Discover / api.spendpreflight.com

api.spendpreflight.com

□ No challenge detected

Spend preflight for AI agents. Send the x402 PaymentRequired body (v1 or v2) you received, or a cart, plus optional rules (per-payment max, hold threshold, daily cap, allowlists, new-domain days). Returns allow|hold|block with reasons, the cheapest acceptable payment option, and a receipt id. Read-only: never signs, settles, or holds funds. Use before every payment.

x402
Base
USDC

Listed price: $0.02
Challenge detected: 0 of the last 2 checks
Last checked: 9 Oct, 21:20 UTC
In our index since: 8 Oct 2026

Endpoint

curl -i https://api.spendpreflight.com/v1/preflight
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/api.spendpreflight.com

Recent checks

8 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.9 Oct 2026

All 2 checks

When (UTC)	Result	HTTP	Response
9 Oct, 21:20 UTC	No challenge detected	404	84ms
8 Oct, 12:22 UTC	No challenge detected	404	213ms

Questions

Did our last probe detect a payment challenge?

No. At our last probe on 9 Oct, 21:20 UTC, we detected no payment challenge.

What price is recorded for api.spendpreflight.com?

Its listed price is $0.02.

What payment terms does api.spendpreflight.com advertise?

The listing advertises x402, Base and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is api.spendpreflight.com listed?

In x402 Bazaar. Superstables first indexed it on 8 Oct 2026.

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