Discover / combinatorics.openverbs.com
combinatorics.openverbs.com
The n-th Catalan number Cₙ = C(2n, n)/(n+1), counting balanced bracketings, binary trees, and many other structures. Requires n ≤ 10000.
combinatorics.openverbs.com is listed as payable by AI agents over X402 on base in USDC. It answered a valid payment challenge when we last probed it at Tue, 08 Sep 2026 05:02:21 GMT.
Endpoint
https://combinatorics.openverbs.com/v1/catalan
Status■ Live
Facilitatorcdp
Listed in
x402-bazaar
First indexedSat, 05 Sep 2026 15:21:44 GMT
Probe history
last 1 probes| When | Result | HTTP | Method | Latency |
|---|---|---|---|---|
| Tue, 08 Sep 2026 05:02:21 | challenge | 402 | http-402 | 169ms |
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