Discover / usaref.dev

Usaref - N America reference

□ No challenge detected

Statutory income tax on a taxable-income figure: per-bracket workings, effective + marginal rate

x402
Base
USDC
Data

Listed price: $0.05
Challenge detected: 0 of the last check
Last checked: 14 Oct, 22:06 UTC
In our index since: 14 Oct 2026

Endpoint

curl -i https://usaref.dev/v1/answers/income-tax
# 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/usaref.dev

Recent checks

14 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.14 Oct 2026

All 1 checks

When (UTC)	Result	HTTP	Response
14 Oct, 22:06 UTC	No challenge detected	200	1587ms

Questions

Did our last probe detect a payment challenge?

No. At our last probe on 14 Oct, 22:06 UTC, we detected no payment challenge.

What price is recorded for Usaref - N America reference?

Its listed price is $0.05.

What payment terms does Usaref - N America reference 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 Usaref - N America reference listed?

In x402 Bazaar and x402-list.com. Superstables first indexed it on 14 Oct 2026.

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