The digital signatures are an important aspect of businesses, especially when top managers and business owners travel frequently, making verification of signatures a tedious task that leads to time wastage. Digital signatures are legally compliant and can be used as proof or verification in a court of law, improving efficiency, time, and cost savings for businesses. Companies need to use e-signature APIs to be able to use electronic signatures. The best eSignature API is DocuSign REST API, which is best for integrating e-signatures into mobile apps. Other top picks include E-signatures.io, WebMerge, Hellosign, Eledo, Concord Contract Management, Eversign, and SignNow. These APIs offer various features such as legal contract signing, signature collection, customized digital signatures, creating signatures for PDF documents, automation of electronic signatures in documents, seamless eSignatures, and more. Each API has its unique pricing plans and popularity scores, making it essential to choose the best one that suits your business needs.