ProbegradeMeasured, not bought.
Uptime tells you an API answered. Probegrade tells you whether the answer was right: schema validity, freshness, and agreement with independent reference sources, measured by automated probes.
Verified for data providers: $99/month, 14-day free trial. Public rankings stay free, with no sign-up.
MCP servers100
Geo99
Knowledge99
MCP servers99
Weather99
Reachable isn't the same as right.
Free tools already check whether servers are up. Agents also need to know the data they get back is well-formed, current and accurate, because a wrong answer that arrives fast is worse than an error.
Schema validity
Every probe checks the response against the shape the provider documents, so agents don't break on missing or renamed fields.
Freshness
We compare the timestamp inside the data with the time we asked, and flag sources that serve stale values.
Reference cross-checks (beta)
We compare values with independent references for the same quantity, such as FX rates against ECB reference rates, and publish the deviation.
Uptime and latency
Still measured on every scheduled probe. It's the floor, not the headline.
Sponsorship kept separate
Sponsored placement is labeled and never changes a score or rank. Paying for Verified doesn't either.
Dated and auditable
Each monthly edition is frozen with the hash of the probe archive it came from, so anyone can check it.
Turn your accuracy into proof buyers can check.
Probegrade Verified gives you a dated badge, a public data-quality score and the full probe report for your API, including reference cross-checks. It confirms who runs the source; it never raises your score.
$99/month or $990/year · 14-day free trial · Verified Pro $299/month
Sample reference checks
| Source | Checked against | Result |
|---|---|---|
| ExchangeRate-API (open access) | 5 USD pairs vs. ECB reference rates (via Frankfurter) | max deviation 0.13% across 15 checks |
| CoinGecko Simple Price | BTC and ETH in USD vs. Coinbase spot | max deviation 0.04% across 6 checks |
| Open-Meteo Forecast | Nashville current temperature vs. NWS observation at KBNA | max difference 0.9 °C across 3 checks |
| IPinfo and ipapi.co | Agreement on 3 public anycast resolver IPs, latest snapshot (no ground truth) | country agreed 3/3, city agreed 1/3 |
Beta. 3 snapshots taken 2026-10-17 06:37 to 2026-10-17 06:47 UTC. Reference values can differ for legitimate reasons (update times, averaging, anycast routing), so a deviation is a signal to look closer, not proof of an error. Cross-checks are published next to the score and are not yet part of it.
Free rankings. One gateway when you're ready to pay per call.
Look up scores with no account. When your agents need paid tools, the gateway bills each call with x402 v2 on Base, stays compatible with older v1 agents, and supports “upto” spend caps.
Gateway: $99/month plus per-call charges.
A dated, citable edition every month.
Each edition freezes scores from that month's archived probes, with a hash so anyone can audit it. Verified providers embed a dated badge.
Show agents your data is right.
Verified is open to API and data providers now, with a 14-day free trial. Agent builders can use the rankings free today.