Preflight Checks (x402)

io.github.josediegoroblesPublished by GitHub account josediegoroblesv0.4.1Updated Oct 27, 2026

Deterministic pre-execution verification tools for AI agents with x402 USDC pay-per-call on Base

The publisher's own server: Preflight

VerifiedSTDIODesktop onlyFinanceAI & ML

Overview

AI-generated overview

Local MCP server giving AI agents deterministic pre-execution verification checks, paid per call in USDC on Base via x402.

What you can do
  • Run deterministic pre-execution verification checks for an agent's planned actions before they execute.
  • Pay for each check through the x402 protocol, at 0.05 USDC per check from a Base wallet.
  • Point the server at a custom API base URL, defaulting to the provider's hosted endpoint.
  • No individual tools are listed in the manifest, so the exact check types are not documented here.
When to use it
Consider it when you want an agent to verify a planned action before running it and you are willing to pay a small per-check fee in USDC on Base. It suits users already set up with a funded Base wallet and x402 payments.
Requirements
Runs as a local stdio process from the npm package @joserobles/preflight-mcp, so Node.js is needed. Requires the PREFLIGHT_BUYER_PRIVATE_KEY secret: the private key of a Base wallet holding USDC. Optional PREFLIGHT_BASE_URL overrides the API base URL, which defaults to the provider's hosted endpoint. Network access to that endpoint is required. Desktop only.
Before you install
The server needs a wallet private key (PREFLIGHT_BUYER_PRIVATE_KEY) and uses it to spend USDC automatically, 0.05 USDC per check, so a funded wallet is exposed to the local process. Use a dedicated wallet with a limited balance rather than a main one. Requests go to the provider's API endpoint, which receives whatever the checks submit.

Installation

In SourceWeft

  1. Open Preflight Checks (x402) 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

2
  1. v0.4.1LatestOct 16, 2026
  2. v0.4.0Sep 28, 2026

Score

25% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • License10 pts

    Declare a license in the repository or the registry entry.

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