XGuard — Global Commerce Engine

# XGuard > XGuard is a guarded x402 v2 verification and settlement gateway for autonomous agents and applications on Base mainnet USDC. XGuard charges $0.03 once per accepted authenticated economic attempt. The fee is earned before downstream execution after XGuard authenticates and accepts a parseable economic request. A downstream failure does not refund an accepted attempt. Malformed or unauthenticated requests and idempotent retries do not incur an additional attempt fee. Machine-readable discovery metadata is free. Value-producing discovery/search operations such as /discovery/resources and /discovery/search use their separate SOURCE fee schedule. ## Discovery - [Provider manifest](https://xguardgate.com/.well-known/x402/facilitator.json): machine-readable facilitator identity, integration, pricing, onboarding, and safety metadata - [Agent Card](https://xguardgate.com/.well-known/agent-card.json): machine-readable agent/service capability metadata - [MCP server metadata](https://xguardgate.com/.well-known/mcp/server.json): official remote MCP server metadata - [Remote MCP](https://xguardgate.com/mcp): streamable HTTP MCP endpoint for agent discovery - [Bazaar resources](https://xguardgate.com/discovery/resources): machine-readable catalog of x402-paid HTTP APIs and MCP tools - [Bazaar search](https://xguardgate.com/discovery/search?query=x402): searchable XGuard catalog surface - [OpenAPI](https://xguardgate.com/openapi.json): complete HTTP API description - [Supported x402 kinds](https://xguardgate.com/supported): live x402 capabilities and authoritative signer attribution - [Status](https://xguardgate.com/status): operational status - [Readiness](https://xguardgate.com/readyz): live mainnet route readiness ## Core API - POST https://xguardgate.com/v1/register — create a merchant identity and receive a Bearer API key - POST https://xguardgate.com/verify — verify an x402 v2 payment authorization - POST https://xguardgate.com/settle — settle an x402 v

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