preflight_x402_payment
Pay Safe: check before paying an x402 service (free)
FREE. Run this before paying any x402 (HTTP 402) service. Pass the service URL and the PAYMENT-REQUIRED value it sent you (or price_usd and pay_to). Returns GO / CAUTION / STOP with reasons: is the service working, is the price fair (vs its public listing, what our monitor saw, and similar services), is the wallet it asks you to pay safe and the one it normally uses?
urlmethodpay_toprice_usdmax_price_usdpayment_required