Sent-message evidence, as an API.

Create and send messages from your own software, attach secure files, tag everything with your own IDs, and pull back a verifiable ledger — the same records your users see in the web app.

Base URL https://sentledger.com/v1 · OpenAPI 3.1 spec

curl https://sentledger.com/v1/messages \
  -H "Authorization: Bearer $SENTLEDGER_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: order-A-1001-estimate" \
  -d '{"to":["recipient@example.com"],"subject":"Your estimate","html":"<p>Hi {{name}}, your estimate is ready.</p>","variables":{"name":"Alex"},"metadata":{"order_id":"A-1001"},"send":true}'

const res = await fetch("https://sentledger.com/v1/messages", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.SENTLEDGER_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": "order-A-1001-estimate",
  },
  body: JSON.stringify({
    to: ["recipient@example.com"],
    subject: "Your estimate",
    html: "<p>Hi {{name}}, your estimate is ready.</p>",
    variables: { name: "Alex" },
    metadata: { order_id: "A-1001" },
    send: true,
  }),
});
const message = await res.json();

// Later: fetch the evidence ledger
const ledger = await fetch(`https://sentledger.com/v1/messages/${message.id}/evidence`, {
  headers: { Authorization: `Bearer ${process.env.SENTLEDGER_API_KEY}` },
}).then((r) => r.json());

import os, requests

r = requests.post(
    "https://sentledger.com/v1/messages",
    headers={
        "Authorization": f"Bearer {os.environ['SENTLEDGER_API_KEY']}",
        "Idempotency-Key": "order-A-1001-estimate",
    },
    json={
        "to": ["recipient@example.com"],
        "subject": "Your estimate",
        "html": "<p>Hi {{name}}, your estimate is ready.</p>",
        "variables": {"name": "Alex"},
        "metadata": {"order_id": "A-1001"},
        "send": True,
    },
)
message = r.json()
ledger = requests.get(
    f"https://sentledger.com/v1/messages/{message['id']}/evidence",
    headers={"Authorization": f"Bearer {os.environ['SENTLEDGER_API_KEY']}"},
).json()

<?php
$ch = curl_init("https://sentledger.com/v1/messages");
curl_setopt_array($ch, [
  CURLOPT_POST => true,
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer " . getenv("SENTLEDGER_API_KEY"),
    "Content-Type: application/json",
    "Idempotency-Key: order-A-1001-estimate",
  ],
  CURLOPT_POSTFIELDS => json_encode([
    "to" => ["recipient@example.com"],
    "subject" => "Your estimate",
    "html" => "<p>Hi {{name}}, your estimate is ready.</p>",
    "variables" => ["name" => "Alex"],
    "metadata" => ["order_id" => "A-1001"],
    "send" => true,
  ]),
]);
$message = json_decode(curl_exec($ch), true);