Pricing
People
Free: three calculations a day, no sign-up.
Ledger — $4/mo. Coming soon, not yet on sale. Several accounts in one place, the IRA-vs-401(k) aggregation rule, inherited-IRA 10-year tracking, QCD offsets and a December deadline reminder.
Agents and developers
| Free tier | 3 calls per day per caller |
|---|---|
| After that | $0.01 per call |
| Pay with | MPP (card or stablecoin via Stripe) or x402 (USDC on Base). A 402 response carries both challenges. |
| Endpoints | POST /api/compute · POST /mcp |
Machine-readable: pricing.json · openapi.json · agent card