NeuForge Pay for LangChain (neuforge-langchain)
A LangChain callback handler that natively implements the Bounded Overshoot x402 token metering protocol.
Usage
from neuforge_langchain import NeuForgeCallbackHandler
from langchain_openai import ChatOpenAI
handler = NeuForgeCallbackHandler(daily_budget_usd=5.0)
llm = ChatOpenAI(callbacks=[handler])
# If this generation pushes you over the $5.00 limit, a PaymentRequiredException is thrown!
response = llm.invoke("Write a very long story.")
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