diff --git a/bin/rlint.js b/bin/rlint.js
new file mode 100755
index 000000000..9b37668d8
--- /dev/null
+++ b/bin/rlint.js
@@ -0,0 +1,159 @@
+#!/usr/bin/node
+
+var async       = require('async');
+var Remote      = require('../src/js/remote').Remote;
+var Transaction = require('../src/js/transaction').Transaction;
+var UInt160     = require('../src/js/uint160').UInt160;
+var Amount      = require('../src/js/amount').Amount;
+
+var book_key = function (book) {
+  return book.taker_pays.currency
+    + ":" + book.taker_pays.issuer
+    + ":" + book.taker_gets.currency
+    + ":" + book.taker_gets.issuer;
+};
+
+var book_key_cross = function (book) {
+  return book.taker_gets.currency
+    + ":" + book.taker_gets.issuer
+    + ":" + book.taker_pays.currency
+    + ":" + book.taker_pays.issuer;
+};
+
+var ledger_verify = function (ledger) {
+  var dir_nodes = ledger.accountState.filter(function (entry) {
+      return entry.LedgerEntryType === 'DirectoryNode'    // Only directories
+        && entry.index === entry.RootIndex                // Only root nodes
+        && 'TakerGetsCurrency' in entry;                  // Only offer directories
+    });
+
+  var books = {};
+
+  dir_nodes.forEach(function (node) {
+      var book = {
+        taker_gets: {
+            currency: UInt160.from_generic(node.TakerGetsCurrency).to_json(),
+            issuer: UInt160.from_generic(node.TakerGetsIssuer).to_json()
+          },
+        taker_pays: {
+          currency: UInt160.from_generic(node.TakerPaysCurrency).to_json(),
+          issuer: UInt160.from_generic(node.TakerPaysIssuer).to_json()
+        },
+        quality: Amount.from_quality(node.RootIndex)
+      };
+
+      books[book_key(book)] = book;
+
+//      console.log(JSON.stringify(node, undefined, 2));
+    });
+
+//  console.log(JSON.stringify(dir_entry, undefined, 2));
+  console.log("#%s books: %s", ledger.ledger_index, Object.keys(books).length);
+
+  Object.keys(books).forEach(function (key) {
+      var book        = books[key];
+      var key_cross   = book_key_cross(book);
+      var book_cross  = books[key_cross];
+
+      if (book && book_cross && !book_cross.done)
+      {
+        var book_cross_quality_inverted = Amount.from_json("1.0/1/1").divide(book_cross.quality);
+
+        if (book_cross_quality_inverted.compareTo(book.quality) > 0)
+        {
+          console.log("crossing: #%s :: %s :: %s :: %s", ledger.ledger_index, key, book.quality.to_text(), book_cross.quality.to_text());
+        }
+
+        book_cross.done = true;
+      }
+    });
+};
+
+var ledger_request = function (remote, ledger_index, done) {
+ remote.request_ledger(undefined, {
+      accounts: true,
+      expand: true,
+    })
+  .ledger_index(ledger_index)
+  .on('success', function (m) {
+      // console.log("ledger: ", ledger_index);
+      // console.log("ledger: ", JSON.stringify(m, undefined, 2));
+      done(m.ledger);
+    })
+  .on('error', function (m) {
+      console.log("error");
+      done();
+    })
+  .request();
+};
+
+var usage = function () {
+  console.log("rlint.js _websocket_ip_ _websocket_port_ ");
+};
+
+var finish = function (remote) {
+  remote.disconnect();
+
+  // XXX Because remote.disconnect() doesn't work:
+  process.exit();
+};
+
+console.log("args: ", process.argv.length);
+console.log("args: ", process.argv);
+
+if (process.argv.length < 4) {
+  usage();
+}
+else {
+  var remote  = Remote.from_config({
+        websocket_ip:   process.argv[2],
+        websocket_port: process.argv[3],
+      })
+    .once('ledger_closed', function (m) {
+        console.log("ledger_closed: ", JSON.stringify(m, undefined, 2));
+
+        if (process.argv.length === 5) {
+          var ledger_index  = process.argv[4];
+
+          ledger_request(remote, ledger_index, function (l) {
+              if (l) {
+                ledger_verify(l);
+              }
+
+              finish(remote);
+            });
+
+        } else if (process.argv.length === 6) {
+          var ledger_start  = Number(process.argv[4]);
+          var ledger_end    = Number(process.argv[5]);
+          var ledger_cursor = ledger_end;
+
+          async.whilst(
+            function () {
+              return ledger_start <= ledger_cursor && ledger_cursor <=ledger_end;
+            },
+            function (callback) {
+              // console.log(ledger_cursor);
+
+              --ledger_cursor;
+
+              ledger_request(remote, ledger_cursor, function (l) {
+                  if (l) {
+                    ledger_verify(l);
+                  }
+
+                  callback();
+                });
+            },
+            function (error) {
+              finish(remote);
+            });
+
+        } else {
+          finish(remote);
+        }
+      })
+    .connect();
+}
+
+// vim:sw=2:sts=2:ts=8:et