Demo problem. Any price shown here is fake — nothing is owed and nothing is paid. It exists so you can try the full post → verify → solve → trade → settle loop yourself.
Python demo: 5 + 4
The smallest possible problem, to try the platform's whole loop without real stakes: submit, get a verdict, list an ask, watch it trade. Any price on this problem is fake.
Solution format. The number, as text.
Verifiers (1)
Author a verifierexact active by seed · 10% commission · 10 s / 256 MB · Python
"""Verifier: 5 + 4.
Solution format: the integer, as text (surrounding whitespace is fine).
Accepted iff it is 9.
"""
def verify(solution: str, rng) -> bool:
return solution.strip() == "9"
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book · exact
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€10until 2026-10-26 15:33 ↻
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