Marketplace · API · x402

verifier.quantumshieldlabs.dev/x402/preflight

Return an advisory ALLOW, DENY, or ESCALATE decision by comparing a bounded action request with authority, constraints, and evidence supplied by the caller. The service does not execute or legally authorize the action, access a wallet, validate identity, or independently observe facts.

Endpoint	`https://verifier.quantumshieldlabs.dev/x402/preflight`
Trust	100% uptime over 1 checks · ~767 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	0x550205ECa42aAE871CFED6BC943fB2cF59F1d057
method	POST
last updated	2026-11-11T12:13:17.046Z

Use it

Call it (an x402 client pays automatically)

curl -i https://verifier.quantumshieldlabs.dev/x402/preflight
# 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-cccffa817f7edfea

Search the whole marketplace from your agent (MCP)

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