API pricing comparison · 25¢ per envelope · No monthly fee

DocuSign API pricing vs. a flat 25¢ per envelope

Try it on 25 free documents before you weigh up DocuSign API pricing at all. After that, 25¢ per envelope with no seats and no minimum, sent by email and text in one call.

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Next to the market

	Per envelope	SMS delivery	Monthly fee
Siglio	25¢	Yes, included	None
eSignatures.com	49¢	Yes, 9¢ extra per text	None
Documenso	Not published	Not mentioned	$25 to $250/mo, or self-host
DocuSign	Not published	Not on the Starter or Intermediate API plans; eSignature add-on from $0.36 per delivery	$50 to $480/mo (API plans)
Adobe Acrobat Sign	Not published	Not published	Not published for API tiers
PandaDoc API	Not published	Email or SMS listed, price not published	$40/mo Developer plan, 40 documents

Each company’s figures are from its own published pricing page, linked from its name, checked 7 October 2026. DocuSign’s SMS add-on is from its eSignature plans page; its API plans list SMS as “Does Not Include” on Starter and Intermediate. Adobe’s Acrobat Sign API FAQ says API access is “reserved exclusively for enterprise and developer tier accounts” and prices neither. Documenso’s page does not mention SMS. “Not published” means the page does not state it. Prices change; check the source before relying on it. Longer comparisons: DocuSign, PandaDoc, Adobe Sign.

# Tag the PDF with ^S1 where they sign, then:
B64=$(base64 < agreement.pdf | tr -d '\n')

curl -X POST https://api.esigndev.com/v1/envelopes \
  -H "Authorization: Bearer sig_..." \
  -H "Idempotency-Key: order-41882-contract-1" \
  -H "Content-Type: application/json" \
  -d '{
    "document_name": "Roof replacement agreement",
    "document_base64": "'"$B64"'",
    "delivery": "both",
    "signer": {
      "name":  "Jane Smith",
      "email": "jane@example.com",
      "phone": "+18135551212"
    }
  }'

# POST to your webhook endpoint when the last signature is in
{
  "id": "evt_8f3k2m9q1x",
  "type": "envelope.completed",
  "occurred_at": "2026-09-28T15:04:11.482Z",
  "data": {
    "envelope": {
      "id": "env_k7m2v9x3q1",
      "state": "completed",
      "document_name": "Roof replacement agreement",
      "delivery": "both",
      "signer": {
        "name": "Jane Smith",
        "signed_at": "2026-09-28T15:04:09Z"
      },
      "completed_at": "2026-09-28T15:04:09Z"
    }
  }
}

# then fetch the signed PDF, certificate included:
curl https://api.esigndev.com/v1/envelopes/env_k7m2v9x3q1/document \
  -H "Authorization: Bearer sig_..." -o signed.pdf

One POST creates the envelope and sends it. Bearer token, no JWT, no consent screen. The webhook body is trimmed to the fields you act on; the full shape is in the docs.

25¢

per envelope, flat at every volume. No monthly fee, no seats

SMS

and email, or both, in one API call, included in the 25 cents

ESIGN

and UETA, with a certificate page for each signer on every signed PDF

30 days

signed copies are kept after the envelope closes, then deleted

Published figures

Monthly plan and included envelopes, next to one per-envelope rate

	Siglio	DocuSign Developer Starter	DocuSign Developer Intermediate
Price per envelope	25¢	Not published	Not published
Monthly fee	$0	$50	$300
Per-seat fee	$0	Not published	Not published
Minimum commitment	$0	Not published	Not published
SMS delivery	Included at the same 25¢	“Does Not Include”	“Does Not Include”
Free trial access	Key on screen in about a minute. No card, no account review.	Free developer account, no card	Free developer account, no card
Webhook on every event	Every event type, every account	Not published	Not published
Multi-signer	Two per envelope; signer two is notified after signer one finishes	Not published	Not published

DocuSign figures are quoted from DocuSign's published developer plans page and eSignature plans page, checked on 7 October 2026. Envelope allowances are quoted as “Starting amount of 40 envelopes/month” and “Starting amount of 100 envelopes/month”; the price of an envelope beyond the allowance is not stated on either page. Sandbox wording is theirs: “Developer accounts operate in a Docusign non-production (demo) environment. They have most enterprise features enabled by default and don't expire.” A cell reading “Not published” is not stated on those pages, which is not the same as saying it does not exist. On the eSignature side, SMS delivery is sold as an add-on “Starting at $0.36/delivery”, added to a Standard or Business Pro plan. Prices change; check the source before relying on it.

What 100, 1,000 and 10,000 envelopes cost

Envelopes in a month	Siglio	DocuSign developer plans
40	$10.00	$50.00 on Starter, which includes 40
100	$25.00	$300.00 on Intermediate, which includes 100
1,000	$250.00	Not published
10,000	$2,500.00	Not published

The DocuSign column names the cheapest published plan whose included allowance covers that month, at its published monthly price. Above 100 envelopes a month neither published plan states an allowance or an overage rate, so there is no number to put there. Siglio is the same 25¢ on every row.

Switching

Moving a small integration over

Auth is a Bearer token in the Authorization header. No JWT and no consent screen.
One POST creates and sends the envelope: the PDF, the signer, and delivery by email, text or both.
Webhooks are on every account, for every event type. Point one endpoint at them.
The signed PDF comes back by id. On envelope.completed, download it by the envelope id and keep your copy: Siglio deletes it 30 days after completion.

How it works

How the e-signature API works on this side

The reason the price can be one number is that there is nothing else to charge for: no seats to license, no tier to graduate into, and no SMS add-on.

Tag the PDF

Put ^S1 where the signature goes and ^D1 where the date goes, in white text. Invisible to the reader, findable by us.

POST it

One JSON request with the file and the signer. Delivery by email, text or both starts immediately.

Get the webhook

envelope.completed lands on your endpoint with the envelope id. Download the signed PDF, certificate included, and keep it.

Pricing

What it costs

What	Siglio
Per envelope	25¢
Monthly fee	$0
Per seat	$0
Minimum	$0
SMS delivery	Included, same 25¢
Free trial	25 free documents, no card

You are billed when an envelope is created, not when it is signed. A declined or ignored envelope still costs 25¢.

Legal standing

Legally binding, with the record to show it

ESIGN ActFederal, 15 U.S.C. §7001 UETA49 states, D.C., Puerto Rico, U.S.V.I.

Electronic signatures have carried the same legal force as ink in the United States since 2000, under the federal ESIGN Act and, at state level, the Uniform Electronic Transactions Act. Every signed PDF carries a certificate page per signer with the sent, viewed and signed times and the IP address each came from. How the record holds up.

Questions

Reading the comparison honestly

Where do these DocuSign numbers come from?

DocuSign’s own published plan pages, linked under the table, checked on 7 October 2026. We quote what those pages state and mark anything they do not state as not published. Prices change, so check the source before you rely on it.

How does 25¢ compare to a plan?

There is no plan to compare. 25¢ per envelope, flat, at every volume, with no tiers. $0 monthly fee, $0 per seat and $0 minimum, so your monthly envelopes times 25¢ is the bill.

Do I need a consent screen?

No. Every call carries a Bearer token. No JWT and no consent screen. Your API key is on screen in about a minute, with no account review, and the 25 free documents deliver to real inboxes and real phones.

Is SMS extra?

No. Email and text go out in the same API call at the same 25¢. There is no SMS surcharge.

Is it legally binding?

Yes. Electronic signatures carry the same legal force as ink in the United States under the federal ESIGN Act and state UETA. Every signed PDF includes a certificate page per signer with the timestamps and IP addresses. More on the law.

What are the limits?

Two signers per envelope, signer one first: signer two is notified only after signer one signs. PDF only, up to 15 MB. Signed documents are deleted 30 days after completion, so download the signed PDF by id on the completion webhook and keep it.

Run the numbers on your own volume

Multiply your monthly envelopes by 25¢. That is the invoice. Start with 25 free documents and no card.

Continue with Google

or use your work email

You get your API key on the next screen. Real delivery, not a simulation.

Check your email

We sent a sign-in link to . It is good for 15 minutes, and your API key is waiting on the other side.