Project Euler
LeetCode
Exercism
Codewars
HackerRank
CodeCombat
CodeForces
CodeSignal
APIMaster
OpenRouter
BazaarLink
VoidLLM
AnyAPI
liteLLM
Deep Infra
GPT4All
APIMaster is an AI API marketplace offering OpenAI, Claude, and DeepSeek API keys at up to 90% off official pricing. One API key gives you access to all major models with OpenAI-compatible endpoints โ plug directly into Cursor, Claude Code, or any SDK.
Every provider is fingerprint-verified weekly to ensure you're getting the real model. Supports PayPal, USDT, and ePay. No subscription, pay-as-you-go from $1.
Project Euler
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APIMaster's answer:
Next.js, Go, Python (Flask), PostgreSQL
APIMaster's answer:
Fingerprint verification โ we test every provider weekly using behavioral fingerprinting to detect model substitution. You can see which providers serve real models vs fake substitutes on our public leaderboard. No other API marketplace does this.
APIMaster's answer:
APIMaster is the only marketplace that verifies what model you're actually getting. Competitors like OpenRouter route traffic without verification โ you might pay for Claude Opus but receive a cheaper model. APIMaster detects this and only recommends verified providers. Plus, prices are up to 90% off official rates โ you get both cost savings and model authenticity guaranteed.
APIMaster's answer:
Developers who use OpenAI, Claude, or DeepSeek APIs and want to reduce costs without sacrificing model quality. Especially useful for developers in markets where direct API access is expensive or restricted.
APIMaster's answer:
Built after discovering that many cheap API resellers secretly substitute expensive models with cheaper ones. We built fingerprint detection first, then a marketplace that only lists providers that pass verification.
Based on our record, Project Euler seems to be more popular. It has been mentiond 415 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Let's hope this is going to help me solve some more Project Euler [1] problems! [1] https://projecteuler.net/. - Source: Hacker News / 3 months ago
Https://projecteuler.net/ for "Thinker" brain food. (it still has the issue of not being a pragmatic use of time, but there are plenty interesting enough questions which it at least helps). - Source: Hacker News / 6 months ago
I have a Project Euler (https://projecteuler.net/) account. Though I do not register at all on the leader board I will sometimes work obsessively on a problem just to make one of the level icons light up for me. There is not really competition just a tiny reward. - Source: Hacker News / 8 months ago
I do hobby programing. It is sometimes to create something (supposedly) useful. Lately though it is more discovery and a little math like. I enjoy Project Euler (https://projecteuler.net/. Recently I have been playing with superpermutations (https://projecteuler.net/) and pencil and paper is useful but filling lots of paper with lots of numbers is not that fun. - Source: Hacker News / over 1 year ago
As pointed out in a sibling comment, it appears that quote only shows up if you're logged in, but assuming you have an account and are logged in, it's on the homepage (https://projecteuler.net/), second paragraph under the following heading: > I learned so much solving problem XXX, so is it okay to publish my solution elsewhere? > It appears that you have answered your own question. There is nothing quite like... - Source: Hacker News / over 1 year ago
LeetCode - Practice and level up your development skills and prepare for technical interviews.
OpenRouter - A router for LLMs and other AI models
Exercism - Download and solve practice problems in over 30 different languages.
BazaarLink - BazaarLink ๆฏๅฐ็ฃ AI API ่ๅๅนณๅฐ๏ผๆดๅ GPT-4oใClaudeใGeminiใDeepSeek ็ญไธปๆตๆจกๅ๏ผๆไพ OpenAI ็ธๅฎน APIใๅฐๅนฃ่จ่ฒปใไธ่ฏๅผ็ตฑไธ็ผ็ฅจ๏ผๅๅฉๅฐ็ฃ้็ผ่ ่ไผๆฅญไธฒๆฅๆๆฐ AI ๆๅใ
Codewars - Achieve code mastery through challenge.
VoidLLM - Self-hosted LLM proxy with load balancing, multi-provider routing, API key management, and usage tracking. Privacy-first โ zero knowledge of your prompts.