Clearbit has developed a Risk API to combat the challenges of spam signups and fraud in online businesses, which often involve the use of stolen credit cards and fake accounts. Spam signups occur when false information is provided by individuals or bots, posing risks such as phishing and malware. Clearbit has leveraged its proprietary dataset, device fingerprinting, and machine learning models to create an API that assigns a risk score to each transaction by analyzing factors like disposable email addresses, proxy use, and signup velocity. The Risk API, which has demonstrated a 95% success rate in detecting spam signups during tests, allows businesses to take preventive actions by identifying suspicious signups. Users are offered 50,000 free requests per month to encourage widespread use and enhance the API's effectiveness, as it continuously evolves to outpace fraudsters.