x402 census · chemeq.openverbs.com · 183378942625 · JSON

POST /v1/stoichiometry

live

Given a reaction and a known amount (moles or grams) of one species, compute the amount of a target species. The equation is balanced automatically.

Verdict: live. The unpaid GET reached a valid 402 (confirmed by the re-probe of 2026-10-01).

Facts from the catalogs

Field Value

URL https://chemeq.openverbs.com/v1/stoichiometry

Method POST

Price $0.004 USDC = 4000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base)

payTo 0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A

Seller chemeq.openverbs.com

Catalogs cdp (row updated 2026-09-06)

Listed since (lower bound) 2026-09-06 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-09-06

CDP quality counters 3 calls and 1 unique payers in 30 days, last call 2026-09-06 (catalog-reported, not verified on chain)

Category (keyword rule) crypto-data

Templated path no

x402Version in catalog 2

Service name / tags Reaction stoichiometry · moles to grams chemistry, compute target species, chemical yield from amount, stoichiometry api, mole mass conversion

Unpaid probe (census of )

Field

Value

Probe

not probed in this build

Latest re-probe

Field Value

Re-probed at 2026-10-01T02:13:18.000Z (cron)

Verdict now live changed from unprobed

HEAD / GET 402 / 402

accepts[0] {"scheme":"exact","network":"eip155:8453","amount":"4000","payTo":"0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":300,"extra":{"name":"USD Coin","version":"2"}}

Live amount equals catalog price yes

Latency 4,343 ms

Error none

On-chain facts for the payTo (public address)

Field Value

Distinct payers 5

Payments 197

USDC volume $1.35

Median payment $0.01

First / last payment 2026-09-09 / 2026-09-30

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A

Declared input and output (extensions.bazaar)

{
 "input": {
  "body": {
   "equation": "example",
   "given": {
    "amount": 1,
    "species": "example",
    "unit": "mol"
   },
   "target": "example",
   "targetUnit": "mol"
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
 }
}

Try it (unpaid: shows the 402)

curl -si -X POST 'https://chemeq.openverbs.com/v1/stoichiometry' -H 'accept: application/json' -H 'content-type: application/json' --data '{}'

The catalog declares POST. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.

Paid checks (x402, USDC on Base)

GET https://bazaar.agentexchange.work/r/183378942625/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"183378942625"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.

Catalog references: agentic.market (CDP Bazaar front end) · this record as JSON · all resources on chemeq.openverbs.com.