APIMaster
OpenRouter
BazaarLink
VoidLLM
AnyAPI
liteLLM
Deep Infra
GPT4All
IsValid.dev
Abstract APIs
Numverify
mailboxlayer API
IBAN.com
VAT-calc.net
Melissa Data Quality
MailValidation.io
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.
IsValid is a validation API service for developers who need to quickly verify data formats without building their own validators. It offers 40+ endpoints covering financial identifiers (IBAN, BIC, ISIN, CUSIP), international standards (ISBN, ISSN), technology formats (UUID, JWT, QR codes), regional codes (PESEL, REGON, VAT), and more.
The service works on a freemium model โ 100 free API calls per day, no credit card required. Users manage API keys through a dashboard with usage analytics showing daily call volume and per-endpoint breakdowns.
APIMaster IsValid.devAPIMaster'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.
IsValid.dev's answer:
IsValid offers 70+ validators in a single API โ covering financial identifiers (IBAN, BIC, ISIN, LEI), international standards (ISBN, ISSN), technology formats (UUID, JWT, QR codes), tax numbers (VAT, REGON, PESEL), credit cards, phone numbers, and more. No need to integrate multiple services for different data types.
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.
IsValid.dev's answer:
Most validation APIs focus on one category (email or phone). IsValid covers financial, regional, and technical formats all in one place with a consistent REST API. The free tier with 100 calls/day requires no credit card, and integration takes minutes.
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.
IsValid.dev's answer:
Developers and software teams building applications that handle user input, financial data, or international identifiers โ particularly in fintech, e-commerce, and SaaS products.
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.
IsValid.dev's answer:
IsValid was built out of frustration with piecing together multiple validation libraries and services. The goal was a single, reliable API that handles the full range of data validation needs developers encounter in real-world applications.
APIMaster's answer
Next.js, Go, Python (Flask), PostgreSQL
IsValid.dev's answer:
Next.js, Fastify, PostgreSQL, Docker
OpenRouter - A router for LLMs and other AI models
Abstract APIs - Simple, powerful APIs for everyday dev tasks
BazaarLink - BazaarLink ๆฏๅฐ็ฃ AI API ่ๅๅนณๅฐ๏ผๆดๅ GPT-4oใClaudeใGeminiใDeepSeek ็ญไธปๆตๆจกๅ๏ผๆไพ OpenAI ็ธๅฎน APIใๅฐๅนฃ่จ่ฒปใไธ่ฏๅผ็ตฑไธ็ผ็ฅจ๏ผๅๅฉๅฐ็ฃ้็ผ่ ่ไผๆฅญไธฒๆฅๆๆฐ AI ๆๅใ
Numverify - Global phone number validation and lookup API
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.
mailboxlayer API - Mailboxlayer is a free, simple and powerful JSON API offering instant email address validation & verification via syntax checks, typo and spelling checks, SMTP checks, free and disposable provider filtering, and much more.
