Discover / api.spendpreflight.com

SpendPreflight

□ 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 7 checks
Last checked: 17 Oct, 09:26 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.

1 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

POSThttps://api.spendpreflight.com/v1/preflight$0.02Spend 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.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 1 of 1 listed endpoints.

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.17 Oct 2026

All 7 checks

When (UTC)	Result	HTTP	Response
17 Oct, 09:26 UTC	No challenge detected	405	350ms
16 Oct, 08:13 UTC	No challenge detected	405	300ms
14 Oct, 19:26 UTC	No challenge detected	405	181ms
12 Oct, 22:31 UTC	No challenge detected	405	235ms
11 Oct, 00:15 UTC	No challenge detected	405	192ms
9 Oct, 15:32 UTC	No challenge detected	404	240ms
8 Oct, 12:43 UTC	No challenge detected	404	225ms

Questions

Did our last probe detect a payment challenge?

No. At our last probe on 17 Oct, 09:26 UTC, we detected no payment challenge.

What price is recorded for SpendPreflight?

Its listed price is $0.02.

What payment terms does SpendPreflight 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 SpendPreflight listed?

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

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