sdk-features.md

title	SDK Features
description	Feature parity across TypeScript, Go, and Python SDKs

SDK Features

This page tracks which features are implemented in each SDK (TypeScript, Go, Python v2).

Core

Component	TypeScript	Go	Python
Server	✅	✅	✅
Client	✅	✅	✅
Facilitator	✅	✅	✅

HTTP Framework Integrations

Role	TypeScript	Go	Python
Server	Express, Hono, Next.js, Fastify	Gin, net/http, Echo	FastAPI, Flask
Client	Fetch, Axios	net/http	httpx, requests

Networks

Network	TypeScript	Go	Python
evm (EIP-155)	✅	✅	✅
svm (Solana)	✅	✅	✅
tvm (TON)	✅	❌	✅
avm (Algorand)	✅	❌	❌
stellar	✅	❌	❌
aptos	✅	❌	❌
hedera	✅	❌	❌
keeta	✅	❌	❌
near	✅	❌	❌
ccd (Concordium)	✅	❌	❌
xrpl	✅	❌	❌

Mechanisms

Scheme	Network	assetTransferMethod	TypeScript	Go	Python
exact	evm	eip3009	✅	✅	✅
exact	evm	permit2	✅	✅	✅
exact	svm	-	✅	✅	✅
exact	avm	-	✅	❌	❌
exact	stellar	-	✅	❌	❌
exact	aptos	-	✅	❌	❌
exact	hedera	-	✅	❌	❌
exact	tvm	-	✅	❌	✅
exact	keeta	-	✅	❌	❌
exact	near	-	✅	❌	❌
exact	ccd (Concordium)	sponsored V1	✅	❌	❌
exact	xrpl	sequence	✅	❌	❌
exact	xrpl	ticketSequence	✅	❌	❌
upto	evm	permit2	✅	✅	✅
batch-settlement	evm	eip3009	✅	✅	✅
batch-settlement	evm	permit2	✅	✅	✅

Extensions

Extension	TypeScript	Go	Python
bazaar (server)	✅	✅	✅
bazaar (facilitator client - list)	✅	✅	✅
bazaar (facilitator client - search)	✅	✅	✅
builder-code	✅	✅	✅
sign-in-with-x	✅	✅	✅
payment-identifier	✅	✅	✅
offer-receipt	✅	❌	❌
eip2612-gas-sponsoring	✅	✅	✅
erc20-approval-gas-sponsoring	✅	✅	✅

Client Hooks

Hook	TypeScript	Go	Python
onBeforePaymentCreation	✅	✅	✅
onAfterPaymentCreation	✅	✅	✅
onPaymentCreationFailure	✅	✅	✅
onPaymentResponse	✅	✅	✅
onPaymentRequired (HTTP)	✅	❌	✅

Server Hooks

Hook	TypeScript	Go	Python
onBeforeVerify	✅	✅	✅
onAfterVerify	✅	✅	✅
onVerifyFailure	✅	✅	✅
onBeforeSettle	✅	✅	✅
onAfterSettle	✅	✅	✅
onSettleFailure	✅	✅	✅
onVerifiedPaymentCanceled	✅	✅	✅
onProtectedRequest (HTTP)	✅	✅	✅

Facilitator Hooks

Hook	TypeScript	Go	Python
onBeforeVerify	✅	✅	✅
onAfterVerify	✅	✅	✅
onVerifyFailure	✅	✅	✅
onBeforeSettle	✅	✅	✅
onAfterSettle	✅	✅	✅
onSettleFailure	✅	✅	✅

Extension Hooks

Hook	TypeScript	Go	Python
enrichDeclaration	✅	✅	✅
enrichPaymentRequiredResponse	✅	❌	✅
enrichSettlementResponse	✅	❌	✅

Hook Adapter Features

Feature	TypeScript	Go	Python
Scheme-level lifecycle hook adapters	✅	✅	✅
Extension-level server lifecycle hook adapters	✅	✅	✅
Extension-level server HTTP transport hook adapters	✅	❌	✅
Extension-level client lifecycle hook adapters	✅	❌	✅
Extension-level client HTTP transport hook adapters	✅	❌	✅

MCP (Model Context Protocol)

Feature	TypeScript	Go	Python
MCP server payment wrapper	✅	✅	✅
MCP client (auto-pay tools)	✅	✅	✅
Bazaar discovery for MCP tools	✅	✅	✅

MCP Client Hooks

Hook	TypeScript	Go	Python
onPaymentRequired	✅	❌	❌
onBeforePayment	✅	❌	❌
onAfterPayment	✅	❌	❌

MCP Server Hooks (payment wrapper)

Hook	TypeScript	Go	Python
onBeforeExecution	✅	❌	❌
onAfterExecution	✅	❌	❌
onAfterSettlement	✅	❌	❌

HTTP Server Features

Feature	TypeScript	Go	Python
dynamicPayTo	✅	✅	✅
dynamicPrice	✅	✅	✅
paywall (browser UI)	✅	✅	✅