First 25 signings free, then 25¢ each. No monthly fee.
No monthly fee, no seats, no minimum, no contract. Text and email delivery in the same 25 cents. Your first 25 documents are free and need no card.
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.
No card, no catch. Real delivery to real phones and inboxes, not a simulation. They never expire and they do not refill.
Flat. Every envelope, at every volume. 25 cents at ten a month, 25 cents at a hundred thousand. No tiers, no negotiated rates, no annual commit.
No monthly fee, seat fee or platform fee. A month where you send nothing costs nothing. There are no seats and no per-user pricing.
You are billed when an envelope is created, not when it is signed. If your signer declines, ignores it, or you void it, it still cost 25 cents. A request that fails validation is never charged, because no envelope was created.
Pay as you go
25¢
per envelope. Your first 25 are free, no card.
Enterprise
Talk to us
Everything in pay as you go, plus:
Data collection before signing. The signer types in the details your document needs, then signs once, and every answer lands on the document and in your system.
Two signers on one document is still one envelope. Text and email to the same signer is still one envelope. The first 25 are free once, not every month. Nothing here is stored or sent anywhere.
| What | Siglio |
|---|---|
| Per envelope | 25¢ |
| Monthly fee | $0 |
| Per seat | $0 |
| Minimum or contract | None |
| Text (SMS) delivery | Included, same 25¢ |
| Email delivery | Included |
| Both channels to one signer, in parallel | Included, still one envelope |
| Two signers on one document | Included, still one envelope |
| Signed webhooks | Included |
| Document studio (send without code) | Included |
| Collecting a payment with a document | Included; Stripe's card fees apply, charged by Stripe to your account |
| Asking the signer for files (ID, insurance, W-9) | Included |
| Free trial | 25 documents free, no card, shared by the API and the studio; 25¢ each after that |
A signed envelope, a declined one and a voided one all cost the same 25 cents. What you are paying for is the send. Collecting a payment with a document costs nothing extra from Siglio: the money goes to your own Stripe account, and Stripe's standard card fees are charged by Stripe to that account. Asking the signer for files costs nothing extra either. A document held for a payment or files before signing is not billed until it goes out.
| 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.
When the 25 free documents are used up. Until then there is nothing to enter. Then you add a card and your business details in one step, keep the same key, and every envelope after that is 25 cents. Add a card early if you like: you still get the rest of your free ones first.
Monthly, on the anniversary of the day you activated paid billing. Activate on the 14th and you are invoiced on the 14th of every month. If your day does not exist in a month, it bills on that month's last day. You keep a primary card and a backup card; if the primary fails, the backup is charged.
Every account has an approved monthly envelope limit, which you set from your own estimate when you activate paid usage and can raise yourself up to 10,000 a month. You can also set a lower cap of your own; that one is a hard stop, and you can lift it in one click. Above 10,000 a month, a person approves the increase.
The envelope still cost 25 cents, because it was created and delivered. That is why the first 25 are free: get the flow right on those, then send the envelopes you actually intend to send. Use an idempotency key so a retried request cannot create and bill two envelopes.
No. Use four today and the other 21 are there in six months. They do not refill either; it is a one-time allowance per account.
There are no plans. One rate, per envelope, billed monthly on what you sent. If you need something a per-envelope rate cannot express, write through the contact form and say what it is.
API key in a minute, real delivery, no card. When your integration works on a free one, you have seen the thing your users will see.
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