SMS e-signature API. Send a contract by text with one call.

# agreement.pdf has ^S1 in white text where Jordan signs
B64=$(base64 < agreement.pdf | tr -d '\n')

curl https://api.esigndev.com/v1/envelopes \
  -H "Authorization: Bearer $SIGLIO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "document_name": "Service agreement",
    "document_base64": "'"$B64"'",
    "delivery": "sms",
    "sender": { "company_name": "Your Company" },
    "signer": { "name": "Jordan Lee", "phone": "+18135551212" }
  }'

// Node 18+, saved as send.mjs
import { readFileSync } from "node:fs";

const res = await fetch("https://api.esigndev.com/v1/envelopes", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.SIGLIO_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    document_name: "Service agreement",
    document_base64: readFileSync("agreement.pdf").toString("base64"),
    delivery: "sms",
    sender: { company_name: "Your Company" },
    signer: { name: "Jordan Lee", phone: "+18135551212" },
  }),
});
console.log(res.status, await res.json());

# Python 3 with requests
import base64, os, requests

with open("agreement.pdf", "rb") as f:
    pdf = base64.b64encode(f.read()).decode()

res = requests.post(
    "https://api.esigndev.com/v1/envelopes",
    headers={"Authorization": f"Bearer {os.environ['SIGLIO_API_KEY']}"},
    json={
        "document_name": "Service agreement",
        "document_base64": pdf,
        "delivery": "sms",
        "sender": {"company_name": "Your Company"},
        "signer": {"name": "Jordan Lee", "phone": "+18135551212"},
    },
)
print(res.status_code, res.json())

{
  "id": "env_k7m2v9x3q1",
  "object": "envelope",
  "state": "delivered",
  "document_name": "Service agreement",
  "delivery": "sms",
  "signer": { "name": "Jordan Lee", "email": null,
              "phone": "+18135551212", "signed_at": null },
  "signing_url": "https://esigndev.com/s/q3VbX9tLm2wR...",
  "sender": { "company_name": "Your Company" },
  "created_at": "2026-10-08T14:02:00Z",
  "completed_at": null
}