# Best contract, proposal and e-signature APIs for AI agents (slim)

> Dropbox Sign (B), airSlate SignNow (B) and PandaDoc (B) lead the 8 ranked contract, proposal and e-signature APIs. Picks by need, strengths, weaknesses and prices from the Anchor benchmark.

- Full: https://www.anchorterminal.com/best/e-signatures/index.md (~5,550 tokens) · this version ~1,430 tokens · JSON https://www.anchorterminal.com/best/e-signatures/index.json · canonical https://www.anchorterminal.com/best/e-signatures/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

All 8 ranked contract, proposal and e-signature APIs on the Anchor benchmark, with a pick for each need and where each one falls short. Scores come from public evidence, re-checked as vendors change.

- Ranked: 8 · agent-ready (BB or better): 0 · accept x402: 0 · hosted endpoints: 8
- Full ranked table: https://www.anchorterminal.com/categories/e-signatures.md
- Head-to-head comparisons: https://www.anchorterminal.com/compare/e-signatures/index.md (28)
- Methodology: https://www.anchorterminal.com/benchmark/index.md

## The shortlist

| # | Tool | Grade | Score | Best for | Price | Where |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | [Dropbox Sign](https://www.anchorterminal.com/tools/dropbox-sign.md) | B | 68.9 | An agent that sends a prepared PDF or a saved template for signature from one company account and tracks it to completion by webhook or polling, with the signed PDF and audit trail at the end. | Paid | hosted |
| 2 | [airSlate SignNow](https://www.anchorterminal.com/tools/signnow.md) | B | 68.5 | An agent that sends agreements from templates, embeds signing in another product or tracks invites, and teams that want per-invite pricing with a free test mode. | $2 / tx | hosted and local |
| 3 | [PandaDoc](https://www.anchorterminal.com/tools/pandadoc.md) | B | 63.1 | Suited to agents that prepare a proposal, quote or contract from a template, send it for signature and track it, for a team that already works in PandaDoc. | Freemium | hosted |
| 4 | [Documenso](https://www.anchorterminal.com/tools/documenso.md) | B | 62.8 | Teams that want an e-signature API they can also self-host, with templates, embedded signing and an audit log by API. | Freemium | hosted |
| 5 | [Docusign](https://www.anchorterminal.com/tools/docusign.md) | B | 62.5 | Teams whose company already uses Docusign and needs an agent to send envelopes from templates, embed signing and track status with a full audit trail. | $50 / mo | hosted |
| 6 | [DocuSeal](https://www.anchorterminal.com/tools/docuseal.md) | B | 62.4 | A software company adding signing to its own product, paying per completed document, with HTML, PDF tag and DOCX variable templates and embeddable forms, and a choice of US or EU hosting or self-hosting. | $0.20 / tx | hosted |
| 7 | [SignWell](https://www.anchorterminal.com/tools/signwell.md) | C | 61.9 | A small software team adding signing to its own product at a per-document price with no seat minimum, embedded signing, requesting and template editing, and bulk send to 500 recipients. | $0.85 / tx | hosted and local |
| 8 | [Adobe Acrobat Sign](https://www.anchorterminal.com/tools/adobe-acrobat-sign.md) | D | 52.6 | A company that already holds Acrobat Sign Solutions and wants an agent to send agreements, track them by webhook and fetch signed files and audit trails. | $16.99 / seat-mo | hosted |

## Picks by need

- Highest score overall: [Dropbox Sign](https://www.anchorterminal.com/tools/dropbox-sign.md), B, 68.9/100 on the benchmark. Also [airSlate SignNow](https://www.anchorterminal.com/tools/signnow.md), B, 68.5/100.
- Reliability: [airSlate SignNow](https://www.anchorterminal.com/tools/signnow.md), 93/100 on reliability, against 75 for the overall leader.
- Security & auth: [Adobe Acrobat Sign](https://www.anchorterminal.com/tools/adobe-acrobat-sign.md), 66/100 on security & auth, against 65 for the overall leader.
- Maintenance & community: [Documenso](https://www.anchorterminal.com/tools/documenso.md), 93/100 on maintenance & community, against 85 for the overall leader.
- Transparency & trust: [DocuSeal](https://www.anchorterminal.com/tools/docuseal.md), 79/100 on transparency & trust, against 68 for the overall leader.
- A hosted MCP endpoint: [airSlate SignNow](https://www.anchorterminal.com/tools/signnow.md), remote MCP server, nothing to install.
- Self-hosting under an open licence: [Documenso](https://www.anchorterminal.com/tools/documenso.md), self-hosted, AGPL-3 licence. Also [DocuSeal](https://www.anchorterminal.com/tools/docuseal.md), self-hosted, AGPL-3 licence.

## How to choose

- Field placement from templates: Check that template fields land in the right place on the signed file, since an agent that fills fields by position needs them to stay fixed.
- Status events for each signer: Check which status events are sent for each signer and whether they arrive by webhook, since an agent needs them to know when a signature has landed.
- Audit trail in the signed file: Check that the signed file carries an audit trail with signer identity and timestamps, since that record shows when each signature was made.
- Embedded signing in your product: Check whether signing can be embedded in your own product, since a redirect to an outside page breaks a flow an agent is driving.

- How the benchmark tests this category: One agreement prepared from a template with the same fields, sent to two test signers and tracked to completion through each listing's API. We check field placement, the status events received, the signed file and its audit trail. In this run listings are graded from public evidence against the published checklist.

Each listing's verdict, strengths and weaknesses: https://www.anchorterminal.com/best/e-signatures/index.md