Base Tx Preflight

com.madebydevx.preflightPublished by preflight.madebydevx.comOfficial publisherv1.0.0Updated Nov 6, 2026

Simulate a Base tx before signing: revert reason, gas limit, full fee in ETH/USD. Paid x402.

VerifiedStreamable HTTPWeb executableFinanceDeveloper Tools

Overview

AI-generated overview

Remote MCP server that lets an assistant validate and price a Base transaction preflight before signing, with the full simulation report paid via x402.

What you can do
  • Validate transaction input: check from, to, data and value formatting and whether the recipient is a contract on Base.
  • Quote a preflight: get the price, payTo address and the exact x402 request needed to buy the report.
  • Buy the report: the full simulation with decoded revert reason, gas limit and total fee in ETH and USD is a paid x402 call.
When to use it
Useful when an assistant helps prepare or review a Base (EVM) transaction and you want a sanity check on the calldata and recipient, plus a simulation and fee estimate, before signing or sending funds.
Requirements
A remote streamable HTTP endpoint; no local package, environment variables or headers are declared. The free tools need no account, but the full preflight report requires an x402 payment of 0.50 USDC on Base, so a funded Base wallet capable of x402 payments is needed.
Before you install
The full simulation report costs 0.50 USDC on Base per call and is paid through x402, so an assistant could spend real funds; confirm the quoted price and payTo before paying. The server returns payment details and a request to submit, and the free tools only check formatting and contract status, not safety of the transaction.

Installation

In SourceWeft

  1. Open Base Tx Preflight in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/com.madebydevx.preflight%2Fpreflight/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "base-tx-preflight": {
      "type": "http",
      "url": "https://preflight.madebydevx.com/mcp"
    }
  }
}

Tools

2

preflight_quote

Quote a Base tx preflight

Free: price, payTo and the exact x402 request to buy a Base transaction preflight (simulation with decoded revert, gas limit, full fee in ETH/USD).

Parameterstorequireddatafromvalue

preflight_validate

Validate tx input

Free: checks from/to/data/value formatting and whether 'to' is a contract on Base, before you pay.

Parameterstorequireddatafromvalue

Version history

1
  1. v1.0.0LatestNov 6, 2026

Score

72% 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 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts

    Publish an icon in the registry entry.

  • Documentation15 pts

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

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.