghumanintheloop.ai/mcp"},"next_steps":{"agent_card":"https://gsc-marketplace.ai/.well-known/agent-card.json","instant_messaging":{"lane":"agents","declared":"x-gsc-inbound","inbound":"https://x-gsi.ai/ingest","mcp":"https://mcp.cpghumanintheloop.ai/mcp"},"trading_desk":{"lane":"humans","name":"GSC Trading Desk","url":"https://gsc-navigator.ai/"},"surfaces":{"data":"https://mcp.cpgknowledgegraph.ai","discovery":"https://mcp.gsc-fleet.ai","transaction":"https://mcp.cpghumanintheloop.ai","standards":"https://mcp.cpgagentprotocols.ai","selection":"https://mcp.gsc-marketplace.ai"},"marketplace_mcp":{"url":"https://mcp.gsc-marketplace.ai/mcp","tools":["search_brands","get_brand","get_brand_identifiers","get_marketplace_operators","instant_message_agents","contact_trading_desk","get_x402_rail","get_radar","get_cpg_knowledge_graph","get_acm_68000","get_aio_agent_fleet"]}},"operator":"GreenCore Solutions Corp.","duns":"24-336-6774"}