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Chemical equations

■ Challenge detected

Given a reaction and the supplied amount of every reactant, identify the limiting reagent and compute leftover reactant and theoretical product yields.

Listed price
$0.004
Challenge detected
10 of the last 10 checks
Median response
189 ms
Last checked
17 Oct, 09:26 UTC
In our index since
26 Sept 2026

Endpoint

curl -i https://chemeq.openverbs.com/v1/limiting
# 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://chemeq.openverbs.com/v1

  • POST/balance$0.004Balance an equation such as "H2 + O2 -> H2O" into the smallest whole-number coefficients using exact rational linear algebra. Equations that cannot be balanced with positive coefficients are clean 400s.
  • POST/stoichiometry$0.004Given a reaction and a known amount (moles or grams) of one species, compute the amount of a target species. The equation is balanced automatically.
  • POST/limiting$0.004Given a reaction and the supplied amount of every reactant, identify the limiting reagent and compute leftover reactant and theoretical product yields.

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/chemeq.openverbs.com

Recent checks

28 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.17 Oct 2026
All 10 checks
When (UTC)ResultHTTPResponse
17 Oct, 09:26 UTCChallenge detected402525ms
16 Oct, 08:13 UTCChallenge detected402177ms
14 Oct, 23:56 UTCChallenge detected402163ms
13 Oct, 14:18 UTCChallenge detected402176ms
11 Oct, 12:57 UTCChallenge detected402210ms
10 Oct, 03:32 UTCChallenge detected402196ms
8 Oct, 21:32 UTCChallenge detected402183ms
7 Oct, 15:42 UTCChallenge detected402175ms
6 Oct, 15:31 UTCChallenge detected402216ms
28 Sept, 17:02 UTCChallenge detected402194ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 17 Oct, 09:26 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 Chemical equations?

Its listed price is $0.004.

What payment terms does Chemical equations 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 Chemical equations listed?

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

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