The Go MPP SDK handles the full Solana HTTP 402 payment flow with zero external dependencies. Pure stdlib: ed25519 signing, base58, JSON-RPC, and compact-u16 transaction encoding. One import, one function call on each side. Go and HTTP 402 Go is the language of infrastructure: APIs, microservices, proxies. If you're building something that receives a lot of requests and needs to monetise them without billing overhead, Go is a natural fit. The Go MPP SDK ( github.com/mpptestkit/mpp-test-sdk-go ) adds Solana-backed HTTP 402 support to any net/http handler with a single middleware call. No wallet libraries. No Solana SDK. No cgo. Pure Go standard library from crypto to JSON-RPC. Installation go get github.com/mpptestkit/mpp-test-sdk-go Enter fullscreen mode Exit fullscreen mode Server package main import ( "encoding/json" "fmt" "net/http" mpp "github.com/mpptestkit/mpp-test-sdk-go" ) func main () { server , err := mpp . CreateTestServer ( & mpp . TestServerConfig { Network : mpp .…