PulseFeed — open-source x402 client tools

Client-side, MIT-licensed tools for PulseFeed — the independent trust & safety layer for the x402 agent-payment economy.

Before an AI agent pays an x402 endpoint, it should know whether that endpoint is safe to pay — ~70% of x402 endpoints are dead, invalid, or scams, and only about half of what catalogs call "healthy" actually work. PulseFeed independently probes every x402 service, scans for scams (payTo hijack, bait-and-switch, honeypot), verifies the receiver on-chain, and publishes an open Trust Score.

This repo holds the open-source client packages. They talk to PulseFeed's public API (free /verify, live /status, paid /trust). The crawler, scoring engine, and dataset are the service itself at pulsefeed.dev.

Packages

Package	What it does	Install
pulsefeed-x402-ai-tools	Drop-in tools for the Vercel AI SDK and LangChain: verify an x402 endpoint before your agent pays + discover working services	npm i pulsefeed-x402-ai-tools
pulsefeed-x402-guard	Wrap your paying fetch — every payment is verified first; dead/scam endpoints are blocked automatically (zero deps)	npm i pulsefeed-x402-guard
pulsefeed-x402-mcp	MCP server: gives Claude Desktop / Cursor / Cline tools to find live x402 services and verify endpoints before paying	npx -y pulsefeed-x402-mcp

Quick example

import { verifyX402Endpoint } from "pulsefeed-x402-ai-tools";

const v = await verifyX402Endpoint("https://api.some-x402-service.com/data");
if (v.verdict === "avoid") throw new Error("don't pay this endpoint");

MCP config

{ "mcpServers": { "pulsefeed": { "command": "npx", "args": ["-y", "pulsefeed-x402-mcp"] } } }

Links

• 🌐 Live observatory: pulsefeed.dev/status — the live state of x402
• 📊 State of x402 report · Trust Score standard · Change feed
• 📖 Methodology · OpenAPI · llms.txt

MIT © PulseFeed