MCP server: One MCP server.MCP server: One MCP server.
presign-guard wallet
@fizzl13Run by its publisher: served from their own domain, namespace checked by the registry.MCP server · External
Agent wallet with limits: pays x402/MPP on Base, Solana, Tempo, XRPL and Algorand; phone approval.
Freeno charge per call
Runs on your machine from its package; the steps are below.
What it does
- Reads
- Writes
- High impact
At most: moves money, runs code or commands, deletes data, or sends messages for you.
What it costs
FreeOdel charges nothing per call. The publisher may charge for its own service.
Runs locally over stdio
This server isn't hosted — your MCP client launches it from a package registry. Use one of the commands below, or drop the config into your client (e.g. Claude Desktop).
npmpresign-guard-wallet-mcpv0.16.1
Run
npx -y presign-guard-wallet-mcp
MCP client config
{
"mcpServers": {
"presign-guard-wallet": {
"command": "npx",
"args": [
"-y",
"presign-guard-wallet-mcp"
]
}
}
}x402 examples
Spending limits for AI agents, approved from your phone
Give your agents a wallet without giving them a blank cheque:
- presign-guard-wallet (npm): a viem wallet that checks every signature with presign-guard first (drainers, sanctions, unlimited approvals), keeps to your price per purchase and daily budget, and asks you on Telegram for anything above them.
npm i presign-guard-wallet - fizzl (PyPI): the same checks for Python agents, with ready-made LangChain tools.
pip install fizzl - fizzl-langchain (npm): the same checks as LangChain.js / LangGraph.js tools, with a free quick check to try them without a wallet.
npm i fizzl-langchain - presign-guard-ai-sdk (npm): safety checks as Vercel AI SDK tools. Before signing, before buying a token and before paying an x402 endpoint, the agent checks first.
npm i presign-guard-ai-sdk - presign-guard-agentkit (npm): the same for Coinbase AgentKit agents. Wrap the wallet provider in one line, and every transfer, swap, approval, permit and x402 payment is checked and kept to your limits.
npm i presign-guard-agentkit - presign-guard-solana-agent-kit (npm): the same for Solana Agent Kit agents (SendAI). Wrap the wallet in one line, and every transfer, swap and token action from every plugin is checked (instructions decoded and simulated) and kept to your SOL and USDC limits.
npm i presign-guard-solana-agent-kit - presign-guard-wallet-mcp (npm, MCP server): a wallet with spending limits for Claude, Cursor and any MCP client. The agent can pay x402 APIs and send USDC within your budget, and asks you on Telegram above it.
npx -y presign-guard-wallet-mcp - presign-guard-payer-screen (npm): for sellers. Screens who pays your x402 API against the OFAC SDN sanctions list before the payment settles; a listed payer gets 451 and is never charged. EVM, Solana, Algorand, XRP Ledger, no dependencies.
npm i presign-guard-payer-screen - wallet-server: one budget and one set of rules for all your agents, a live dashboard, approvals on the dashboard, on your phone (installable app) or Telegram, pause one agent or all, an activity log. It never holds keys or funds: agents still sign and pay themselves.
See the dashboard live (demo, example data) →
js
import { guardWallet } from "presign-guard-wallet";
const wallet = guardWallet(walletClient, {
pay, // a fetch that pays x402, or creditKey for prepaid presign-guard checks
server: { url: process.env.WALLET_SERVER_URL, key: process.env.WALLET_SERVER_KEY },
});
// Under your price: signs. Above it: you get a request on the dashboard and on Telegram.
// Red verdict: never signed. Server unreachable: stops instead of signing.
Try it from your phone: Actions → telegram-demo → Run workflow (a pretend agent, a stub wallet, no money moves).
Paid-API examples
Small, open examples of AI agents combining paid APIs with x402: each call is paid per request in USDC, with no accounts or API keys.
| Example | What it does | Services | Cost per run |
|---|---|---|---|
| wallet-mcp | MCP server presign-guard-wallet-mcp: wallet tools for any MCP client (pay x402 APIs, send USDC), every signature checked by presign-guard and kept to spending limits, Telegram or wallet-server approval above them | presign-guard | $0.01 per checked signature (or prepaid credits) |
| fizzl-py | PyPI package fizzl: the four checks for Python agents (requests + x402), plus LangChain tools | presign-guard, x402 Doctor | $0.001 to $0.02 per check (or prepaid credits) |
| fizzl-langchain | npm package fizzl-langchain: the five checks as LangChain.js tools, for LangChain and LangGraph agents | presign-guard, x402 Doctor | $0.001 to $0.02 per check (or prepaid credits) |
| ai-sdk-guard | npm package presign-guard-ai-sdk: four Vercel AI SDK tools (check before signing, token check, wallet approvals, endpoint preflight) | presign-guard, x402 Doctor | $0.001 to $0.02 per check (or prepaid credits) |
| agentkit-guard | npm package presign-guard-agentkit: wraps a Coinbase AgentKit wallet provider so every spending action is checked by presign-guard and kept to spending limits, with Telegram or wallet-server approval above them | presign-guard | $0.01 per checked signature (or prepaid credits) |
| solana-agent-kit-guard | npm package presign-guard-solana-agent-kit: wraps a Solana Agent Kit wallet so every transaction is checked by presign-guard (decoded and simulated) and kept to SOL and USDC limits, with Telegram or wallet-server approval above them | presign-guard | $0.01 per checked transaction (or prepaid credits) |
| guard-wallet | npm package presign-guard-wallet: a viem wallet that asks presign-guard before every signature, keeps to spending limits and asks you on Telegram above them | presign-guard | $0.01 per checked signature (or prepaid credits) |
| crowding-check | Perp funding + CFTC leveraged-fund positioning + the Ichimoku cloud on 4h and 1d, combined into a short read ("crowded long + below the cloud = caution") | Edge Agents, Ichimoku Signal | $0.32 |
| token-check | Before buying, holding or accepting a token: a verdict (go / ask / stop) with reasons and market data, Solana and EVM tokens; pays on Solana or Base | presign-guard | $0.01 |
| payer-screen | npm package presign-guard-payer-screen: for sellers. Express middleware that screens who pays your x402 API against the OFAC SDN list before the payment settles (EVM, Solana, Algorand, XRP Ledger); a listed payer gets 451 and is never charged | presign-guard open list (free) | free |
| safe-fetch | npm package x402-safe-fetch: the safe-pay logic as a drop-in fetch for your own agent (preflight, go / caution / no_go, budget cap, trusted hosts, 10-minute verdict cache) | x402 Doctor + the endpoint | $0.001 + the endpoint |
| safe-pay | Before paying an x402 endpoint it has never used, the agent pays $0.001 for a preflight and pays only on go, within a budget | x402 Doctor + the endpoint | $0.001 + the endpoint |
Each example has a --dry-run that shows the prices without paying. Use a dedicated wallet with a little USDC, keep its key in your environment, and never commit it.
Check your own x402 endpoint for free with x402 Doctor.
These are examples of combining services, not trade advice.
