combinatorics.openverbs.com
Route probed: GET https://combinatorics.openverbs.com/v1/catalan
Category: other · Status: listing listed, probe active · Listing: 0.004 USD, 2 payers / 2 calls (30d, Bazaar) · Listed in: agentic-market, cdp-bazaar
Last probe: 2026-10-23T15:08:29Z (1 h ago) · Recent valid 402: 2/2 · p50 2054 ms
probe-only: no paid test-buys yet. No index until 3 paid buys on 3 different days.
Badge: 
Paid test-buys
None yet.
402 challenge checks (since 2026-10-23T15:08:29Z)
1 valid 402s checked: terms consistent 1, Base USDC offered 1, price matches listing 1 (differs 0), payTo changed vs previous probe 0.
Unpaid probes (newest first, up to 200; raw receipts are kept 7 days, then in the archive)
| Receipt | UTC time | Method | Status | Valid 402 | ms | Listed amount (atomic) | Quoted amount (atomic) | Quoted payTo | Header bytes | Response sha256 | Signed | Route | Checks |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 8ac8a67ceb44a44d66fe | 2026-10-23T15:08:29Z | GET | 402 | yes | 2054 | 4000 | 4000 | 0xb3f4de10… | 1956 | 56819a579565056f | per-receipt | primary | terms ok · Base USDC |
| ecca02ee75442c384609 | 2026-10-23T12:44:02Z | GET | 402 | yes | 194 | 4000 | 4000 | 0xb3f4de10… | 1956 | 938c06252f30ad42 | snapshot | primary |
Other listed routes
https://combinatorics.openverbs.com/v1/catalanThe n-th Catalan number Cₙ = C(2n, n)/(n+1), counting balanced bracketings, binary trees, and many other structures. Requires n ≤ 10000. (cdp-bazaar)https://combinatorics.openverbs.com/v1/combinationsBinomial coefficient nCr = n!/(r!(n-r)!), the number of unordered r-subsets of n. Requires r ≤ n and min(r, n-r) ≤ 10000. (cdp-bazaar)https://combinatorics.openverbs.com/v1/factorialExact factorial n! for 0 ≤ n ≤ 20000, returned as a decimal string with its digit count. (cdp-bazaar)https://combinatorics.openverbs.com/v1/multinomialMultinomial coefficient (k1+k2+…)! / (k1! k2! …) — the number of ways to partition n = Σki items into labelled groups of the given sizes. The sum must be ≤ 2000 (cdp-bazaar)https://combinatorics.openverbs.com/v1/permutationsNumber of ordered arrangements of r items from n, nPr = n!/(n-r)!. Requires r ≤ n and r ≤ 10000. (cdp-bazaar)
Seller? Reply or dispute. Amounts are in the asset's atomic units (USDC: 6 decimals).