Marketplace · API · x402

presign-guard.fizzl.eu/v1/check

Is this transaction, token approval or signature safe to sign? Check it before your AI agent or wallet signs it: pre-sign verdict (green/orange/red + reason codes) for EVM and Solana transactions, token approvals and Permit/Permit2/EIP-3009/Seaport signatures. Screens the spender or recipient wallet for OFAC sanctions and scam, phishing or theft reports, and flags unlimited allowances, plain-wallet spenders and risky tokens. Bulk: 100 checks for $0.80 via /v1/credits.

Endpoint	`https://presign-guard.fizzl.eu/v1/check`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~972 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0x6B0F4651eD42893ab58139938175E4a69f175F25
method	POST
last updated	2026-10-29T10:41:22.423Z

Use it

Call it (an x402 client pays automatically)

curl -i https://presign-guard.fizzl.eu/v1/check
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-2a2d81e184caeb91

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}

presign-guard.fizzl.eu/v1/check

Use it

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