Base Tx Preflight MCP Server

by madebydevx-preflight Your server? Claim it

answering

Base Tx Preflight is answering right now. Last checked 4 min ago. It exposes 2 tools.

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

Uptime history 34 hours of history

34 hours agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

132 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Base Tx Preflight every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add preflight --transport http https://preflight.madebydevx.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://preflight.madebydevx.com/mcp

~/.codex/config.toml

[mcp_servers.preflight]
url = "https://preflight.madebydevx.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "preflight": {
      "url": "https://preflight.madebydevx.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "preflight": {
      "type": "http",
      "url": "https://preflight.madebydevx.com/mcp"
    }
  }
}

Available tools 2

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

preflight

preflight_quote

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).

preflight_validate

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

Endpoints

URL	Transport	State	Latency	Checked
https://preflight.madebydevx.com/mcp	streamable-http	answering	85 ms	4 min ago

Alternatives to Base Tx Preflight

same job, measured the same way

SPORE x402 Attestation

by beacon-worker-spore-x402

Signed x402 attestations and bounty-packet preflight checks, paid per call in USDC on Base.

6 tools answering

Base Gas MCP

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Live Base gas, tx cost in USD, 4-chain comparison and gas history. Paid per call in USDC via x402.

137 installs/wk local only

X402check

by x402check

Preflight before paying any x402 tool (ok|caution|avoid + history). 1 free/wallet; then $0.01 Base.

1 663 installs/wk 6 tools answering

verify402

by a32116150-ctrl

Free x402 preflight gate plus paid on-chain truth checks for AI agents.

194 installs/wk local only

AgentReady (Base wallet readiness)

by madebydevx-agentready

Agent-readiness score for a Base wallet: gas, USDC float, activity. Paid x402 report.

2 tools answering

Wren Pre-sign Check

by claudeisgod

Check a tx, EIP-712 payload, text or Base token before your agent signs. Paid per call over x402.

4 tools answering

Chaink9

by chaink9

Token risk checks on BSC, ETH, Base and Arc: trades the token on a fork. Paid in USDC/USDT via x402.

529 installs/wk 15 tools answering

Kraken Signals MCP

by nikoble1926

Kraken crypto signals via x402: free preview + paid USDC-on-Base signals, regime & indicators

65 installs/wk local only

Base Tx Preflight — questions

Answers built from our own checks of this server.

What can Base Tx Preflight do?

It exposes 2 tools, read directly from the server on our last check. Among them: preflight_quote, preflight_validate. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Base Tx Preflight working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 132 ms. The bar chart above shows every period we have measured.

How do I connect Base Tx Preflight?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Base Tx Preflight need an API key?

No. Base Tx Preflight completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Base Tx Preflight?

It answers our handshake in 132 ms on average, which is faster than 87% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.