diff --git a/src/controllers/write/posts.js b/src/controllers/write/posts.js
index 116ab5a38f..12c816e7c3 100644
--- a/src/controllers/write/posts.js
+++ b/src/controllers/write/posts.js
@@ -1,11 +1,40 @@
 'use strict';
 
+const nconf = require('nconf');
+
+const db = require('../../database');
+const topics = require('../../topics');
 const posts = require('../../posts');
 const api = require('../../api');
 const helpers = require('../helpers');
 
 const Posts = module.exports;
 
+Posts.redirectByIndex = async (req, res, next) => {
+	const { tid } = req.query || req.body;
+
+	let { index } = req.params;
+	if (index < 0 || !isFinite(index)) {
+		index = 0;
+	}
+	index = parseInt(index, 10);
+
+	let pid;
+	if (index === 0) {
+		pid = await topics.getTopicField(tid, 'mainPid');
+	} else {
+		pid = await db.getSortedSetRange(`tid:${tid}:posts`, index - 1, index - 1);
+	}
+	pid = Array.isArray(pid) ? pid[0] : pid;
+	if (!pid) {
+		return next('route');
+	}
+
+	const path = req.path.split('/').slice(3).join('/');
+	const urlObj = new URL(nconf.get('url') + req.url);
+	res.redirect(308, nconf.get('relative_path') + encodeURI(`/api/v3/posts/${pid}/${path}${urlObj.search}`));
+};
+
 Posts.get = async (req, res) => {
 	const post = await api.posts.get(req, { pid: req.params.pid });
 	if (!post) {
diff --git a/src/middleware/index.js b/src/middleware/index.js
index a92501a7b9..0c44b5cfaf 100644
--- a/src/middleware/index.js
+++ b/src/middleware/index.js
@@ -270,7 +270,7 @@ middleware.validateAuth = helpers.try(async (req, res, next) => {
 
 middleware.checkRequired = function (fields, req, res, next) {
 	// Used in API calls to ensure that necessary parameters/data values are present
-	const missing = fields.filter(field => !req.body.hasOwnProperty(field));
+	const missing = fields.filter(field => !req.body.hasOwnProperty(field) && !req.query.hasOwnProperty(field));
 
 	if (!missing.length) {
 		return next();
diff --git a/src/routes/write/posts.js b/src/routes/write/posts.js
index 55c2202ac1..634ba23cdd 100644
--- a/src/routes/write/posts.js
+++ b/src/routes/write/posts.js
@@ -34,5 +34,8 @@ module.exports = function () {
 	setupApiRoute(router, 'put', '/:pid/diffs/:since', middlewares, controllers.write.posts.restoreDiff);
 	setupApiRoute(router, 'delete', '/:pid/diffs/:timestamp', middlewares, controllers.write.posts.deleteDiff);
 
+	// Shorthand route to access post routes by topic index
+	router.all('/+byIndex/:index*?', [middleware.checkRequired.bind(null, ['tid'])], controllers.write.posts.redirectByIndex);
+
 	return router;
 };