Discover / geometry.openverbs.com

Circle

■ Challenge detected

Diameter, circumference and area of a circle from its radius.

Listed price
$0.004
Challenge detected
9 of the last 9 checks
Median response
180 ms
Last checked
16 Oct, 13:59 UTC
In our index since
26 Sept 2026

Endpoint

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

  • POST/rectangle$0.004Area, perimeter and diagonal of a rectangle from its width and height.
  • POST/distance$0.004Euclidean, Manhattan and Chebyshev distance between two 2-D points.
  • POST/triangle$0.004Area (Heron's formula), perimeter and interior angles of a triangle from its three side lengths. Sides that violate the triangle inequality are rejected as a clean 400.
  • POST/circle$0.004Diameter, circumference and area of a circle from its radius.
  • POST/polygon$0.004Area (shoelace formula), perimeter and centroid of a simple polygon given its vertices in order. Vertices are treated as a closed ring (last connects to first).

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

Showing 5 of 5 listed endpoints.

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

Recent checks

30 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 9 checks
When (UTC)ResultHTTPResponse
16 Oct, 13:59 UTCChallenge detected402175ms
15 Oct, 08:20 UTCChallenge detected402180ms
13 Oct, 20:45 UTCChallenge detected402301ms
11 Oct, 12:57 UTCChallenge detected402184ms
10 Oct, 00:46 UTCChallenge detected402179ms
8 Oct, 21:32 UTCChallenge detected402191ms
7 Oct, 21:31 UTCChallenge detected402166ms
6 Oct, 18:37 UTCChallenge detected402184ms
30 Sept, 17:04 UTCChallenge detected402175ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 13:59 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 Circle?

Its listed price is $0.004.

What payment terms does Circle 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 Circle listed?

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

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