diff --git a/lib/httprpc.js b/lib/httprpc.js
index 99f02b532..8141a6bae 100644
--- a/lib/httprpc.js
+++ b/lib/httprpc.js
@@ -21,74 +21,73 @@
  * @date 2014
  */
 
-if(process.env.NODE_ENV !== "build") {
+if (process.env.NODE_ENV !== "build") {
     var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest; // jshint ignore:line
 }
 
+var HttpRpcProvider = function (host) {
+    this.handlers = [];
+    this.host = host;
+};
 
-    var HttpRpcProvider = function (host) {
-        this.handlers = [];
-        this.host = host;
+function formatJsonRpcObject(object) {
+    return {
+        jsonrpc: '2.0',
+        method: object.call,
+        params: object.args,
+        id: object._id
     };
+}
 
-    function formatJsonRpcObject(object) {
-        return {
-            jsonrpc: '2.0',
-            method: object.call,
-            params: object.args,
-            id: object._id
-        };
-    }
-
-    function formatJsonRpcMessage(message) {
-        var object = JSON.parse(message);
-
-        return {
-            _id: object.id,
-            data: object.result,
-            error: object.error
-        };
-    }
-
-    HttpRpcProvider.prototype.sendRequest = function (payload, cb) {
-        var data = formatJsonRpcObject(payload);
+function formatJsonRpcMessage(message) {
+    var object = JSON.parse(message);
 
-        var request = new XMLHttpRequest();
-        request.open("POST", this.host, true);
-        request.send(JSON.stringify(data));
-        request.onreadystatechange = function () {
-            if (request.readyState === 4 && cb) {
-                cb(request);
-            }
-        };
+    return {
+        _id: object.id,
+        data: object.result,
+        error: object.error
     };
+}
 
-    HttpRpcProvider.prototype.send = function (payload) {
-        var self = this;
-        this.sendRequest(payload, function (request) {
-            self.handlers.forEach(function (handler) {
-                handler.call(self, formatJsonRpcMessage(request.responseText));
-            });
-        });
+HttpRpcProvider.prototype.sendRequest = function (payload, cb) {
+    var data = formatJsonRpcObject(payload);
+
+    var request = new XMLHttpRequest();
+    request.open("POST", this.host, true);
+    request.send(JSON.stringify(data));
+    request.onreadystatechange = function () {
+        if (request.readyState === 4 && cb) {
+            cb(request);
+        }
     };
+};
 
-    HttpRpcProvider.prototype.poll = function (payload, id) {
-        var self = this;
-        this.sendRequest(payload, function (request) {
-            var parsed = JSON.parse(request.responseText);
-            if (parsed.error || (parsed.result instanceof Array ? parsed.result.length === 0 : !parsed.result)) {
-                return;
-            }
-            self.handlers.forEach(function (handler) {
-                handler.call(self, {_event: payload.call, _id: id, data: parsed.result});
-            });
+HttpRpcProvider.prototype.send = function (payload) {
+    var self = this;
+    this.sendRequest(payload, function (request) {
+        self.handlers.forEach(function (handler) {
+            handler.call(self, formatJsonRpcMessage(request.responseText));
         });
-    };
+    });
+};
 
-    Object.defineProperty(HttpRpcProvider.prototype, "onmessage", {
-        set: function (handler) {
-            this.handlers.push(handler);
+HttpRpcProvider.prototype.poll = function (payload, id) {
+    var self = this;
+    this.sendRequest(payload, function (request) {
+        var parsed = JSON.parse(request.responseText);
+        if (parsed.error || (parsed.result instanceof Array ? parsed.result.length === 0 : !parsed.result)) {
+            return;
         }
+        self.handlers.forEach(function (handler) {
+            handler.call(self, {_event: payload.call, _id: id, data: parsed.result});
+        });
     });
+};
+
+Object.defineProperty(HttpRpcProvider.prototype, "onmessage", {
+    set: function (handler) {
+        this.handlers.push(handler);
+    }
+});
 
 module.exports = HttpRpcProvider;
diff --git a/lib/main.js b/lib/main.js
index 52fa790b4..d751f8527 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -22,136 +22,169 @@
  * @date 2014
  */
 
-    function flattenPromise (obj) {
-        if (obj instanceof Promise) {
-            return Promise.resolve(obj);
-        }
-
-        if (obj instanceof Array) {
-            return new Promise(function (resolve) {
-                var promises = obj.map(function (o) {
-                    return flattenPromise(o);
-                });
+function flattenPromise (obj) {
+    if (obj instanceof Promise) {
+        return Promise.resolve(obj);
+    }
 
-                return Promise.all(promises).then(function (res) {
-                    for (var i = 0; i < obj.length; i++) {
-                        obj[i] = res[i];
-                    }
-                    resolve(obj);
-                });
+    if (obj instanceof Array) {
+        return new Promise(function (resolve) {
+            var promises = obj.map(function (o) {
+                return flattenPromise(o);
             });
-        }
- 
-        if (obj instanceof Object) {
-            return new Promise(function (resolve) {
-                var keys = Object.keys(obj);
-                var promises = keys.map(function (key) {
-                    return flattenPromise(obj[key]);
-                });
 
-                return Promise.all(promises).then(function (res) {
-                    for (var i = 0; i < keys.length; i++) {
-                        obj[keys[i]] = res[i];
-                    }
-                    resolve(obj);
-                });
+            return Promise.all(promises).then(function (res) {
+                for (var i = 0; i < obj.length; i++) {
+                    obj[i] = res[i];
+                }
+                resolve(obj);
             });
-        }
-
-        return Promise.resolve(obj);
+        });
     }
 
-    var ethMethods = function () {
-        var blockCall = function (args) {
-            return typeof args[0] === "string" ? "eth_blockByHash" : "eth_blockByNumber";
-        };
+    if (obj instanceof Object) {
+        return new Promise(function (resolve) {
+            var keys = Object.keys(obj);
+            var promises = keys.map(function (key) {
+                return flattenPromise(obj[key]);
+            });
 
-        var transactionCall = function (args) {
-            return typeof args[0] === "string" ? 'eth_transactionByHash' : 'eth_transactionByNumber';   
-        };
+            return Promise.all(promises).then(function (res) {
+                for (var i = 0; i < keys.length; i++) {
+                    obj[keys[i]] = res[i];
+                }
+                resolve(obj);
+            });
+        });
+    }
 
-        var uncleCall = function (args) {
-            return typeof args[0] === "string" ? 'eth_uncleByHash' : 'eth_uncleByNumber';       
-        };
+    return Promise.resolve(obj);
+}
 
-        var methods = [
-        { name: 'balanceAt', call: 'eth_balanceAt' },
-        { name: 'stateAt', call: 'eth_stateAt' },
-        { name: 'countAt', call: 'eth_countAt'},
-        { name: 'codeAt', call: 'eth_codeAt' },
-        { name: 'transact', call: 'eth_transact' },
-        { name: 'call', call: 'eth_call' },
-        { name: 'block', call: blockCall },
-        { name: 'transaction', call: transactionCall },
-        { name: 'uncle', call: uncleCall },
-        { name: 'compile', call: 'eth_compile' },
-        { name: 'lll', call: 'eth_lll' }
-        ];
-        return methods;
+var ethMethods = function () {
+    var blockCall = function (args) {
+        return typeof args[0] === "string" ? "eth_blockByHash" : "eth_blockByNumber";
     };
 
-    var ethProperties = function () {
-        return [
-        { name: 'coinbase', getter: 'eth_coinbase', setter: 'eth_setCoinbase' },
-        { name: 'listening', getter: 'eth_listening', setter: 'eth_setListening' },
-        { name: 'mining', getter: 'eth_mining', setter: 'eth_setMining' },
-        { name: 'gasPrice', getter: 'eth_gasPrice' },
-        { name: 'account', getter: 'eth_account' },
-        { name: 'accounts', getter: 'eth_accounts' },
-        { name: 'peerCount', getter: 'eth_peerCount' },
-        { name: 'defaultBlock', getter: 'eth_defaultBlock', setter: 'eth_setDefaultBlock' },
-        { name: 'number', getter: 'eth_number'}
-        ];
+    var transactionCall = function (args) {
+        return typeof args[0] === "string" ? 'eth_transactionByHash' : 'eth_transactionByNumber';   
     };
 
-    var dbMethods = function () {
-        return [
-        { name: 'put', call: 'db_put' },
-        { name: 'get', call: 'db_get' },
-        { name: 'putString', call: 'db_putString' },
-        { name: 'getString', call: 'db_getString' }
-        ];
+    var uncleCall = function (args) {
+        return typeof args[0] === "string" ? 'eth_uncleByHash' : 'eth_uncleByNumber';       
     };
 
-    var shhMethods = function () {
-        return [
-        { name: 'post', call: 'shh_post' },
-        { name: 'newIdentity', call: 'shh_newIdentity' },
-        { name: 'haveIdentity', call: 'shh_haveIdentity' },
-        { name: 'newGroup', call: 'shh_newGroup' },
-        { name: 'addToGroup', call: 'shh_addToGroup' }
-        ];
+    var methods = [
+    { name: 'balanceAt', call: 'eth_balanceAt' },
+    { name: 'stateAt', call: 'eth_stateAt' },
+    { name: 'countAt', call: 'eth_countAt'},
+    { name: 'codeAt', call: 'eth_codeAt' },
+    { name: 'transact', call: 'eth_transact' },
+    { name: 'call', call: 'eth_call' },
+    { name: 'block', call: blockCall },
+    { name: 'transaction', call: transactionCall },
+    { name: 'uncle', call: uncleCall },
+    { name: 'compile', call: 'eth_compile' },
+    { name: 'lll', call: 'eth_lll' }
+    ];
+    return methods;
+};
+
+var ethProperties = function () {
+    return [
+    { name: 'coinbase', getter: 'eth_coinbase', setter: 'eth_setCoinbase' },
+    { name: 'listening', getter: 'eth_listening', setter: 'eth_setListening' },
+    { name: 'mining', getter: 'eth_mining', setter: 'eth_setMining' },
+    { name: 'gasPrice', getter: 'eth_gasPrice' },
+    { name: 'account', getter: 'eth_account' },
+    { name: 'accounts', getter: 'eth_accounts' },
+    { name: 'peerCount', getter: 'eth_peerCount' },
+    { name: 'defaultBlock', getter: 'eth_defaultBlock', setter: 'eth_setDefaultBlock' },
+    { name: 'number', getter: 'eth_number'}
+    ];
+};
+
+var dbMethods = function () {
+    return [
+    { name: 'put', call: 'db_put' },
+    { name: 'get', call: 'db_get' },
+    { name: 'putString', call: 'db_putString' },
+    { name: 'getString', call: 'db_getString' }
+    ];
+};
+
+var shhMethods = function () {
+    return [
+    { name: 'post', call: 'shh_post' },
+    { name: 'newIdentity', call: 'shh_newIdentity' },
+    { name: 'haveIdentity', call: 'shh_haveIdentity' },
+    { name: 'newGroup', call: 'shh_newGroup' },
+    { name: 'addToGroup', call: 'shh_addToGroup' }
+    ];
+};
+
+var ethWatchMethods = function () {
+    var newFilter = function (args) {
+        return typeof args[0] === 'string' ? 'eth_newFilterString' : 'eth_newFilter';
     };
 
-    var ethWatchMethods = function () {
-        var newFilter = function (args) {
-            return typeof args[0] === 'string' ? 'eth_newFilterString' : 'eth_newFilter';
+    return [
+    { name: 'newFilter', call: newFilter },
+    { name: 'uninstallFilter', call: 'eth_uninstallFilter' },
+    { name: 'getMessages', call: 'eth_getMessages' }
+    ];
+};
+
+var shhWatchMethods = function () {
+    return [
+    { name: 'newFilter', call: 'shh_newFilter' },
+    { name: 'uninstallFilter', call: 'shh_uninstallFilter' },
+    { name: 'getMessage', call: 'shh_getMessages' }
+    ];
+};
+
+var setupMethods = function (obj, methods) {
+    methods.forEach(function (method) {
+        obj[method.name] = function () {
+            return flattenPromise(Array.prototype.slice.call(arguments)).then(function (args) {
+                var call = typeof method.call === "function" ? method.call(args) : method.call;
+                return {call: call, args: args};
+            }).then(function (request) {
+                return new Promise(function (resolve, reject) {
+                    web3.provider.send(request, function (err, result) {
+                        if (!err) {
+                            resolve(result);
+                            return;
+                        }
+                        reject(err);
+                    });
+                });
+            }).catch(function(err) {
+                console.error(err);
+            });
         };
-
-        return [
-        { name: 'newFilter', call: newFilter },
-        { name: 'uninstallFilter', call: 'eth_uninstallFilter' },
-        { name: 'getMessages', call: 'eth_getMessages' }
-        ];
-    };
-
-    var shhWatchMethods = function () {
-        return [
-        { name: 'newFilter', call: 'shh_newFilter' },
-        { name: 'uninstallFilter', call: 'shh_uninstallFilter' },
-        { name: 'getMessage', call: 'shh_getMessages' }
-        ];
-    };
-
-    var setupMethods = function (obj, methods) {
-        methods.forEach(function (method) {
-            obj[method.name] = function () {
-                return flattenPromise(Array.prototype.slice.call(arguments)).then(function (args) {
-                    var call = typeof method.call === "function" ? method.call(args) : method.call;
-                    return {call: call, args: args};
-                }).then(function (request) {
-                    return new Promise(function (resolve, reject) {
-                        web3.provider.send(request, function (err, result) {
+    });
+};
+
+var setupProperties = function (obj, properties) {
+    properties.forEach(function (property) {
+        var proto = {};
+        proto.get = function () {
+            return new Promise(function(resolve, reject) {
+                web3.provider.send({call: property.getter}, function(err, result) {
+                    if (!err) {
+                        resolve(result);
+                        return;
+                    }
+                    reject(err);
+                });
+            });
+        };
+        if (property.setter) {
+            proto.set = function (val) {
+                return flattenPromise([val]).then(function (args) {
+                    return new Promise(function (resolve) {
+                        web3.provider.send({call: property.setter, args: args}, function (err, result) {
                             if (!err) {
                                 resolve(result);
                                 return;
@@ -159,294 +192,261 @@
                             reject(err);
                         });
                     });
-                }).catch(function(err) {
+                }).catch(function (err) {
                     console.error(err);
                 });
             };
-        });
-    };
-
-    var setupProperties = function (obj, properties) {
-        properties.forEach(function (property) {
-            var proto = {};
-            proto.get = function () {
-                return new Promise(function(resolve, reject) {
-                    web3.provider.send({call: property.getter}, function(err, result) {
-                        if (!err) {
-                            resolve(result);
-                            return;
-                        }
-                        reject(err);
-                    });
-                });
-            };
-            if (property.setter) {
-                proto.set = function (val) {
-                    return flattenPromise([val]).then(function (args) {
-                        return new Promise(function (resolve) {
-                            web3.provider.send({call: property.setter, args: args}, function (err, result) {
-                                if (!err) {
-                                    resolve(result);
-                                    return;
-                                }
-                                reject(err);
-                            });
-                        });
-                    }).catch(function (err) {
-                        console.error(err);
-                    });
-                };
-            }
-            Object.defineProperty(obj, property.name, proto);
-        });
-    };
- 
-    var web3 = {
-        _callbacks: {},
-        _events: {},
-        providers: {},
-        toHex: function(str) {
-            var hex = "";
-            for(var i = 0; i < str.length; i++) {
-                var n = str.charCodeAt(i).toString(16);
-                hex += n.length < 2 ? '0' + n : n;
-            }
-
-            return hex;
-        },
-
-        toAscii: function(hex) {
-            // Find termination
-            var str = "";
-            var i = 0, l = hex.length;
-            if (hex.substring(0, 2) === '0x')
-                i = 2;
-            for(; i < l; i+=2) {
-                var code = hex.charCodeAt(i);
-                if(code === 0) {
-                    break;
-                }
-
-                str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
-            }
-
-            return str;
-        },
-
-        toDecimal: function (val) {
-            return parseInt(val, 16);
-        },
-
-        fromAscii: function(str, pad) {
-            pad = pad === undefined ? 32 : pad;
-            var hex = this.toHex(str);
-            while(hex.length < pad*2)
-                hex += "00";
-            return "0x" + hex;
-        },
-
-        eth: {
-            prototype: Object(), // jshint ignore:line
-            watch: function (params) {
-                return new Filter(params, ethWatch);
-            }
-        },
-
-        db: {
-            prototype: Object() // jshint ignore:line
-        },
-
-        shh: {
-            prototype: Object(), // jshint ignore:line
-            watch: function (params) {
-                return new Filter(params, shhWatch);
-            }
-        },
-
-        on: function(event, id, cb) {
-            if(web3._events[event] === undefined) {
-                web3._events[event] = {};
-            }
-
-            web3._events[event][id] = cb;
-            return this;
-        },
+        }
+        Object.defineProperty(obj, property.name, proto);
+    });
+};
+
+var web3 = {
+    _callbacks: {},
+    _events: {},
+    providers: {},
+    toHex: function(str) {
+        var hex = "";
+        for(var i = 0; i < str.length; i++) {
+            var n = str.charCodeAt(i).toString(16);
+            hex += n.length < 2 ? '0' + n : n;
+        }
 
-        off: function(event, id) {
-            if(web3._events[event] !== undefined) {
-                delete web3._events[event][id];
+        return hex;
+    },
+
+    toAscii: function(hex) {
+        // Find termination
+        var str = "";
+        var i = 0, l = hex.length;
+        if (hex.substring(0, 2) === '0x')
+            i = 2;
+        for(; i < l; i+=2) {
+            var code = hex.charCodeAt(i);
+            if(code === 0) {
+                break;
             }
 
-            return this;
-        },
-
-        trigger: function(event, id, data) {
-            var callbacks = web3._events[event];
-            if (!callbacks || !callbacks[id]) {
-                return;
-            }
-            var cb = callbacks[id];
-            cb(data);
+            str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
         }
-    };
-
-    var eth = web3.eth;
-    setupMethods(eth, ethMethods());
-    setupProperties(eth, ethProperties());
-    setupMethods(web3.db, dbMethods());
-    setupMethods(web3.shh, shhMethods());
 
-    var ethWatch = {
-        changed: 'eth_changed'
-    };
-    setupMethods(ethWatch, ethWatchMethods());
-    var shhWatch = {
-        changed: 'shh_changed'
-    };
-    setupMethods(shhWatch, shhWatchMethods());
-
-    var ProviderManager = function() {
-        this.queued = [];
-        this.polls = [];
-        this.ready = false;
-        this.provider = undefined;
-        this.id = 1;
-
-        var self = this;
-        var poll = function () {
-            if (self.provider && self.provider.poll) {
-                self.polls.forEach(function (data) {
-                    data.data._id = self.id;
-                    self.id++;
-                    self.provider.poll(data.data, data.id);
-                });
-            }
-            setTimeout(poll, 12000);
-        };
-        poll();
-    };
-
-    ProviderManager.prototype.send = function(data, cb) {
-        data._id = this.id;
-        if (cb) {
-            web3._callbacks[data._id] = cb;
+        return str;
+    },
+
+    toDecimal: function (val) {
+        return parseInt(val, 16);
+    },
+
+    fromAscii: function(str, pad) {
+        pad = pad === undefined ? 32 : pad;
+        var hex = this.toHex(str);
+        while(hex.length < pad*2)
+            hex += "00";
+        return "0x" + hex;
+    },
+
+    eth: {
+        prototype: Object(), // jshint ignore:line
+        watch: function (params) {
+            return new Filter(params, ethWatch);
         }
+    },
 
-        data.args = data.args || [];
-        this.id++;
+    db: {
+        prototype: Object() // jshint ignore:line
+    },
 
-        if(this.provider !== undefined) {
-            this.provider.send(data);
-        } else {
-            console.warn("provider is not set");
-            this.queued.push(data);
+    shh: {
+        prototype: Object(), // jshint ignore:line
+        watch: function (params) {
+            return new Filter(params, shhWatch);
         }
-    };
+    },
 
-    ProviderManager.prototype.set = function(provider) {
-        if(this.provider !== undefined && this.provider.unload !== undefined) {
-            this.provider.unload();
+    on: function(event, id, cb) {
+        if(web3._events[event] === undefined) {
+            web3._events[event] = {};
         }
 
-        this.provider = provider;
-        this.ready = true;
-    };
+        web3._events[event][id] = cb;
+        return this;
+    },
 
-    ProviderManager.prototype.sendQueued = function() {
-        for(var i = 0; this.queued.length; i++) {
-            // Resend
-            this.send(this.queued[i]);
+    off: function(event, id) {
+        if(web3._events[event] !== undefined) {
+            delete web3._events[event][id];
         }
-    };
 
-    ProviderManager.prototype.installed = function() {
-        return this.provider !== undefined;
-    };
+        return this;
+    },
 
-    ProviderManager.prototype.startPolling = function (data, pollId) {
-        if (!this.provider || !this.provider.poll) {
+    trigger: function(event, id, data) {
+        var callbacks = web3._events[event];
+        if (!callbacks || !callbacks[id]) {
             return;
         }
-        this.polls.push({data: data, id: pollId});
-    };
-
-    ProviderManager.prototype.stopPolling = function (pollId) {
-        for (var i = this.polls.length; i--;) {
-            var poll = this.polls[i];
-            if (poll.id === pollId) {
-                this.polls.splice(i, 1);
-            }
+        var cb = callbacks[id];
+        cb(data);
+    }
+};
+
+var eth = web3.eth;
+setupMethods(eth, ethMethods());
+setupProperties(eth, ethProperties());
+setupMethods(web3.db, dbMethods());
+setupMethods(web3.shh, shhMethods());
+
+var ethWatch = {
+    changed: 'eth_changed'
+};
+setupMethods(ethWatch, ethWatchMethods());
+var shhWatch = {
+    changed: 'shh_changed'
+};
+setupMethods(shhWatch, shhWatchMethods());
+
+var ProviderManager = function() {
+    this.queued = [];
+    this.polls = [];
+    this.ready = false;
+    this.provider = undefined;
+    this.id = 1;
+
+    var self = this;
+    var poll = function () {
+        if (self.provider && self.provider.poll) {
+            self.polls.forEach(function (data) {
+                data.data._id = self.id;
+                self.id++;
+                self.provider.poll(data.data, data.id);
+            });
         }
+        setTimeout(poll, 12000);
     };
+    poll();
+};
 
-    web3.provider = new ProviderManager();
-
-    web3.setProvider = function(provider) {
-        provider.onmessage = messageHandler;
-        web3.provider.set(provider);
-        web3.provider.sendQueued();
-    };
+ProviderManager.prototype.send = function(data, cb) {
+    data._id = this.id;
+    if (cb) {
+        web3._callbacks[data._id] = cb;
+    }
 
-    var Filter = function(options, impl) {
-        this.impl = impl;
-        this.callbacks = [];
+    data.args = data.args || [];
+    this.id++;
 
-        var self = this;
-        this.promise = impl.newFilter(options);
-        this.promise.then(function (id) {
-            self.id = id;
-            web3.on(impl.changed, id, self.trigger.bind(self));
-            web3.provider.startPolling({call: impl.changed, args: [id]}, id);
-        });
-    };
+    if(this.provider !== undefined) {
+        this.provider.send(data);
+    } else {
+        console.warn("provider is not set");
+        this.queued.push(data);
+    }
+};
 
-    Filter.prototype.arrived = function(callback) {
-        this.changed(callback);
-    };
+ProviderManager.prototype.set = function(provider) {
+    if(this.provider !== undefined && this.provider.unload !== undefined) {
+        this.provider.unload();
+    }
 
-    Filter.prototype.changed = function(callback) {
-        var self = this;
-        this.promise.then(function(id) {
-            self.callbacks.push(callback);
-        });
-    };
+    this.provider = provider;
+    this.ready = true;
+};
 
-    Filter.prototype.trigger = function(messages) {
-        for(var i = 0; i < this.callbacks.length; i++) {
-            this.callbacks[i].call(this, messages);
-        }
-    };
-
-    Filter.prototype.uninstall = function() {
-        var self = this;
-        this.promise.then(function (id) {
-            self.impl.uninstallFilter(id);
-            web3.provider.stopPolling(id);
-            web3.off(impl.changed, id);
-        });
-    };
+ProviderManager.prototype.sendQueued = function() {
+    for(var i = 0; this.queued.length; i++) {
+        // Resend
+        this.send(this.queued[i]);
+    }
+};
 
-    Filter.prototype.messages = function() {
-        var self = this;
-        return this.promise.then(function (id) {
-            return self.impl.getMessages(id);
-        });
-    };
+ProviderManager.prototype.installed = function() {
+    return this.provider !== undefined;
+};
 
-    function messageHandler(data) {
-        if(data._event !== undefined) {
-            web3.trigger(data._event, data._id, data.data);
-            return;
+ProviderManager.prototype.startPolling = function (data, pollId) {
+    if (!this.provider || !this.provider.poll) {
+        return;
+    }
+    this.polls.push({data: data, id: pollId});
+};
+
+ProviderManager.prototype.stopPolling = function (pollId) {
+    for (var i = this.polls.length; i--;) {
+        var poll = this.polls[i];
+        if (poll.id === pollId) {
+            this.polls.splice(i, 1);
         }
+    }
+};
+
+web3.provider = new ProviderManager();
+
+web3.setProvider = function(provider) {
+    provider.onmessage = messageHandler;
+    web3.provider.set(provider);
+    web3.provider.sendQueued();
+};
+
+var Filter = function(options, impl) {
+    this.impl = impl;
+    this.callbacks = [];
+
+    var self = this;
+    this.promise = impl.newFilter(options);
+    this.promise.then(function (id) {
+        self.id = id;
+        web3.on(impl.changed, id, self.trigger.bind(self));
+        web3.provider.startPolling({call: impl.changed, args: [id]}, id);
+    });
+};
+
+Filter.prototype.arrived = function(callback) {
+    this.changed(callback);
+};
+
+Filter.prototype.changed = function(callback) {
+    var self = this;
+    this.promise.then(function(id) {
+        self.callbacks.push(callback);
+    });
+};
+
+Filter.prototype.trigger = function(messages) {
+    for(var i = 0; i < this.callbacks.length; i++) {
+        this.callbacks[i].call(this, messages);
+    }
+};
+
+Filter.prototype.uninstall = function() {
+    var self = this;
+    this.promise.then(function (id) {
+        self.impl.uninstallFilter(id);
+        web3.provider.stopPolling(id);
+        web3.off(impl.changed, id);
+    });
+};
+
+Filter.prototype.messages = function() {
+    var self = this;
+    return this.promise.then(function (id) {
+        return self.impl.getMessages(id);
+    });
+};
+
+function messageHandler(data) {
+    if(data._event !== undefined) {
+        web3.trigger(data._event, data._id, data.data);
+        return;
+    }
 
-        if(data._id) {
-            var cb = web3._callbacks[data._id];
-            if (cb) {
-                cb.call(this, data.error, data.data);
-                delete web3._callbacks[data._id];
-            }
+    if(data._id) {
+        var cb = web3._callbacks[data._id];
+        if (cb) {
+            cb.call(this, data.error, data.data);
+            delete web3._callbacks[data._id];
         }
     }
+}
 
-    module.exports = web3;
+module.exports = web3;
 
diff --git a/lib/qt.js b/lib/qt.js
index 7ec548c8c..f02239547 100644
--- a/lib/qt.js
+++ b/lib/qt.js
@@ -16,29 +16,30 @@
 */
 /** @file qt.js
  * @authors:
+ *   Jeffrey Wilcke <jeff@ethdev.com>
  *   Marek Kotewicz <marek@ethdev.com>
  * @date 2014
  */
 
-    var QtProvider = function() {
-        this.handlers = [];
+var QtProvider = function() {
+    this.handlers = [];
 
-        var self = this;
-        navigator.qt.onmessage = function (message) {
-            self.handlers.forEach(function (handler) {
-                handler.call(self, JSON.parse(message.data));
-            });
-        };
+    var self = this;
+    navigator.qt.onmessage = function (message) {
+        self.handlers.forEach(function (handler) {
+            handler.call(self, JSON.parse(message.data));
+        });
     };
+};
 
-    QtProvider.prototype.send = function(payload) {
-        navigator.qt.postMessage(JSON.stringify(payload));
-    };
+QtProvider.prototype.send = function(payload) {
+    navigator.qt.postMessage(JSON.stringify(payload));
+};
 
-    Object.defineProperty(QtProvider.prototype, "onmessage", {
-        set: function(handler) {
-            this.handlers.push(handler);
-        }
-    });
+Object.defineProperty(QtProvider.prototype, "onmessage", {
+    set: function(handler) {
+        this.handlers.push(handler);
+    }
+});
 
 module.exports = QtProvider;
diff --git a/lib/websocket.js b/lib/websocket.js
index 93d58aeba..0c7563062 100644
--- a/lib/websocket.js
+++ b/lib/websocket.js
@@ -16,59 +16,61 @@
 */
 /** @file websocket.js
  * @authors:
+ *   Jeffrey Wilcke <jeff@ethdev.com>
  *   Marek Kotewicz <marek@ethdev.com>
  *   Marian Oancea <marian@ethdev.com>
  * @date 2014
  */
 
-if(process.env.NODE_ENV !== "build") {
+if (process.env.NODE_ENV !== "build") {
     var WebSocket = require('ws'); // jshint ignore:line
 }
 
-    var WebSocketProvider = function(host) {
-        // onmessage handlers
-        this.handlers = [];
-        // queue will be filled with messages if send is invoked before the ws is ready
-        this.queued = [];
-        this.ready = false;
+var WebSocketProvider = function(host) {
+    // onmessage handlers
+    this.handlers = [];
+    // queue will be filled with messages if send is invoked before the ws is ready
+    this.queued = [];
+    this.ready = false;
 
-        this.ws = new WebSocket(host);
+    this.ws = new WebSocket(host);
 
-        var self = this;
-        this.ws.onmessage = function(event) {
-            for(var i = 0; i < self.handlers.length; i++) {
-                self.handlers[i].call(self, JSON.parse(event.data), event);
-            }
-        };
-
-        this.ws.onopen = function() {
-            self.ready = true;
-
-            for(var i = 0; i < self.queued.length; i++) {
-                // Resend
-                self.send(self.queued[i]);
-            }
-        };
+    var self = this;
+    this.ws.onmessage = function(event) {
+        for(var i = 0; i < self.handlers.length; i++) {
+            self.handlers[i].call(self, JSON.parse(event.data), event);
+        }
     };
-    WebSocketProvider.prototype.send = function(payload) {
-        if(this.ready) {
-            var data = JSON.stringify(payload);
 
-            this.ws.send(data);
-        } else {
-            this.queued.push(payload);
+    this.ws.onopen = function() {
+        self.ready = true;
+
+        for(var i = 0; i < self.queued.length; i++) {
+            // Resend
+            self.send(self.queued[i]);
         }
     };
+};
 
-    WebSocketProvider.prototype.onMessage = function(handler) {
-        this.handlers.push(handler);
-    };
+WebSocketProvider.prototype.send = function(payload) {
+    if(this.ready) {
+        var data = JSON.stringify(payload);
 
-    WebSocketProvider.prototype.unload = function() {
-        this.ws.close();
-    };
-    Object.defineProperty(WebSocketProvider.prototype, "onmessage", {
-        set: function(provider) { this.onMessage(provider); }
-    });
+        this.ws.send(data);
+    } else {
+        this.queued.push(payload);
+    }
+};
+
+WebSocketProvider.prototype.onMessage = function(handler) {
+    this.handlers.push(handler);
+};
+
+WebSocketProvider.prototype.unload = function() {
+    this.ws.close();
+};
+Object.defineProperty(WebSocketProvider.prototype, "onmessage", {
+    set: function(provider) { this.onMessage(provider); }
+});
 
 module.exports = WebSocketProvider;