{"name":"tryx402","description":"Payment layer for AI agents: hard budget caps, cost ledger, and Stripe fiat billing over the x402 (HTTP 402) protocol. Two payment paths: (1) crypto-native calls with USDC settlement on Base via gateway_call, and (2) fiat proxy calls billed to a hosted Stripe balance via gateway_proxy_call. All paid calls include budget enforcement BEFORE debit, automatic refund on provider failure, idempotency guarantees, and per-session spend tracking. Free discovery tools (gateway_search, gateway_discover, gateway_plan, gateway_reattach_request) let agents find APIs, introspect provider endpoints, estimate costs before spending, and recover wallets by email (OTP-verified). Gateway sessions (gateway_session) create sub-sessions with independent caps — spawn a sub-agent with $0.50 and it literally cannot overspend.","vendor":"ARTAIFACT","vendor_url":"https://www.artaifact.com","homepage":"https://www.tryx402.app","license":"MIT","version":"0.4.0","transport":{"type":"streamable-http","url":"https://www.tryx402.app/api/mcp"}}