x402-market

io.github.AsaiShotaPublished by GitHub account AsaiShotav0.2.0-alpha.1Updated Oct 24, 2026

Let AI agents pay-per-call for any HTTP API via x402 on Base mainnet. One tool: pay_and_call.

VerifiedSTDIODesktop onlyFinanceDeveloper Tools

Overview

AI-generated overview

Lets an AI assistant pay per call in USDC via x402 on Base to invoke HTTP APIs listed in a marketplace, using a funded buyer wallet.

What you can do
  • Pay for and call HTTP APIs listed in the x402 marketplace, settling each call in USDC on Base.
  • Read-only marketplace tools work without a wallet key, so listings can be browsed before paying.
  • Enforce a per-call spending cap through MCP_MAX_PRICE, refusing calls priced above it.
  • Point at Base mainnet or Base Sepolia testnet and a custom RPC or marketplace API endpoint.
When to use it
Useful when an assistant needs to call paid HTTP APIs that accept x402 payments on Base and you are willing to fund a dedicated buyer wallet. Not needed for free APIs or for browsing the marketplace without paying.
Requirements
Runs locally over stdio from the npm package, so Node.js is required. Needs a funded Base wallet private key in MCP_BUYER_PRIVATE_KEY for paid calls, plus a Base RPC endpoint (BASE_RPC_URL, public default) and network access. BASE_CHAIN_ID selects mainnet (8453, default) or Sepolia (84532); MARKET_API_URL sets the marketplace API base.
Before you install
The server holds a private key for a funded wallet in MCP_BUYER_PRIVATE_KEY, so any compromise means lost funds; use a dedicated low-balance wallet. Every pay_and_call spends real USDC on Base mainnet by default, and the MCP_MAX_PRICE cap is the main safeguard against overspending. Requests and payments go to third-party marketplace APIs and RPC providers.

Installation

In SourceWeft

  1. Open x402-market in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

This repository has no README.

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v0.2.0-alpha.1LatestSep 16, 2026

Score

25% of the applicable checks met

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  • Reached in the last 30 days25 pts

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  • Auth declared10 pts

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  • Tools listed15 pts

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  • DescriptionRequired15 pts
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  • License10 pts

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