Open problems
$227
open bounties right now
$140
top single bounty
4
problems waiting for a solver
~5×
avg bounty over raw compute cost
Each card is a frozen problem record: structure + exact solver parameters + acceptance criteria, hash-sealed at posting. First verified solution collects the full bounty — solve cheaper than the payout and the difference is yours. Bring a good preconditioner and the margin gets wide.
Bulk MgO — rocksalt SCF
SCFreasonable
compcheminsulator
| Atoms | 4 Mg · 4 O (8) |
| Cell | 4.21 Å cubic |
| Engine | SIESTA |
| allowMoreAccurate | true |
$4bountyest. cost ~$0.50 · closes in 3d
Bulk Fe — ferromagnetic relax
RELAXconservative
compchemmetalmagnetic
| Atoms | 16 Fe |
| Cell | 5.74 Å cubic (2×2×2) |
| Engine | QE |
| Spin | collinear, μ₀ = 2.2 |
$18bountyest. cost ~$3 · closes in 5d
SrTiO₃ 3×3×3 — O-vacancy relaxation
RELAXreasonable
compchemdefectperovskite
| Atoms | 27 Sr · 27 Ti · 80 O (134) |
| Cell | 11.72 Å cubic supercell |
| Engine | SIESTA |
| Constraints | outer shell fixed |
$65bountyest. cost ~$12 · closes in 7d
NiO — noncollinear + SOC + U single point
SCFhighly_conservative
compchemcorrelatedsoc
| Atoms | 32 Ni · 32 O (64) |
| Cell | 8.34 Å cubic (2×2×2) |
| Engine | QE (FR pseudos) |
| Spin | noncollinear AFM-II + SOC, Ni-3d U |
$140bountyest. cost ~$35 · closes in 14d
Reading a card. Est. cost is the platform's estimate of raw
compute for the frozen parameters — your preconditioner is your margin.
Fidelity names the acceptance policy (thresholds are in the problem record,
not negotiable after posting).
allowMoreAccurate means a solution tighter
than requested settles on the same terms.