x402 census · sellers · combinatorics.openverbs.com · JSON
combinatorics.openverbs.com unverified
combinatorics.openverbs.com lists 5 x402 resources in cdp; 0 answered a valid 402 to an unpaid GET, 0 are dead; prices $0.004 to $0.004; on-chain 5 payers, 197 payments, $1.35 USDC; discovery files: not checked.
Listed resources
5
POST 5
Valid 402
0 / 0
verdict unverified
Dead
0
none
Prices
$0.004–$0.004
median $0.004; networks base
Payers on record
5
197 payments, $1.35 USDC, last 2026-09-30
Sampler share
100.0%
payments from monitor/indexer-shaped wallets
Discovery files on the host
| File | Status | Detail |
|---|---|---|
| /.well-known/x402 | not checked | |
| /openapi.json | not checked | |
| /llms.txt | not checked | |
| /.well-known/agent-card.json | not checked |
On-chain settlement facts (public payTo addresses)
5 distinct paying wallets, 197 payments, $1.35 USDC between 2026-09-09 and 2026-09-30; 100.0% of payments came from sampler-shaped wallets. Source: forensics-2026-09-30; the payTo also receives for 90 other hosts; on-chain totals are per address, not per host.
payTo: 0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A. The same payTo also receives for 90 other hosts: airport.openverbs.com, astro.openverbs.com, bitwise.openverbs.com, braille.openverbs.com, chain.openverbs.com, checkdigit.openverbs.com, checksum.openverbs.com, chem.openverbs.com, chemeq.openverbs.com, color.openverbs.com, creditcard.openverbs.com, crypto.openverbs.com and more; on-chain totals are per address, not per host.
Resources (5)
| Resource | Price | Network | Verdict | Catalogs | Description |
|---|---|---|---|---|---|
| POST /v1/catalan | $0.004 | base | unprobed | cdp | The n-th Catalan number Cₙ = C(2n, n)/(n+1), counting balanced bracketings, binary trees,… |
| POST /v1/multinomial | $0.004 | base | live re-probed 2026-10-01 | cdp | Multinomial coefficient (k1+k2+…)! / (k1! k2! …) — the number of ways to partition n = Σk… |
| POST /v1/combinations | $0.004 | base | live re-probed 2026-10-01 | cdp | Binomial coefficient nCr = n!/(r!(n-r)!), the number of unordered r-subsets of n. Require… |
| POST /v1/permutations | $0.004 | base | live re-probed 2026-10-01 | cdp | Number of ordered arrangements of r items from n, nPr = n!/(n-r)!. Requires r ≤ n and r ≤… |
| POST /v1/factorial | $0.004 | base | live re-probed 2026-10-01 | cdp | Exact factorial n! for 0 ≤ n ≤ 20000, returned as a decimal string with its digit count. |
Counting the latest re-probes of the first 5 resources, 4 answer a valid 402 now. Catalog rows: cdp 5. Listed since at least 2026-09-06; last catalog update 2026-09-14. CDP counters: 16 calls, 6 payer-rows in 30 days (catalog-reported).
Badge
<a href="https://bazaar.agentexchange.work/seller/combinatorics.openverbs.com"><img src="https://bazaar.agentexchange.work/seller/combinatorics.openverbs.com.svg" alt="combinatorics.openverbs.com on the Agent Exchange x402 census: 0 routes live"></a>
Paid report (x402)
GET https://bazaar.agentexchange.work/seller/combinatorics.openverbs.com/report.json re-probes up to 18 of these resources right now, re-fetches the manifest and returns the whole record for $0.05 USDC on Base. Unpaid requests answer 402 with the terms. Pricing.