# an API monitoring service

**API monitoring is crowded and real, but the clearest openings are cost/rate-limit monitoring and changelog/usage alerting for specific APIs.**

Confidence: high  ·  125 signals  ·  checked 2026-08-01

[Full report with live links](https://showsitsworks.com/idea/an-api-monitoring-service)

## Who is already building this

*From data*

- openstatusHQ/openstatus is a live competitor with 8,932 stars and a last push on 2026-08-01; it positions itself as status pages plus uptime monitoring and API monitoring as code.
  - [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) `github` — 2023-06-19
- openstatusHQ/openstatus is the biggest named open-source project in this set, with 8,932 stars and active maintenance.
  - [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) `github` — 2023-06-19
- microsoft/Detours has 6,339 stars and was pushed on 2026-07-31; it is for monitoring and instrumenting API calls on Windows.
  - [microsoft/Detours](https://github.com/microsoft/Detours) `github` — 2016-10-19
- router-for-me/Cli-Proxy-API-Management-Center has 3,789 stars, was pushed on 2026-08-01, and focuses on configuration changes and runtime status monitoring for CLI-Proxy-API.
  - [router-for-me/Cli-Proxy-API-Management-Center](https://github.com/router-for-me/Cli-Proxy-API-Management-Center) `github` — 2025-09-06
- Findomain/Findomain has 3,782 stars and was pushed on 2026-07-28; it includes subdomain monitoring, HTTP checks, alerts, and API keys for sources.
  - [Findomain/Findomain](https://github.com/Findomain/Findomain) `github` — 2019-04-14
- Apitally is a real usage signal too: its npm package has 11,347 downloads last month, and the project describes itself as simple API monitoring and analytics for REST APIs.
  - [npm: apitally](https://www.npmjs.com/package/apitally) `registries` — 2026-05-29
- checkcle has 2,803 stars and a last push on 2026-07-17; it is an active self-hosted monitoring platform with uptime monitoring, distributed checks, incident tracking, and alerts.
  - [operacle/checkcle](https://github.com/operacle/checkcle) `github` — 2025-05-09
- Metlo has 1,782 stars and a last push on 2025-07-25; it is an open-source API security platform, so adjacent but not the same as pure monitoring.
  - [metlo-labs/metlo](https://github.com/metlo-labs/metlo) `github` — 2022-07-26
- BricksLLM has 1,220 stars and a last push on 2025-01-05; it adds cost and rate limiting per API key with monitoring for LLM APIs.
  - [bricks-cloud/BricksLLM](https://github.com/bricks-cloud/BricksLLM) `github` — 2023-07-18
- Statusok has 1,642 stars but its last push was 2021-08-11, so it looks stale rather than actively maintained.
  - [sanathp/statusok](https://github.com/sanathp/statusok) `github` — 2015-08-26

## What people actually say

*From data*

- "I need to keep track of updates to the changelog, I can't be constantly manually monitoring" — a Discourse user on OpenAI API changelog tracking.
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
- "The `https://api.anthropic.com/api/oauth/usage` endpoint returns `rate_limit_error` (HTTP 429) so aggressively that it makes it effectively impossible to poll usage data" — a GitHub issue about usage monitoring being blocked by rate limits.
  - [(BUG) /api/oauth/usage endpoint aggressively rate limits, making usage monitoring unusable](https://github.com/anthropics/claude-code/issues/31637) `githubissues` — 2026-03-06
- "I built an internal monitoring tool that connects to my AI app, and alerts me when I'm about to hit rate limits" — a Discourse post about rate-limit monitoring for AI APIs.
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05
- "After deploying a DeepSeek-based code review agent, I got a $3,247 bill at month-end with no idea which agent or customer caused the spike" — a GitHub issue describing cost attribution pain.
  - [Community Case: Monitoring DeepSeek API Costs Per Agent with One-Line SDK](https://github.com/deepseek-ai/DeepSeek-V3/issues/1417) `githubissues` — 2026-06-11
- "Existing solutions felt overpriced and overcomplicated for my small-scale needs" — a Hacker News post from someone building API monitoring for solopreneurs and indie hackers.
  - [Show HN: API monitoring for solopreneurs and indie hackers](https://news.ycombinator.com/item?id=41502493) `hackernews` — 2024-09-10
- "OpenAI's billing page shows total spend. It doesn't show which feature, which tenant, or which conversation caused it" — a Dev.to post about monitoring gaps in API spend attribution.
  - [OpenAI Tells You What You Spent. Not Where. So I Built a Dashboard.](https://dev.to/alimafana/openai-tells-you-what-you-spent-not-where-so-i-built-a-dashboard-b6) `devto` — 2026-04-30

## People asking to be sold to

*From data*

- "I need to keep track of updates to the changelog, I can't be constantly manually monitoring" shows a direct willingness to use tooling for API changelog tracking.
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
- "I built an internal monitoring tool that connects to my AI app" shows someone already building internally because the need is real enough to solve in-house.
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05
- "it makes it effectively impossible to poll usage data" shows an immediate need for an alternative way to monitor usage and limits.
  - [(BUG) /api/oauth/usage endpoint aggressively rate limits, making usage monitoring unusable](https://github.com/anthropics/claude-code/issues/31637) `githubissues` — 2026-03-06
- "I got a $3,247 bill at month-end with no idea which agent or customer caused the spike" is a strong pain signal for paid cost-monitoring and attribution.
  - [Community Case: Monitoring DeepSeek API Costs Per Agent with One-Line SDK](https://github.com/deepseek-ai/DeepSeek-V3/issues/1417) `githubissues` — 2026-06-11
- "it seems that other people find it useful too, enough even to pay money for it!" is a first-person buying signal from a founder already selling API monitoring.
  - [Show HN: Apitally – REST API monitoring made easy](https://news.ycombinator.com/item?id=39523506) `hackernews` — 2024-02-27

## Where the opening is

*Model estimate*

- The data does not show a single dominant product that combines API uptime checks, API changelog monitoring, usage/cost attribution, and rate-limit alerting in one focused workflow.
  - [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) `github` — 2023-06-19
  - [npm: apitally](https://www.npmjs.com/package/apitally) `registries` — 2026-05-29
  - [(BUG) /api/oauth/usage endpoint aggressively rate limits, making usage monitoring unusable](https://github.com/anthropics/claude-code/issues/31637) `githubissues` — 2026-03-06
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
  - [Community Case: Monitoring DeepSeek API Costs Per Agent with One-Line SDK](https://github.com/deepseek-ai/DeepSeek-V3/issues/1417) `githubissues` — 2026-06-11
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05
  - [Show HN: Apitally – REST API monitoring made easy](https://news.ycombinator.com/item?id=39523506) `hackernews` — 2024-02-27
- Existing tools cover slices: uptime and status pages, gateway monitoring, security, or LLM cost controls, but the search does not surface a clear specialist for monitoring API changelogs and usage limits together.
  - [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) `github` — 2023-06-19
  - [operacle/checkcle](https://github.com/operacle/checkcle) `github` — 2025-05-09
  - [metlo-labs/metlo](https://github.com/metlo-labs/metlo) `github` — 2022-07-26
  - [bricks-cloud/BricksLLM](https://github.com/bricks-cloud/BricksLLM) `github` — 2023-07-18
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05
- A narrower product for AI API teams could target the specific pain of rate-limit warnings and cost attribution across multiple providers, which shows up repeatedly in the complaints.
  - [(BUG) /api/oauth/usage endpoint aggressively rate limits, making usage monitoring unusable](https://github.com/anthropics/claude-code/issues/31637) `githubissues` — 2026-03-06
  - [Community Case: Monitoring DeepSeek API Costs Per Agent with One-Line SDK](https://github.com/deepseek-ai/DeepSeek-V3/issues/1417) `githubissues` — 2026-06-11
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05
- For small teams, the market still looks fragmented: some people want self-hosted monitoring, some want dashboards, and some want alerting on external API changes.
  - [Show HN: Apitally – A simple, privacy-focused API monitoring and analytics tool](https://news.ycombinator.com/item?id=42915435) `hackernews` — 2025-02-03
  - [Show HN: API monitoring for solopreneurs and indie hackers](https://news.ycombinator.com/item?id=41502493) `hackernews` — 2024-09-10
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05
  - [Show HN: Apitally – REST API monitoring made easy](https://news.ycombinator.com/item?id=39523506) `hackernews` — 2024-02-27

## How big the market might be

*Model estimate*

- This search found 12 named open-source projects, with 7 active and 5 dead, so the category is established and not empty.
  - [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) `github` — 2023-06-19
  - [microsoft/Detours](https://github.com/microsoft/Detours) `github` — 2016-10-19
  - [router-for-me/Cli-Proxy-API-Management-Center](https://github.com/router-for-me/Cli-Proxy-API-Management-Center) `github` — 2025-09-06
  - [Findomain/Findomain](https://github.com/Findomain/Findomain) `github` — 2019-04-14
  - [operacle/checkcle](https://github.com/operacle/checkcle) `github` — 2025-05-09
  - [metlo-labs/metlo](https://github.com/metlo-labs/metlo) `github` — 2022-07-26
  - [sanathp/statusok](https://github.com/sanathp/statusok) `github` — 2015-08-26
  - [bricks-cloud/BricksLLM](https://github.com/bricks-cloud/BricksLLM) `github` — 2023-07-18
  - [kisslove/web-monitoring](https://github.com/kisslove/web-monitoring) `github` — 2018-05-16
  - [orlabs/orange](https://github.com/orlabs/orange) `github` — 2016-03-19
  - [monitoringartist/grafana-aws-cloudwatch-dashboards](https://github.com/monitoringartist/grafana-aws-cloudwatch-dashboards) `github` — 2016-07-09
  - [graphql-hive/graphql-inspector](https://github.com/graphql-hive/graphql-inspector) `github` — 2018-11-15
- The largest named project in the set is openstatusHQ/openstatus at 8,932 stars and it is still maintained, which suggests visible demand.
  - [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) `github` — 2023-06-19
- Apitally's npm package has 11,347 downloads last month, and moesif-aws-lambda has 186, showing real usage beyond stars alone.
  - [npm: apitally](https://www.npmjs.com/package/apitally) `registries` — 2026-05-29
  - [npm: moesif-aws-lambda](https://www.npmjs.com/package/moesif-aws-lambda) `registries` — 2025-12-02
- There are 37 first-hand complaints, 1 unsolved Stack Exchange question, and 3 stated wants across matching community forums and issue trackers.
  - [(BUG) /api/oauth/usage endpoint aggressively rate limits, making usage monitoring unusable](https://github.com/anthropics/claude-code/issues/31637) `githubissues` — 2026-03-06
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
  - [Community Case: Monitoring DeepSeek API Costs Per Agent with One-Line SDK](https://github.com/deepseek-ai/DeepSeek-V3/issues/1417) `githubissues` — 2026-06-11
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05
  - [How to monitor a complete directory tree for changes in Linux](https://stackoverflow.com/questions/8699293/how-to-monitor-a-complete-directory-tree-for-changes-in-linux) `stackexchange` — 2012-01-02
  - [I am doing a startup (putting virtual machines on the web)](https://news.ycombinator.com/item?id=1535967) `intent` — 2010-07-21
- Matching forum threads were found on community.home-assistant.io, community.n8n.io, community.openai.com, discuss.elastic.co, discuss.python.org, and forum.djangoproject.com, which means the topic keeps surfacing in multiple communities.
  - [GSoC 2026 - Proposal: Switch to Playwright for Django Integration Testing](https://forum.djangoproject.com/t/gsoc-2026-proposal-switch-to-playwright-for-django-integration-testing/44700) `discourse` — 2026-03-25
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05

## What could go wrong

*Model estimate*

- The category is crowded, and several projects already have large star counts and active maintenance, so a generic API monitoring product will be hard to differentiate.
  - [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) `github` — 2023-06-19
  - [router-for-me/Cli-Proxy-API-Management-Center](https://github.com/router-for-me/Cli-Proxy-API-Management-Center) `github` — 2025-09-06
  - [Findomain/Findomain](https://github.com/Findomain/Findomain) `github` — 2019-04-14
  - [operacle/checkcle](https://github.com/operacle/checkcle) `github` — 2025-05-09
  - [bricks-cloud/BricksLLM](https://github.com/bricks-cloud/BricksLLM) `github` — 2023-07-18
- Many existing tools sit next to monitoring rather than squarely in it, such as security platforms, gateways, status pages, and observability libraries.
  - [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) `github` — 2023-06-19
  - [operacle/checkcle](https://github.com/operacle/checkcle) `github` — 2025-05-09
  - [metlo-labs/metlo](https://github.com/metlo-labs/metlo) `github` — 2022-07-26
  - [graphql-hive/graphql-inspector](https://github.com/graphql-hive/graphql-inspector) `github` — 2018-11-15
  - [bricks-cloud/BricksLLM](https://github.com/bricks-cloud/BricksLLM) `github` — 2023-07-18
- Some of the strongest pain signals are tied to AI APIs specifically, so a broad product may be too vague while a narrow AI-API product may be too niche.
  - [(BUG) /api/oauth/usage endpoint aggressively rate limits, making usage monitoring unusable](https://github.com/anthropics/claude-code/issues/31637) `githubissues` — 2026-03-06
  - [Community Case: Monitoring DeepSeek API Costs Per Agent with One-Line SDK](https://github.com/deepseek-ai/DeepSeek-V3/issues/1417) `githubissues` — 2026-06-11
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05
  - [Show HN: Apitally – REST API monitoring made easy](https://news.ycombinator.com/item?id=39523506) `hackernews` — 2024-02-27
- Several dead projects in the set suggest earlier attempts did not stay maintained, which raises the risk of building another generic monitoring tool with weak retention.
  - [w3tecch/express-typescript-boilerplate](https://github.com/w3tecch/express-typescript-boilerplate) `github` — 2017-05-01
  - [stutrek/scrollmonitor](https://github.com/stutrek/scrollmonitor) `github` — 2013-01-08
  - [IvanGlinkin/CCTV](https://github.com/IvanGlinkin/CCTV) `github` — 2024-04-26
  - [orlabs/orange](https://github.com/orlabs/orange) `github` — 2016-03-19
  - [sanathp/statusok](https://github.com/sanathp/statusok) `github` — 2015-08-26

## What to do this week

*Model estimate*

- Start with AI API monitoring for cost, rate-limit, and usage attribution across OpenAI, Anthropic, and similar providers, because those pains are explicit in the signals.
  - [(BUG) /api/oauth/usage endpoint aggressively rate limits, making usage monitoring unusable](https://github.com/anthropics/claude-code/issues/31637) `githubissues` — 2026-03-06
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
  - [Community Case: Monitoring DeepSeek API Costs Per Agent with One-Line SDK](https://github.com/deepseek-ai/DeepSeek-V3/issues/1417) `githubissues` — 2026-06-11
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05
- Make changelog monitoring a first-class feature, not an add-on, because one user explicitly said manual monitoring was not feasible.
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
- Differentiate on alerting that explains why the API is failing or expensive, not just whether it is up.
  - [(BUG) /api/oauth/usage endpoint aggressively rate limits, making usage monitoring unusable](https://github.com/anthropics/claude-code/issues/31637) `githubissues` — 2026-03-06
  - [Community Case: Monitoring DeepSeek API Costs Per Agent with One-Line SDK](https://github.com/deepseek-ai/DeepSeek-V3/issues/1417) `githubissues` — 2026-06-11
  - [Show HN: Apitally – REST API monitoring made easy](https://news.ycombinator.com/item?id=39523506) `hackernews` — 2024-02-27
- If you want a broader product, validate whether teams really want a single pane for uptime, docs changelogs, quotas, and spend before building it; the search does not yet prove that bundle is wanted.
  - [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) `github` — 2023-06-19
  - [npm: apitally](https://www.npmjs.com/package/apitally) `registries` — 2026-05-29
  - [operacle/checkcle](https://github.com/operacle/checkcle) `github` — 2025-05-09
  - [bricks-cloud/BricksLLM](https://github.com/bricks-cloud/BricksLLM) `github` — 2023-07-18
  - [Monitoring OpenAI API changelog](https://community.openai.com/t/monitoring-openai-api-changelog/544688) `discourse` — 2023-12-05
  - [Rate limit monitoring for AI APIs](https://community.openai.com/t/rate-limit-monitoring-for-ai-apis/1378617) `discourse` — 2026-04-05

## Competitor strength

| Project | Stars | Downloads/mo | Activity |
|---|---:|---:|---|
| [openstatusHQ/openstatus](https://github.com/openstatusHQ/openstatus) | 8,932 | — | active |
| [microsoft/Detours](https://github.com/microsoft/Detours) | 6,339 | — | active |
| [router-for-me/Cli-Proxy-API-Management-Center](https://github.com/router-for-me/Cli-Proxy-API-Management-Center) | 3,789 | — | active |
| [Findomain/Findomain](https://github.com/Findomain/Findomain) | 3,782 | — | active |
| [open-telemetry/opentelemetry-js](https://github.com/open-telemetry/opentelemetry-js) | 3,426 | — | active |
| [w3tecch/express-typescript-boilerplate](https://github.com/w3tecch/express-typescript-boilerplate) | 3,418 | — | dead |
| [stutrek/scrollmonitor](https://github.com/stutrek/scrollmonitor) | 3,275 | — | dead |
| [operacle/checkcle](https://github.com/operacle/checkcle) | 2,803 | — | active |
| [IvanGlinkin/CCTV](https://github.com/IvanGlinkin/CCTV) | 2,476 | — | dead |
| [orlabs/orange](https://github.com/orlabs/orange) | 2,308 | — | dead |
| [monitoringartist/grafana-aws-cloudwatch-dashboards](https://github.com/monitoringartist/grafana-aws-cloudwatch-dashboards) | 2,263 | — | dead |
| [Icinga/icinga2](https://github.com/Icinga/icinga2) | 2,225 | — | active |

## Domain names

- `apimonitoring.com` — taken
- `apimonitoring.io` — available
- `api.com` — taken
- `getapi.com` — taken

---

Sources searched: hackernews (30), github (20), githubissues (20), discourse (17), intent (3), stackexchange (1), registries (15), tavily (9), devto (10)

Generated by Shows Its Work — https://showsitsworks.com/idea/an-api-monitoring-service
Findings link to their sources. Estimates are marked as estimates.