Affordable E-Signature API for Developers: The True Cost of Integration (2026)

"use server";

interface SendContractParams {
  title: string;
  markdown: string;
  recipientName: string;
  recipientEmail: string;
}

export async function sendContractAction(params: SendContractParams) {
  const apiKey = process.env.SIGNBEE_API_KEY;
  if (!apiKey) throw new Error("Missing SIGNBEE_API_KEY");

  const response = await fetch("https://signb.ee/api/v1/send", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "Authorization": `Bearer ${apiKey}`
    },
    body: JSON.stringify({
      title: params.title,
      markdown: params.markdown,
      recipient_name: params.recipientName,
      recipient_email: params.recipientEmail,
      webhook_url: "https://app.yourdomain.com/api/webhooks/signbee"
    })
  });

  if (!response.ok) {
    const errorText = await response.text();
    return { success: false, error: errorText };
  }

  const data = await response.json();
  return {
    success: true,
    documentId: data.document_id,
    signingUrl: data.signing_url,
    expiresAt: data.expires_at
  };
}

import os
import httpx
from fastapi import FastAPI, HTTPException, BackgroundTasks
from pydantic import BaseModel, EmailStr

app = FastAPI(title="Contract Dispatch Service")
SIGNBEE_API_KEY = os.environ.get("SIGNBEE_API_KEY")

class ContractRequest(BaseModel):
    title: str
    markdown_content: str
    recipient_name: str
    recipient_email: EmailStr

@app.post("/contracts/dispatch")
async def dispatch_contract(req: ContractRequest):
    if not SIGNBEE_API_KEY:
        raise HTTPException(status_code=500, detail="Signbee API key not configured")
        
    payload = {
        "title": req.title,
        "markdown": req.markdown_content,
        "recipient_name": req.recipient_name,
        "recipient_email": req.recipient_email,
        "webhook_url": "https://api.yourdomain.com/webhooks/signbee"
    }

    async with httpx.AsyncClient() as client:
        res = await client.post(
            "https://signb.ee/api/v1/send",
            headers={
                "Authorization": f"Bearer {SIGNBEE_API_KEY}",
                "Content-Type": "application/json"
            },
            json=payload,
            timeout=10.0
        )
        
    if res.status_code != 200:
        raise HTTPException(status_code=res.status_code, detail=res.text)
        
    return res.json()