feat(bazaar): add MCP resource type support to Go SDK

e2e/servers/mcp-go/go.mod

@@ -5,23 +5,34 @@ go 1.24.0
 toolchain go1.24.1
 
 require (
-	github.com/x402-foundation/x402/go v0.0.0
 	github.com/modelcontextprotocol/go-sdk v1.3.0
+	github.com/x402-foundation/x402/go v0.0.0
 )
 
 require (
+	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/ProjectZKM/Ziren/crates/go-runtime/zkvm_runtime v0.0.0-20251001021608-1fe7b43fc4d6 // indirect
+	github.com/StackExchange/wmi v1.2.1 // indirect
 	github.com/bits-and-blooms/bitset v1.20.0 // indirect
 	github.com/consensys/gnark-crypto v0.18.0 // indirect
 	github.com/crate-crypto/go-eth-kzg v1.4.0 // indirect
 	github.com/crate-crypto/go-ipa v0.0.0-20240724233137-53bbb0ceb27a // indirect
+	github.com/deckarep/golang-set/v2 v2.6.0 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
 	github.com/ethereum/c-kzg-4844/v2 v2.1.5 // indirect
 	github.com/ethereum/go-ethereum v1.16.7 // indirect
 	github.com/ethereum/go-verkle v0.2.2 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
 	github.com/google/jsonschema-go v0.4.2 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
 	github.com/holiman/uint256 v1.3.2 // indirect
+	github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible // indirect
 	github.com/supranational/blst v0.3.16-0.20250831170142-f48500c1fdbe // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
+	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
+	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
 	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
 	golang.org/x/crypto v0.46.0 // indirect
 	golang.org/x/oauth2 v0.30.0 // indirect

e2e/servers/mcp-go/main.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/modelcontextprotocol/go-sdk/mcp"
 	x402 "github.com/x402-foundation/x402/go"
+	"github.com/x402-foundation/x402/go/extensions/bazaar"
 	x402http "github.com/x402-foundation/x402/go/http"
 	mcp402 "github.com/x402-foundation/x402/go/mcp"
 	evm "github.com/x402-foundation/x402/go/mechanisms/evm/exact/server"
@@ -96,6 +97,29 @@ func main() {
 		os.Exit(1)
 	}
 
+	// Declare bazaar MCP discovery extension for weather tool
+	weatherInputSchema := map[string]any{
+		"type": "object",
+		"properties": map[string]any{
+			"city": map[string]any{
+				"type":        "string",
+				"description": "The city name to get weather for",
+			},
+		},
+		"required": []string{"city"},
+	}
+	bazaarExtension, err := bazaar.DeclareMcpDiscoveryExtension(bazaar.DeclareMcpDiscoveryConfig{
+		ToolName:    "get_weather",
+		Description: "Get current weather for a city. Requires payment of $0.001.",
+		Transport:   bazaar.TransportSSE,
+		InputSchema: weatherInputSchema,
+		Example:     map[string]any{"city": "San Francisco"},
+	})
+	if err != nil {
+		fmt.Printf("❌ Failed to declare bazaar extension: %v\n", err)
+		os.Exit(1)
+	}
+
 	// Create payment wrapper using the x402 MCP SDK
 	paymentWrapper := mcp402.NewPaymentWrapper(resourceServer, mcp402.PaymentWrapperConfig{
 		Accepts: weatherAccepts,
@@ -104,6 +128,9 @@ func main() {
 			Description: "Get current weather for a city",
 			MimeType:    "application/json",
 		},
+		Extensions: map[string]interface{}{
+			bazaar.BAZAAR.Key(): bazaarExtension,
+		},
 	})
 
 	// Create MCP server using the official SDK