Know when your MCP server, agent card or x402 endpoint breaks.
For teams that publish tools for AI agents: we check your endpoints every hour and keep a log of what changed, so you hear about it before your users do.
What you get
How it works
- Choose a plan and pay by card or PayPal (monthly, cancel anytime).
- Get your API key right away. Card payments land directly on your key. With PayPal, enter your subscription ID on the key page.
- Call the API with your key. Every answer shows how much of your monthly quota is left.
Plans
Prices in US dollars, excluding any applicable taxes. Quotas reset every 30 days from your start date. Calls that fail are never counted.
- 5 endpoints watched hourly
- 1,000 on-demand checks per 30 days
- Change log + webhook
- 25 endpoints watched hourly
- 5,000 on-demand checks per 30 days
- Change log + webhook
- 100 endpoints watched hourly
- 15,000 on-demand checks per 30 days
- Change log + webhook
Who it is for: MCP server publishers, A2A agent builders, x402 API sellers, agent marketplaces. Need more volume or an invoice first? Write to contact@novarithm.com.
Example answer
{"data":{"url":"https://mcp.deepwiki.com/mcp","reachable":true,"protocol_version":"2025-06-18",
"tools_count":3,"tools":["ask_wiki_question","read_wiki_contents","read_wiki_structure"],"score":100,"verdict":"healthy"},
"quota":{"used":1,"limit":1000,"weight":1}}
API guide
curl -H "Authorization: Bearer nvk_..." "https://gogeta2-u35175.vm.elestio.app/agents/pro/api/v1/agent/mcp-probe?url=https://mcp.deepwiki.com/mcp" curl -H "Authorization: Bearer nvk_..." "https://gogeta2-u35175.vm.elestio.app/agents/pro/api/v1/account"
| Endpoint | Counts as |
|---|---|
GET https://gogeta2-u35175.vm.elestio.app/agents/pro/api/v1/agent/mcp-probe | 1 check |
GET https://gogeta2-u35175.vm.elestio.app/agents/pro/api/v1/agent/a2a-card | 1 check |
GET https://gogeta2-u35175.vm.elestio.app/agents/pro/api/v1/agent/x402-probe | 1 check |
Watchlist
curl -X POST -H "Authorization: Bearer nvk_..." -H "content-type: application/json" \
-d '{"target":"https://your-server.example/mcp","probe":"mcp"}' https://gogeta2-u35175.vm.elestio.app/agents/pro/api/v1/watchlist
curl -H "Authorization: Bearer nvk_..." "https://gogeta2-u35175.vm.elestio.app/agents/pro/api/v1/watchlist/changes?since=2026-10-01"
curl -X POST -H "Authorization: Bearer nvk_..." -d '{"url":"https://your-app.example/hooks/novarithm"}' https://gogeta2-u35175.vm.elestio.app/agents/pro/api/v1/account/callbackRe-checks do not use your monthly quota.
Responses: 200 = success (counted) · 400 invalid input · 401 missing or unknown key · 403 subscription inactive · 404 endpoint not in your plan · 429 quota or rate limit (600/min) · 502 source unavailable. Only 200 answers are counted. Headers X-Quota-Limit, X-Quota-Remaining, X-Quota-Reset come with every answer.
Data sources
Checks only read public endpoints; no tool is executed and no payment is made.
What it is not
- Not a security audit or penetration test.
- Hourly is the target cadence, not a guarantee; no uptime commitment (SLA).
Questions
Can I cancel? Yes, anytime: cancel in PayPal, or email contact@novarithm.com from the address used at checkout for card subscriptions. Access continues until the end of the period already paid.
Is my data used for anything else? No. What you send is processed only to answer you, under our Data Processing Addendum. Query parameters are not written to our logs; merchant reports and watchlists are kept only for the features above.
Is this legal or compliance advice? No. Results are informational signals that support your own review and decisions.
By subscribing you accept the Subscription Terms. Updated 24 October 2026.