Category · Work & business apps
Contract, proposal and e-signature APIs for AI agents
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.
Capability keys esign.send · esign.templates · esign.embed · esign.status · contracts.generate · All tools
letme.dev/esign.send picks the top-graded tool in this list and says how to call it direct; calling through letme comes later.
The same listing from the live API. Graded results come first, then the official MCP registry when no graded-only filter is set.
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| Compare | # | Tool | Category | Grade | Score | Agent rating | p95 | Context | Price / x402 | Auth | Where | Details |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 141 | Dropbox SignDropbox, Inc. · HTTP API | E-signatures | B | 68.9 | none | n/a | n/a | Paid | OAuth or key | Hosted | ||
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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. Top strength Public OpenAPI 3.0.3 spec with 74 operations, plus llms.txt and a Markdown copy of every docs page Top weakness No idempotency keys found in the docs or the spec, so a retried send can create a second signature request |
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| 148 | airSlate SignNowairSlate, Inc. · HTTP API | E-signatures | B | 68.5 | none | n/a | n/a | $2 / tx | OAuth or key | Hosted + local | ||
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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. Top strength Public OpenAPI 3.0.3 spec with 354 operations, 342 of them with examples, plus llms.txt and a Markdown copy of every docs page Top weakness API keys don't expire and work for all API requests. Narrower access needs an OAuth token requested with a URL-pattern scope |
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| 257 | PandaDocPandaDoc · HTTP API | E-signatures | B | 63.1 | none | n/a | n/a | Freemium | OAuth or key | Hosted | ||
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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. Top strength Public OpenAPI 3.0.3 spec with 133 operations, version 8.21.0 on 2 October 2026, plus llms.txt and a Markdown copy of each docs page Top weakness Three incidents hit document creation, sending or the API between 15 July and 6 September 2026, the longest about 3.5 hours |
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| 264 | DocumensoDocumenso, Inc. · HTTP API | E-signatures | B | 62.8 | none | n/a | n/a | Freemium | API key | Hosted | ||
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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. Top strength Public OpenAPI 3.0.3 spec for the v2 API with 89 operations, plus llms.txt and a 1 MB llms-full.txt Top weakness API tokens grant full access to one team. No read-only or per-resource scopes were found in the reviewed documentation |
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| 270 | DocusignDocusign, Inc. · HTTP API | E-signatures | B | 62.5 | none | n/a | n/a | $50 / mo | OAuth | Hosted | ||
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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. Top strength Public Spec files under MIT on GitHub for eSignature v2.1 (213 paths, 414 operations) and ten other APIs Top weakness health.docusign.com lists 34 incidents since 9 July 2026, including a two-hour NA4 disruption on 30 July and email notification failures from 25 to 30 September |
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Nothing matches these filters. .
p95 latency and context cost come from our probes, which haven't run yet, so those columns start hidden. Grades run from AA to F, and agent-ready means BB or better. Filters, sorting and export run in your browser; the table is complete without JavaScript.
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.
How the ranking works
Every listing is scored 0 to 100 and given a grade from AA to F. In the October 2026 research run, 7 of the 9 weighted categories are scored from public evidence (status history, docs, pricing, terms, source and security pages) against a published checklist, with the reason and sources for every score on the listing. Performance and Task success wait for our probes and task suites, so their weight is shared across the rest until they run. Negative events deduct up to 15 points. Read the methodology.
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