CEX.IO is a regulated multi-functional cryptocurrency exchange. Established in 2013, it now has offices in the UK, US, Ukraine, Cyprus, and Gibraltar. With more than 3 million users across the globe, CEX.IO provides reliable services backed by cold cryptocurrency storage, financial viability, high security, and KYC/AML best practices. CEX.IO Exchange was one of the first platforms to make fiat-to-crypto transactions accessible by offering card payments and bank transfers to the clients. Currently, we provide a variety of trading tools for Bitcoin, Bitcoin Cash, Ethereum, Ripple, Stellar, Litecoin, Tron, and other crypto assets. You can trade these cryptocurrencies for USD, EUR, GBP, and RUB. We know that mobility matters, so we’ve enabled trading through a website, iOS and Android mobile apps, WebSocket, and REST API.
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Okyline is an Executable Data Design (EDD) platform for declarative data validation contracts and measurable operational data quality.
Instead of maintaining disconnected specifications, validators, tests, and quality dashboards, Okyline uses a single executable contract as the operational source of truth for validation and flow quality monitoring.
The same readable contract drives multi-format validation, deterministic execution, quality measurement, data quality gate, and historical quality analytics across APIs, events, files, LLM structured outputs, and enterprise data flows.
Community Edition provides the open specification, a free Java validation runtime, a public Claude AI assistant for contract generation, and a free online studio for executable JSON validation contracts and JSON Schema transpilation.
Enterprise Edition supports direct validation of JSONL, XML, CSV, FIXED, and EDI flows, data quality gate, and operational quality dashboards, all without databases
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PropLine
PropLine is a real-time player-props betting odds API serving 54 sports and 25 books — including Pinnacle and six exchanges (Kalshi, Polymarket, Smarkets, Matchbook, Novig, ProphetX) that the-odds-api and OddsJam don't carry. It is the only odds API that resolves player props against actual box scores: every Over/Under outcome ships with won/lost/push/void plus the real stat value. Pricing is per request, not per credit, so player props and alternate lines don't multiply your bill the way they do on credit-metered APIs. The response schema is the-odds-api-compatible, so migrating is a base-URL change. Free tier is 1,000 requests/day, no credit card; Hobby is $9/mo for 5,000/day and unlocks every paid feature — cross-book +EV, line history, closing lines and graded resolution; Pro is $19/mo for 25,000/day, adding CSV exports; Streaming Lite is $39/mo for 100,000/day and Streaming is $79/mo for 1M/day, both with HMAC-signed webhooks. Official Python, Node, MCP and CLI SDKs.
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