Posts API reference.

const base = "https://xt4b.com/api/v2/posts";
const headers = { Authorization: "Bearer " + process.env.XT4B_API_KEY };

let offset = 0;
const posts = [];

for (;;) {
  const res = await fetch(base + "?status=published&limit=200&offset=" + offset, {
    headers,
  });

  if (res.status === 429) {
    const wait = Number(res.headers.get("retry-after") || 5);
    await new Promise((resolve) => setTimeout(resolve, wait * 1000));
    continue;
  }
  if (!res.ok) {
    const { error } = await res.json();
    throw new Error(res.status + " " + error.code);
  }

  const { data, pagination } = await res.json();
  posts.push(...data);
  offset += data.length;
  if (data.length === 0 || offset >= pagination.total) break;
}

const res = await fetch(
  "https://xt4b.com/api/v2/posts/slug:" + encodeURIComponent(slug) + "?website=acme.io",
  { headers: { Authorization: "Bearer " + process.env.XT4B_API_KEY } },
);

if (res.status === 404) return null; // not published, or not this account's
const { data: post } = await res.json();
return post.html; // already rendered, links hardened

import os
import requests

base = "https://xt4b.com/api/v2/posts"
headers = {"Authorization": "Bearer " + os.environ["XT4B_API_KEY"]}

since = "2026-09-01T00:00:00Z"
offset, window = 0, []

while True:
    r = requests.get(
        base,
        headers=headers,
        params={"status": "published", "limit": 200, "offset": offset},
        timeout=30,
    )
    r.raise_for_status()
    body = r.json()

    for post in body["data"]:
        if post["publishedAt"] and post["publishedAt"] >= since:
            window.append(post)

    offset += len(body["data"])
    if not body["data"] or offset >= body["pagination"]["total"]:
        break

print(len(window), "posts published since", since)