diff --git a/api/controllers/blocks.js b/api/controllers/blocks.js
index 919f8990..97c6bbb7 100644
--- a/api/controllers/blocks.js
+++ b/api/controllers/blocks.js
@@ -68,6 +68,13 @@ Blocks.list = function(req, res) {
   var to = parseInt(req.query.to || 1e6);
   var offset = parseInt(req.query.offset || 0);
   var limit = parseInt(req.query.limit || 10);
+
+  if (to < from) {
+    res.status(422);
+    res.send('/v1/blocks/ "to" must be >= to "from"');
+    return;
+  }
+
   node.listBlocks(from, to, offset, limit)
     .then(function(blocks) {
       res.send(blocks);
diff --git a/api/test/v1/blocks.js b/api/test/v1/blocks.js
index 226ff2af..16ba48f0 100644
--- a/api/test/v1/blocks.js
+++ b/api/test/v1/blocks.js
@@ -35,6 +35,7 @@ describe('BitcoreHTTP v1 blocks routes', function() {
     return mockBlocks[hash];
   };
   var last3 = Object.keys(mockBlocks).splice(-3).map(blockForHash);
+  var some2 = Object.keys(mockBlocks).splice(2,2).map(blockForHash);
   var nodeMock, app, agent;
   var blockList = Object.values(mockBlocks);
   beforeEach(function() {
@@ -72,6 +73,11 @@ describe('BitcoreHTTP v1 blocks routes', function() {
         .expect(200)
         .expect(JSON.stringify(blockList), cb);
     });
+    it('fails with to<from', function(cb) {
+      agent.get('/v1/blocks/?from=100000&to=99999')
+        .expect(422)
+        .expect('/v1/blocks/ "to" must be >= to "from"', cb);
+    });
     it('works with to/from parameters', function(cb) {
       agent.get('/v1/blocks/?from=100000&to=100001')
         .expect(200)
@@ -87,6 +93,11 @@ describe('BitcoreHTTP v1 blocks routes', function() {
         .expect(200)
         .expect(JSON.stringify(last3), cb);
     });
+    it('works with all parameters 2', function(cb) {
+      agent.get('/v1/blocks/?from=100000&to=100005&limit=2&offset=2')
+        .expect(200)
+        .expect(JSON.stringify(some2), cb);
+    });
   });
   describe('/blocks/latest', function() {
     it('returns latest block', function(cb) {