Marketplace · API · x402

presign-guard.fizzl.eu/v1/check/explain

Is this transaction, approval or signature safe to sign, explained for a person? The same pre-sign verdict as /v1/check (green/orange/red + reason codes) plus a short plain-language explanation in English or Dutch, for an agent to show its user before asking for approval. Bulk: 100 checks for $0.80 via /v1/credits.

Endpoint	`https://presign-guard.fizzl.eu/v1/check/explain`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~444 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	2026-10-28T07:47:03.29Z

Use it

Call it (an x402 client pays automatically)

curl -i https://presign-guard.fizzl.eu/v1/check/explain
# 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/x402-8e8a169b8996f5ad

Search the whole marketplace from your agent (MCP)

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