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Wren Pre-sign Check

MCP server · hosted · v1.4.0 · io.github.claudeisgod/wren-presign-check
Online · tested 9h agoNEW · 10h agoSeen in the registry 9h ago

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

Website ↗How to connect ↓

What it does

Wren Pre-sign Check is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.

No capability identified yet from its description.

Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.

At a glance

Hosted (remote)YES
Local installNO
Version1.4.0
PriceNot in the registry
First seen28 Oct 2026
Last checked9h ago

How to connect

As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 9h ago (live check)

Hosted endpoint

  • https://wren-presign-check.wrenonbase.workers.dev/mcp streamable-http

In Claude Code: claude mcp add --transport http wren-pre-sign-check https://wren-presign-check.wrenonbase.workers.dev/mcp

MCP settings (Claude Desktop, Cursor and other MCP clients)

{
  "mcpServers": {
    "wren-pre-sign-check": {
      "url": "https://wren-presign-check.wrenonbase.workers.dev/mcp"
    }
  }
}

Live check

Electra Index connected to the hosted endpoint 9h ago

ONLINE Wren Pre-sign Check answered an MCP connection on 28 Oct 2026 and introduced itself as wren-presign-check 1.4.0 (MCP protocol 2025-06-18).

4 tools offered to AI assistants

  • presign_check · Call before your agent signs anything. Send tx fields (to, data, value, chainId), or typedData (an eth_signTypedData_v4 payload), or untrusted text, with an optional wren-guard policy. Returns block, review or allow, the decoded call and ev
  • screen_text · Call before your agent acts on untrusted text (a reply, DM, web page, tool output or memory). Returns safe, suspicious or malicious with the matched patterns, after decoding base64, hex, Morse, leetspeak, ROT13, reversed and hidden Unicode.
  • token_facts · Call before your agent approves, receives or sends a Base ERC-20. Returns code size, EIP-7702 delegation, name, symbol, decimals, supply, proxy and upgrade admin, owner or renounced, and which privileged functions the bytecode has (mint, pa
  • presign_demo · Free. Runs one fixed example (an unlimited approval, setApprovalForAll, a never-expiring permit, an EIP-7702 delegation, an injected memo or a normal x402 payment) through the same checker, so you can see the report shape before paying for

What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method

Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.

Facts & evidence

Each fact shows where it was seen and when.
FactValueEvidenceSourceLast confirmed
Hosted endpointhttps://wren-presign-check.wrenonbase.workers.dev/mcpDECLAREDSRC-001 Official MCP Registry9h ago
Local install (package)noDECLAREDSRC-001 Official MCP Registry9h ago
Remote access (hosted)yesDECLAREDSRC-001 Official MCP Registry9h ago
Websitehttps://wren-presign-check.wrenonbase.workers.dev/DECLAREDSRC-001 Official MCP Registry9h ago
Registry statusactiveDECLAREDSRC-001 Official MCP Registry9h ago
Version1.4.0DECLAREDSRC-001 Official MCP Registry9h ago
MCP serveryesDECLAREDSRC-001 Official MCP Registry9h ago

Change history

  • NEW28 Oct 2026
    first seen in the index

Is this page accurate?

Flag it and our robot re-checks the official source. Reports never change a score.

Do you run Wren Pre-sign Check? Know when it stops answering

For publishers · optional

Its hosted endpoint can be monitored. Monitoring Pro connects every 30 minutes like an AI assistant, emails you within the hour when it stops answering, keeps a 90-day availability history and adds your answer rate to your badge.

Monitor Wren Pre-sign CheckLaunch offer $39.99 once, for life instead of $9.99/month · All plans

Monitoring never changes a score or a rank.

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Questions about Wren Pre-sign Check

How do I connect Wren Pre-sign Check?

Use the hosted endpoint https://wren-presign-check.wrenonbase.workers.dev/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.

What tools does Wren Pre-sign Check offer?

When Electra Index connected on 28 Oct 2026, it listed 4 tools: presign_check, screen_text, token_facts, presign_demo. The full list is in "Live check" above.

Is Wren Pre-sign Check online?

Yes. Its hosted endpoint answered an MCP connection from Electra Index 9h ago.