presign-guard

by x402fizzlco.huggingface.x402fizzl/presign-guard

Safety checks before an AI agent pays, signs or buys (MCP)

  • Remote endpoint
  • 3 tools
  • MIT

Uptime

Checked  · every day

100%from 4 days of checks

Up without downtime on 4 of 4 days with data.

  • No downtime
  • Degraded
  • Down over 5 minutes
  • No data
  • Not checked yet

Response time

Median 1356 ms, slowest 5% 1979 ms for the handshake and the tool list, over 30 days.

2000 ms1000 ms0

How far each check got

  • Reached the address 100%
  • Completed the handshake 100%
  • Listed its tools 100%

3 tools at the last answer.

Every day
DayResultChecksMedian
3 Nov (today)No downtime11979 ms
2 NovNo downtime1of 11695 ms
1 NovNo downtime1of 11280 ms
31 OctNo downtime21249 ms

A failure counts as down time only when a second check five minutes later fails too. How we check

Connect to the publisher's own endpoint

Run in a terminal:

claude mcp add --transport sse presign-guard https://x402fizzl-presign-guard.hf.space/gradio_api/mcp/sse
For agents: the install prompt

Every step above as one Markdown text, for an assistant installing it for you.

# Install the MCP server presign-guard (`co.huggingface.x402fizzl/presign-guard`)

Its page: https://plug.directory/servers/co.huggingface.x402fizzl/presign-guard

It runs on the publisher's servers; the client connects to its URL.

Use the section for the person's client.

## Claude Desktop

Paste into Settings › Connectors › Add custom connector:

```text
https://x402fizzl-presign-guard.hf.space/gradio_api/mcp/sse
```

## Claude Code

Run in a terminal:

```sh
claude mcp add --transport sse presign-guard https://x402fizzl-presign-guard.hf.space/gradio_api/mcp/sse
```

## Cursor, Devin Desktop, LM Studio, Gemini CLI, oterm, ECA

Merge into the place for the person's client:

- Cursor: ~/.cursor/mcp.json
- Devin Desktop: ~/.config/devin/mcp_config.json
- LM Studio: mcp.json (Program › Install › Edit mcp.json)
- Gemini CLI: ~/.gemini/settings.json
- oterm: config.json in oterm's data folder (~/Library/Application Support/oterm on macOS, ~/.local/share/oterm on Linux, %APPDATA%\oterm on Windows)
- ECA: ~/.config/eca/config.json (global) or .eca/config.json in the project

```json
{
  "mcpServers": {
    "presign-guard": {
      "url": "https://x402fizzl-presign-guard.hf.space/gradio_api/mcp/sse"
    }
  }
}
```

## VS Code

Merge into .vscode/mcp.json:

```json
{
  "servers": {
    "presign-guard": {
      "type": "sse",
      "url": "https://x402fizzl-presign-guard.hf.space/gradio_api/mcp/sse"
    }
  }
}
```

## Zed

This server's endpoint speaks only SSE, which this client's documentation does not list among its transports; use another client for it.

## Cline, AnythingLLM, Augment Code

Merge into the place for the person's client:

- Cline: cline_mcp_settings.json (MCP Servers › Configure › Configure MCP Servers)
- AnythingLLM: anythingllm_mcp_servers.json in the AnythingLLM storage plugins directory
- Augment Code: Augment Settings Panel – MCP section – Import from JSON (VS Code extension)

```json
{
  "mcpServers": {
    "presign-guard": {
      "type": "sse",
      "url": "https://x402fizzl-presign-guard.hf.space/gradio_api/mcp/sse"
    }
  }
}
```

## Continue

Merge into ~/.continue/config.yaml:

```yaml
mcpServers:
  - name: "presign-guard"
    type: sse
    url: "https://x402fizzl-presign-guard.hf.space/gradio_api/mcp/sse"
```

## Goose

This server's endpoint speaks only SSE, which this client's documentation does not list among its transports; use another client for it.

## Codex

This server's endpoint speaks only SSE, which this client's documentation does not list among its transports; use another client for it.

## mcp-client-cli, TUUI, BoltAI, Bob Shell, Kiro, Kiro CLI

This server's endpoint speaks only SSE, which this client's documentation does not list among its transports; use another client for it.

## Agenvoy

This server's endpoint speaks only SSE, which this client's documentation does not list among its transports; use another client for it.

## Amp

Merge into ~/.config/amp/settings.json (user) or .amp/settings.json (workspace):

```json
{
  "amp.mcpServers": {
    "presign-guard": {
      "url": "https://x402fizzl-presign-guard.hf.space/gradio_api/mcp/sse"
    }
  }
}
```

Then restart the client, or reload its MCP servers, and ask it to list the server's tools to confirm it started.

Tools 3

  • presign_guard_presign_quick_check A quick green / orange / red verdict for what your agent is about to sign, before it signs. Covers EVM transactions, token approvals, EIP-712 signatures (Permit, Permit2, orders), EIP-7702 authorizations, plain messages, Solana transactions, XRP Ledger transactions (including Batch, delegation and MPTs) and Algorand transactions. This free version returns the verdict only; the reason codes are in presign-guard's paid check ($0.01 over x402, POST https://presign-guard.fizzl.eu/v1/check), which also signs a receipt.
  • presign_guard_screen_address Is this address on the OFAC SDN list? Screen a counterparty before your agent pays it, signs for it or accepts its funds. Matches the address against every digital currency address on the US Treasury's OFAC SDN list (Bitcoin, Ethereum and EVM chains, Tron, Solana with its USDC and USDT token accounts, and more), from presign-guard's open copy of the list, which it refreshes from the Treasury every 6 hours. A match names the listed entity and its sanctions programs. Free and unlimited.
  • presign_guard_token_quick_verdict A quick green / orange / red verdict and a grade (SAFE, CAUTION, RISKY, AVOID) for a token your agent is about to buy, hold or accept. presign-guard checks mint and freeze authority, honeypots, taxes and transfer fees, liquidity, the token's age, concentrated holders and rug pulls. This free version returns the verdict and grade only; the reasons, a one-line summary and market data are in presign-guard's paid GET /v1/token ($0.01 over x402).

From Hugging Face Spaces. Report a problem