# Contract, proposal and e-signature APIs for AI agents

> 5 contracts, proposals & e-signatures ranked by the Anchor benchmark. Leader Dropbox Sign (B). Services that prepare an agreement from a template, send it for signature and report when it is signed. Compared on template and field handling, embedded signing, status events and the audit trail a signed document carries.

- Canonical: https://www.anchorterminal.com/categories/e-signatures
- Markdown: https://www.anchorterminal.com/categories/e-signatures.md (~2,000 tokens)
- Slim: https://www.anchorterminal.com/categories/e-signatures.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/categories/e-signatures.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

Services that prepare an agreement from a template, send it for signature and report when it is signed. Compared on template and field handling, embedded signing, status events and the audit trail a signed document carries.

- Tools ranked: 5 · agent-ready (BB or better): 0 · accept x402: 0 · hosted endpoints: 5 · desk reviews by the panel: 0
- JSON: https://www.anchorterminal.com/api/v1/tools.json (list) · https://www.anchorterminal.com/api/v1/rankings.json (ranked) · https://www.anchorterminal.com/api/v1/x402.json (payable) · https://www.anchorterminal.com/api/v1/capabilities.json (by capability)
- Grades run AA, A, BB, B, C, D, E, F · methodology: https://www.anchorterminal.com/benchmark/

- Capabilities in this category: esign.send, esign.templates, esign.embed, esign.status, contracts.generate
- https://letme.dev/esign.send picks the top-graded tool in this list and says how to call it direct; calling through letme comes later (https://www.anchorterminal.com/letme/index.md)

## Ranking

| # | Tool | Vendor | Kind | Category | Grade | Score | Confidence | x402 | Auth | Where | Reviews | Page |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 161 | Dropbox Sign | Dropbox, Inc. | HTTP API | E-signatures | B | 68.9 | medium | no | OAuth or key | hosted | none | https://www.anchorterminal.com/tools/dropbox-sign.md |
| 168 | airSlate SignNow | airSlate, Inc. | HTTP API | E-signatures | B | 68.5 | medium | no | OAuth or key | hosted + local | none | https://www.anchorterminal.com/tools/signnow.md |
| 287 | PandaDoc | PandaDoc | HTTP API | E-signatures | B | 63.1 | medium | no | OAuth or key | hosted | none | https://www.anchorterminal.com/tools/pandadoc.md |
| 294 | Documenso | Documenso, Inc. | HTTP API | E-signatures | B | 62.8 | medium | no | API key | hosted | none | https://www.anchorterminal.com/tools/documenso.md |
| 301 | Docusign | Docusign, Inc. | HTTP API | E-signatures | B | 62.5 | medium | no | OAuth | hosted | none | https://www.anchorterminal.com/tools/docusign.md |

Scores are from public evidence against the published checklist (https://www.anchorterminal.com/benchmark/), with Performance and Task success pending. p95 latency and context cost come from our probes, which haven't run yet.

## Summaries

### 161. Dropbox Sign, B (68.9)

Dropbox Sign (formerly HelloSign) is Dropbox's e-signature service. Its REST API sends documents or templates for signature, embeds signing in an iframe, reports status by webhook and returns signed PDFs with an audit trail. A public OpenAPI 3.0.3 spec, llms.txt, six official SDKs and a free test mode let an agent build the whole flow before paying. Production sends need a paid plan from $900 a year, the API key has full account access, and no idempotency keys were found in the reviewed documentation.

- Page: https://www.anchorterminal.com/tools/dropbox-sign · Markdown: https://www.anchorterminal.com/tools/dropbox-sign.md · JSON: https://www.anchorterminal.com/api/v1/tools/dropbox-sign.json
- Capabilities: esign.send, esign.templates, esign.embed, esign.status · endpoint: `https://api.hellosign.com/v3`

### 168. airSlate SignNow, B (68.5)

airSlate SignNow is an e-signature service. Its REST API prepares documents from templates, sends signature invites, embeds signing in other apps and reports status through webhooks. A hosted MCP server gives AI agents 20 documented tools over the same account. The REST API has a public OpenAPI 3.0 spec with 354 operations, Markdown docs, a free Development mode with 500 invites and a hosted MCP server with OAuth. API keys don't expire and carry full account access, no idempotency keys were found, and the MCP server's GitHub repository was archived when checked on 7 October 2026.

- Page: https://www.anchorterminal.com/tools/signnow · Markdown: https://www.anchorterminal.com/tools/signnow.md · JSON: https://www.anchorterminal.com/api/v1/tools/signnow.json
- Capabilities: esign.send, esign.templates, esign.embed, esign.status, contracts.generate, pdf.forms · endpoint: `https://api.signnow.com`

### 287. PandaDoc, B (63.1)

PandaDoc is a document platform for proposals, quotes, contracts and e-signatures. Its REST API and hosted MCP server create documents from templates, send them for signature, embed signing sessions and report status through webhooks. The public OpenAPI spec lists 133 operations and reached version 8.21.0 on 2 October 2026, and the hosted MCP server, with OAuth and dynamic client registration, is open to every plan including Free. The status page records three incidents affecting document creation, sending or the API between 15 July and 6 September 2026, and writes have no idempotency keys.

- Page: https://www.anchorterminal.com/tools/pandadoc · Markdown: https://www.anchorterminal.com/tools/pandadoc.md · JSON: https://www.anchorterminal.com/api/v1/tools/pandadoc.json
- Capabilities: esign.send, esign.templates, esign.embed, esign.status, contracts.generate · endpoint: `https://api.pandadoc.com/public/v1`

### 294. Documenso, B (62.8)

Open-source document signing platform from Documenso, Inc., self-hosted under AGPL-3.0 or used as a hosted cloud. Its REST API creates envelopes from PDFs or templates, sends them to recipients, reports status by webhook and returns the signed file. The v2 REST API has a public OpenAPI 3.0.3 spec of 89 operations, a free plan with API access, and envelope audit logs and signing certificates by API. API tokens carry full access to one team with no narrower scopes, and writes take no idempotency key. A high-severity advisory on 2 October 2026 exposed user names and emails.

- Page: https://www.anchorterminal.com/tools/documenso · Markdown: https://www.anchorterminal.com/tools/documenso.md · JSON: https://www.anchorterminal.com/api/v1/tools/documenso.json
- Capabilities: esign.send, esign.templates, esign.status, esign.embed · endpoint: `https://app.documenso.com/api/v2`

### 301. Docusign, B (62.5)

Docusign is an e-signature and agreement management service. Its eSignature REST API creates envelopes from documents or templates, sends them to signers, embeds signing in an app and reports status. A hosted MCP server exposes a subset as tools. The eSignature REST API has public Swagger and OpenAPI files on GitHub, OAuth 2.0, a free developer sandbox and Connect webhooks, and the MCP server reached general availability on 30 September 2026. Production needs a paid plan from $50 a month and a Go-Live review, and the status site lists 34 incidents since 9 July 2026.

- Page: https://www.anchorterminal.com/tools/docusign · Markdown: https://www.anchorterminal.com/tools/docusign.md · JSON: https://www.anchorterminal.com/api/v1/tools/docusign.json
- Capabilities: esign.send, esign.templates, esign.embed, esign.status, contracts.generate · endpoint: `https://mcp.docusign.com/mcp`

## How we test 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. This test hasn't run yet, so Task success is pending and the grades here come from the categories assessed from public evidence.