Pricing — hard caps, no overage, ever.
Every plan covers both APIs (US Inflation + US National Debt) with a single key, the full history, commercial use and the MCP server. Paid tiers change one thing: your monthly volume.
- Both APIs, every plan
- Full history: 1913 / 1790
- Commercial use included
- MCP server included
- No overage billing, ever
- Cancel anytime (Stripe)
Plans
Pro
- 50,000 requests / month
- 60 requests / minute
- Both APIs, full history
- Cancel anytime
Ultra
- 500,000 requests / month
- 120 requests / minute
- Both APIs, full history
- Cancel anytime
Business
- 5,000,000 requests / month
- 240 requests / minute
- Both APIs, full history
- Cancel anytime
The same APIs are listed on RapidAPI at $9.99 / $29.99 — buying direct is cheaper, same data, same infrastructure.
Side by side
| Feature | Free | Pro | Ultra | Business |
|---|---|---|---|---|
| Price | $0 | $7.99/mo | $24.99/mo | $79/mo |
| Requests / month (hard cap) | 500 | 50,000 | 500,000 | 5,000,000 |
| Rate limit | 10/min | 60/min | 120/min | 240/min |
| US Inflation API (CPI since 1913) | ✓ | ✓ | ✓ | ✓ |
| US National Debt API (since 1790) | ✓ | ✓ | ✓ | ✓ |
| Every endpoint, full history | ✓ | ✓ | ✓ | ✓ |
| Famous prices basket (eggs, gas…) | ✓ | ✓ | ✓ | ✓ |
| MCP server for AI agents | ✓ | ✓ | ✓ | ✓ |
| Commercial use | ✓ | ✓ | ✓ | ✓ |
ETag / 304 caching + RateLimit-* | ✓ | ✓ | ✓ | ✓ |
/v1/usage quota endpoint | ✓ | ✓ | ✓ | ✓ |
| Overage charges | Never | Never | Never | Never |
| Credit card required | No | Stripe | Stripe | Stripe |
| Support | Email — ask about SLA |
What you're paying for is volume, not access: the free tier already includes every endpoint and the complete history of both APIs.
Billing FAQ
What happens when I hit my monthly cap?
Requests over the cap return HTTP 429 (QUOTA_EXCEEDED) with reset
timing in the headers. Nothing is billed on top — there is no overage, ever. Upgrade or wait
for the 1st of the month (UTC).
Can I cancel anytime?
Yes. Subscriptions are managed by Stripe and can be cancelled at any moment; your key keeps working until the end of the paid period.
Do you offer annual billing?
Not yet. If you'd prefer an annual plan with a discount, tell us at support@synergicapis.com — real demand decides what we build next.
How do upgrades work?
Subscribe to the bigger plan and your new key arrives with the higher quota; cancel the old one from the Stripe portal. If anything looks off, email us and we'll sort it out.
Is the free tier really usable?
500 requests/month with responses that cache well (ETag → 304)
covers a dashboard that refreshes on release days with room to spare — and commercial use is
allowed on every plan, free included.