Discover / 4yearcycle.com

ECB FX Rates

■ Challenge detected

Official daily foreign exchange reference rates from the European Central Bank (~30 currencies vs EUR, published each business day around 16:00 CET), rebased on request to any listed currency via EUR cross-rates and filtered to a requested symbol list; returns the reference date, the rate table and the ECB source attribution.

x402
Base
USDC

Listed price: $0.005
Challenge detected: 10 of the last 10 checks
Median response: 464 ms
Last checked: 16 Oct, 23:40 UTC
In our index since: 26 Sept 2026

Endpoint

curl -i https://4yearcycle.com/x402/fx-rates
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

3 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.

Base URLhttps://4yearcycle.com/x402

GET/fx-rates$0.005Official daily foreign exchange reference rates from the European Central Bank (~30 currencies vs EUR, published each business day around 16:00 CET), rebased on request to any listed currency via EUR cross-rates and filtered to a requested symbol list; returns the reference date, the rate table and the ECB source attribution.
GET/web-search$0.01General web search reselling the Tavily Search API: query the live web and get back ranked results (title, URL, snippet, relevance score) plus an optional short synthesized answer, with basic or advanced search depth and optional domain include/exclude filters.
GET/tenders$0.01EU public procurement tender notices from the official TED (Tenders Electronic Daily) v3 API, filtered by CPV product/service code, country of performance and free-text keywords over a recent publication window; returns structured JSON per notice with title, buyer, deadline, publication date, CPV codes, notice URL and German PDF link.

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

Showing 3 of 3 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/4yearcycle.com

Recent checks

26 Sept 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.16 Oct 2026

All 10 checks

When (UTC)	Result	HTTP	Response
16 Oct, 23:40 UTC	Challenge detected	402	538ms
15 Oct, 19:10 UTC	Challenge detected	402	484ms
14 Oct, 14:31 UTC	Challenge detected	402	345ms
12 Oct, 10:53 UTC	Challenge detected	402	448ms
10 Oct, 21:52 UTC	Challenge detected	402	462ms
9 Oct, 15:32 UTC	Challenge detected	402	474ms
8 Oct, 15:35 UTC	Challenge detected	402	457ms
7 Oct, 09:33 UTC	Challenge detected	402	466ms
6 Oct, 09:33 UTC	Challenge detected	402	630ms
26 Sept, 17:02 UTC	Challenge detected	402	451ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 23:40 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for ECB FX Rates?

Its listed price is $0.005.

What payment terms does ECB FX Rates 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 ECB FX Rates listed?

In x402 Bazaar. Superstables first indexed it on 26 Sept 2026.

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