Top 8 Best eSignature APIs & Alternatives (2021)

Developed by DocuSign, this award-winning API allows users to integrate electronic signatures into documents within minutes easily. The API allows users to request signatures for contracts, download documents and embed the DocuSign interface into applications.

The DocuSign REST API relies on the REST architectural design. It supports programming languages such as Python, Bash, Nodejs, Java, C# Poweshell, PHP, and Ruby.

The embedded signing feature of the API allows users to collect signatures from their apps. The collection happens without sending an email to the signer or directing them to an external link.

Requesting signature takes five steps.

1. The first step is to obtain an authentication key or OAuth token.

2. Secondly, you must create and define your envelope. The envelope allows the API to set the contact details of the signer.

3. The third step involves calling the API using the definition created in the previous step.

4. Step four involves developing the recipient's view.

5. The final step is to create the recipient view and begin signing. Upon a successful call, the API returns the result in JSON data format.

Pricing: The API is free for unlimited requests.

The API allows you to send contracts to multiple people for signing. Typically, the API allows you to set up a contract from the available templates and prompts users to type in information before signing.

The eSignature.io API uses the REST framework and applies HTTPS requests methods. The API delivers responses in JSON data format. It also creates contracts and sends links via email or SMS for people to collect their signatures. eSignature.io then returns details of the arrangements and the values entered by the signers.

The webhooks feature allows users to get real-time information about any signing of the contract. The API also returns notifications on signers who refuse to sign or withdraw a contract. Additionally, the eSignature.io allows signers to request a mobile number update.

Pricing

• The Basic plan costs $4.90 per month, limited to ten contracts. The overage queries cost $0.49 each.
• The Pro tier costs $49 per month for 130 calls. Any additional call costs $0.49.
• The Ultra plan costs $199 per month for 600 requests. Every extra query costs $0.49.
• The Mega package cost $599 for 2500 contracts. Each additional query costs $0.20.

Like most APIs, WebMerge comes in the Rest format. It supports several programming languages such as PHP and Ruby. It allows a user to send, upload and share documents. It is useful in generating documents that have customized options and varied content.

With this API, you can integrate various web services with document generation.

This API has unlimited requests and is free.

This Restful API is one of the fastest in the market. It is highly effective when it comes to customizing and creating signatures. It contains well-detailed documentation that provides step-by-step instructions on how to use it. This process makes it easy for the users to utilize the API

The signatures created using the API are legally binding, and they comply with the rules set by recognized international bodies such as the European Union. For security purposes, the API ensures that the documents are encrypted, the audits are secure, and provide access times and IP addresses.

It has an embed signature feature that enables a user to text and sign on documents from the website without signing in. The API easily integrates with other services, applications, and websites, making the signing process much more manageable.

This API has unlimited requests, and it is free.

Developed by Eledo, this API allows users to create and download signable documents. The API uses the REST architectural style and uses HTTPS requests methods in making requests. It also allows users to use the CSS programming language to place and style electronic signatures in PDF documents.

Pricing

• The Basic plan is free limited to 100 PDFs per month. Any additional query costs $0.10.

• The Pro tier costs $8.90 per month for 200 calls. The overage price for each extra query is $0.06.

• The Ultra package costs $24.9/month for 600 PDF generated. However, any additional PDF costs $0.05.

• The Mega pricing plan costs $79.9 per month for 1800 PDF documents. Every extra request costs $0.040.

This software is a Restful API that uses the JSON format to request and give data responses. It is simple to use, and it works with all documents. It enables the user to connect to prove, documents, and processes from a single location.

It easily integrates with multiple solutions and tools and has regular updates to fix or maintain it for better performance. New fields, error codes, and endpoints enhance the user experience and keep up with recent technology advancements.

The API provides a channel through which clients can contact the experts who can then sort their problems. It also has an HTTP header API key through which users can authenticate themselves. As long as you have a concord account, you can generate numerous keys. The HTTP header provides security by hindering unauthorized access.

The API has three pricing plans.

• The basic plan has 100 requests and costs $99.99 a month.

• The pro package has 500requests and access to online document editing and costs $299.99 per month.

• The ultra package has unlimited requests, 1000 documents, and it costs $499.99 a month.

Eversign is a Restful API that supports JSON. It allows multiple programming languages from the server-side. One can use the API to perform several tasks on a document. Such duties include: creating, downloading, viewing, requesting signatures, and creating different templates.

E-signatures that are legally binding are hard to automate. However, with this API, you can automate several things, from list businesses to legal e-signatures.

It is simple to use as it contains straightforward prompts such as Get and Post, and the JSON format makes it easier to use. Further, the HTTPS encryption it uses makes it secure. Eversign is reliable in that it can handle a considerable number of e-signatures in a short time.

The API is free. However, for plan limits that exceed the limit, one has to pay extra charges.

Deliver a seamless eSignature experience from your website, CRM, or custom app by integrating the signNow REST API. Simplify the signing and management of documents online, make your teams more productive, and delight customers with intuitive and easy-to-use electronic signatures.