mekong-x402 — native LangChain / CrewAI tools for the x402 fleet

37 pay-per-call APIs on Base (USDC). No signup, no API key — your wallet is the credential. Free daily trial quota on every endpoint. Fleet: https://api.mekongtradeintel.com/tools/

Install

pip install "mekong-x402[langchain]"   # LangChain tools
pip install "mekong-x402[crewai]"      # CrewAI tools
pip install "mekong-x402[all]"         # both
pip install mekong-x402                # core client only (no frameworks)

Quickstart — LangChain

from mekong_x402.langchain_tools import TaskRouterTool, WebSearchTool, AIVerdictTool

# FREE: ask which endpoint fits, in plain language
print(TaskRouterTool().run(task="Is this token a honeypot?"))

# Paid endpoints: free trial first, then USDC per call
print(WebSearchTool().run(query="Ethereum ETF inflows"))
print(AIVerdictTool().run(query="Is 0xabc... a honeypot?"))

Quickstart — CrewAI

from crewai import Agent, Task, Crew
from mekong_x402.crewai_tools import WebSearchTool, TaskRouterTool

analyst = Agent(
    role="Research Analyst",
    goal="Brief me with live data",
    tools=[TaskRouterTool(), WebSearchTool()],
    backstory="You use pay-per-call tools. No API keys needed.",
)

Available tools

Same 7 tools exist in both mekong_x402.langchain_tools and mekong_x402.crewai_tools.

How payment works

1. Call without payment → free trial quota applies automatically.
2. Trial exhausted → the tool raises X402PaymentRequired (never a silent charge). The exception message carries the exact price, payTo, USDC contract, network, and the 3-step x402 flow: sign an exact-scheme USDC transfer on Base → base64 the payload → retry with the X-PAYMENT header.
3. Libraries that automate it: x402-axios / x402-fetch (npm).

from mekong_x402 import X402PaymentRequired
try:
    WebSearchTool().run(query="...")
except X402PaymentRequired as e:
    print(e)  # exact pay instructions for the operator

Verify independently any time: https://api.mekongtradeintel.com/tools/verify