Kalshi vs Sphere
Which Finance AI tool is better in 2026?
Kalshi
The first US-regulated prediction market exchange
Sphere
AI-native global tax compliance engine for sales tax, VAT and GST
Side-by-side
Kalshi is the more established option (raised $2.5B); pricing is comparable on both sides.
| Metric | Kalshi | Sphere |
|---|---|---|
| Taglinei | The first US-regulated prediction market exchange | AI-native global tax compliance engine for sales tax, VAT and GST |
| Foundedi | 2018🏆 | 2023 |
| HQi | New York, US | San Francisco, US |
| Employeesi | 201-500🏆 | 11-50 |
| Neuron scorei | 80🏆 | 70 |
| Total fundingi | $2.5B🏆 | $21M |
| Latest roundi | Series F · May 2026 | Series A · Nov 2025 |
| Valuationi | $22B🏆 | — |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✓ | ✗ |
| Free triali | ✓ | ✓ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Free | Free trial |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Kalshi and Sphere.
| Capability | Kalshi | Sphere |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✓ | ✗ |
| Free trial | ✓ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Kalshi
- Has raised more capital ($2.5B vs $21M)
- Higher Neuron score (80 vs 70)
- Offers a free plan
- More mature (2018)
🔵 Strengths of Sphere
- Newer company (2023)
Which should you choose?
Choose Sphere if price matters most — it starts at Free trial, which is friendlier for teams watching burn. Both AI Finance tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Kalshi if you want the most established option — it has raised $2.5B, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
Kalshi vs Sphere — which is better?
It depends on your priority. Kalshi has raised more capital and is the more established option; Sphere has broader feature depth. See the side-by-side table above.
Is Kalshi cheaper than Sphere?
No — Sphere's cheapest paid plan is Free trial, while Kalshi's is Free.
Do Kalshi and Sphere offer free plans?
Kalshi: Yes, has a free plan. Sphere: Free trial only.
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