Marketplace · API · x402

api.spendpreflight.com/v1/preflight

SpendPreflight — trust and verification tools for stablecoin payments, built for AI agents and the people who run them. Payment Preflight: check an x402 challenge or cart against caller spending/sanctions rules and cached evidence. Returns allow/hold/block, reasons and a receipt. Missing/stale evidence stays unknown. No merchant fetch, signing, settlement or custody. Payee binding is a separate check. Allow is not identity verification, safety, compliance certification or proof of paid delivery.

Endpointhttps://api.spendpreflight.com/v1/preflight
Trust✓ Verified callable · 100% uptime over 1 checks · ~1073 ms
PricingPay per call with x402, no account. Call it to get an exact quote before paying.
networkeip155:8453
schemeexact
pay to0xBf4164e07552e4c1b1B1597E72C7acAA3F0a1c58
methodPOST
last updated2026-11-07T11:23:01.352Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.spendpreflight.com/v1/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/x402-8e38cf220057b284

Search the whole marketplace from your agent (MCP)

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