Enterprise E-Signature RFP Checklist: Costs and APIs

Avoid choosing an e-signature platform that becomes expensive or difficult to integrate

An enterprise e-signature platform can appear affordable during a trial and become costly or operationally restrictive when more teams, documents, signers, or integrations are added. Procurement teams need to understand how usage is billed, what happens when limits are reached, how completed documents can be exported, and whether the platform fits the organization's security and deployment requirements.

An effective e-signature RFP should test real workflows - not just collect a list of feature checkboxes.

Start with the workflows the business actually needs

Before comparing vendors, identify the signing scenarios that matter most:

• Employees signing internal policies or agreements.
• Sales teams sending customer contracts.
• Operations teams sending high volumes of similar documents.
• Events or service locations collecting signatures from people whose email addresses are not known in advance.
• Applications creating signature requests through an API.
• Teams retrieving completed documents and evidence for audits or disputes.

Different workflows may require individual requests, bulk signing, public signing links, multi-signer routing, or API integration. Ask vendors to demonstrate the relevant scenarios using realistic documents and recipient data.

Enterprise e-signature RFP checklist

1. Pricing and usage limits

Ask vendors:

• What is the billable unit: envelope, document, signer, user, transaction, or another measure?
• Are multiple documents in one request counted separately?
• Are bulk requests priced differently from individual requests?
• Are API calls, verification, storage, reminders, or integrations charged separately?
• What happens when the plan's quota is reached?
• Are unused credits carried forward, or do they reset?
• Are there minimum commitments, overage charges, or renewal increases?

Why it matters: A low advertised price does not reveal the total cost of a workflow. Model costs against the organization's expected usage and include growth scenarios.

2. Bulk and public signing

Ask the vendor to demonstrate two different use cases:

1. Sending separate signature requests to a known list of recipients.
2. Allowing an unknown or walk-in signer to open a public signing link or QR code.

These are not the same workflow. Bulk signing is intended for many known recipients; public signing is useful when the signer starts from a shared link. Verify how the system associates each completed document with the correct record and how misuse of a public link is controlled.

3. API and integration capabilities

Ask:

• Can an application create a signature request programmatically?
• How are request IDs returned and stored?
• Are status webhooks available, and how are they authenticated?
• Can the application retrieve the completed PDF and signing evidence?
• Are retries, rate limits, error codes, and API quotas documented?
• Is there a sandbox or test environment?
• What happens if the receiving application is unavailable when a completion event occurs?

Do not accept "API available" as a complete answer. Test the failure path as well as the successful path.

4. Document ownership, export, and retention

Ask vendors to demonstrate how an administrator can export:

• Completed PDFs.
• Available audit trails or signing certificates.
• Original uploaded documents, where applicable.
• Relevant metadata and request identifiers.

Confirm whether exports are available in bulk, what happens after cancellation or account termination, and whether the organization can retrieve records without relying on a vendor-specific viewer. Clarify retention, deletion, backup, and legal-hold policies.

5. Security and access control

Evaluate the controls that fit the organization's risk profile:

• Role-based permissions and administrative controls.
• Authentication options for senders and signers.
• Data encryption and key-management arrangements.
• Audit logging and access history.
• Data location and subprocessors.
• Incident response and availability commitments.
• Retention and deletion controls.
• Independent security reports or certifications, where relevant.

Avoid treating a single certification or a "secure" label as proof that every requirement is met. Ask for evidence and map each control to the organization's actual obligations.

6. Deployment and data control

Compare hosted SaaS, self-hosted software, and custom-built solutions on their full operating requirements.

No deployment model automatically eliminates lock-in, security risk, or operating costs. Evaluate contractual rights, export options, upgrade responsibilities, staffing, and recovery plans.

Score vendors using a weighted evaluation

Choose weights before demos so the team does not change its priorities to match a vendor's presentation.

Adjust the weights to match your organization. A regulated business may assign more weight to security and evidence; a software company may prioritize API reliability and integration.

Require a realistic proof of concept

Give each shortlisted vendor the same test cases:

1. Send a two-document agreement to two signers in the required order.
2. Send separate requests to a sample list of recipients.
3. Open a public signing link from a mobile device.
4. Interrupt an integration after a request is created and verify recovery behavior.
5. Receive or simulate a completion event and retrieve the signed PDF.
6. Export the document and its available signing evidence.
7. Confirm how administrators identify pending, failed, cancelled, and completed requests.

Record the outcome, limitations, and any extra development required. Do not compare a vendor's standard feature with another vendor's custom-built demonstration as if they were equivalent.

How UnderSign fits into an evaluation

UnderSign may be relevant to organizations assessing signature workflows, bulk signing, public signing links, APIs, or self-hosted deployment options. Buyers should verify which capabilities are included in the specific plan or deployment and which require configuration or custom development.

The same checklist should be used to assess UnderSign and other shortlisted platforms. That makes the evaluation more useful and credible than a one-sided comparison.

Questions enterprise buyers ask