diff --git a/src/Beeminder.ts b/src/Beeminder.ts
new file mode 100644
index 0000000..96f95a3
--- /dev/null
+++ b/src/Beeminder.ts
@@ -0,0 +1,209 @@
+export namespace API {
+  export type CreateDatapoint = {
+    value: number;
+    timestamp?: number;
+    daystamp?: string;
+    comment?: string;
+    requestid?: string;
+  }
+  export type Datapoint = Required<CreateDatapoint> & {
+    id: string
+    updated_at: number
+  }
+  export interface GetDatapoints {
+    sort?: string;
+    count?: number;
+    page?: number;
+    per?: number;
+  }
+  export type GoalType = 'hustler' | 'biker' | 'fatloser' | 'gainer' | 'inboxer' | 'drinker' | 'custom';
+  export interface Goal {
+    slug: string;
+    updated_at: number;
+    title: string;
+    fineprint: string;
+    yaxis: string;
+    goaldate: number;
+    goalval: number;
+    rate: number;
+    runits: string;
+    svg_url: string;
+    graph_url: string;
+    thumb_url: string;
+    autodata: string | null;
+    goal_type: GoalType
+    losedate: number | null;
+    queued: boolean;
+    secret: boolean;
+    datapublic: boolean;
+    datapoints: Datapoint[];
+    numpts: number;
+    pledge: number;
+    initday: number;
+    initval: number;
+    curday: number;
+    curval: number;
+    lastday: number;
+    yaw: -1 | 1;
+    dir: -1 | 1;
+    lane: number;
+    mathishard: [number, number, number];
+    headsum: string;
+    limsum: string;
+    kyoom: boolean;
+    odom: boolean;
+    aggday: 'min' | 'max' | 'mean';
+    steppy: boolean;
+    rosy: boolean;
+    movingav: boolean;
+    aura: boolean;
+    frozen: boolean;
+    won: boolean;
+    lost: boolean;
+    maxflux: number;
+    contract: {
+      amount: number;
+      stepdown_at: number | null;
+    };
+    road: Array<[number | null, number | null, number | null]>;
+    roadall: Array<[number, number, number | null]>;
+    fullroad: Array<[number, number, number]>;
+    rah: number;
+    delta: number;
+    delta_text: string;
+    safebuf: number;
+    safebump: number;
+    id: string;
+    callback_url: string;
+    description: string;
+    graphsum: string;
+    lanewidth: number;
+    deadline: number;
+    leadtime: number;
+    alertstart: number;
+    plotall: boolean;
+    last_datapoint: Datapoint;
+    integery: boolean;
+    gunits: string;
+    hhmmformat: boolean;
+    todayta: boolean;
+    weekends_off: boolean;
+    tmin: string;
+    tmax: string;
+    tags: string[];
+  }
+  export interface NewGoal {
+    slug: string;
+    title: string;
+    goal_type: GoalType
+    gunits: string;
+    goaldate?: number | null;
+    goalval?: number | null;
+    rate?: number | null;
+    initval?: number;
+    secret?: boolean;
+    datapublic?: boolean;
+    datasource?: "api" | "ifttt" | "zapier" | string;
+    dryrun?: boolean;
+    tags?: string[];
+  };
+  export interface UpdateGoal {
+    title?: string;
+    yaxis?: string;
+    tmin?: string; // date format "yyyy-mm-dd"
+    tmax?: string; // date format "yyyy-mm-dd"
+    secret?: boolean;
+    datapublic?: boolean;
+    roadall?: Array<[number | null, number, number | null]>; // array of arrays like [date::int, value::float, rate::float] each with exactly one field null
+    datasource?: string; // one of {"api", "ifttt", "zapier", or clientname}. Default: none.
+    tags?: Array<string>; // a list of tags for the goal
+  }
+}
+export class Beeminder {
+  token: string
+  constructor(token: string) {
+    this.token = token
+  }
+  async post_request(url: string, post_data: any, method: "POST" | "PUT" = "POST") {
+    const response = await fetch("https://www.beeminder.com/api/v1/" + url + ".json", {
+      method,
+      body: JSON.stringify(Object.assign({}, post_data, { auth_token: this.token })),
+      headers: { 'Content-Type': 'application/json' }
+    })
+    if (response.ok || response.status == 422) {
+      return response.json()
+    } else {
+      throw [response.status, await response.text()]
+    }
+  }
+  async get_request(url: string, params = {}) {
+    const qs = new URLSearchParams(Object.assign({}, params, { auth_token: this.token }))
+    const response = await fetch("https://www.beeminder.com/api/v1/" + url + ".json?" + qs.toString())
+    if (response.ok || response.status == 422) {
+      return response.json()
+    } else {
+      throw [response.status, await response.text()]
+    }
+  }
+  user(user = "me") {
+    return new User(this, user)
+  }
+  charge(amount: number, note: string, dryrun = true) {
+    return this.post_request(`charges`, { amount, note, dryrun })
+  }
+}
+
+export class User {
+  b: Beeminder
+  user: string
+  constructor(b: Beeminder, user: string) {
+    this.b = b
+    this.user = user
+  }
+  info() {
+    return this.b.get_request(`users/${this.user}`)
+  }
+  goals() {
+    return this.b.get_request(`users/${this.user}/goals`)
+  }
+  goal(goal: string) {
+    return new Goal(this.b, this.user, goal)
+  }
+  create_goal(params: API.NewGoal) {
+    return this.b.post_request(`users/${this.user}/goals`, params, 'POST')
+  }
+}
+export class Goal {
+  b: Beeminder
+  user: string
+  goal: string
+  prefix: string
+  constructor(b: Beeminder, user: string, goal: string) {
+    Object.assign(this, { b, user, goal })
+    this.b = b
+    this.user = user
+    this.goal = goal
+    this.prefix = `users/${this.user}/goals/${this.goal}`
+  }
+  info(): Promise<Goal> {
+    return this.b.get_request(`${this.prefix}`)
+  }
+  update(params: API.UpdateGoal): Promise<Goal> {
+    return this.b.post_request(`${this.prefix}`, params, 'PUT')
+  }
+  refresh_graph(): Promise<boolean> {
+    return this.b.get_request(`${this.prefix}/refresh_graph`)
+  }
+  create_datapoint(params: API.CreateDatapoint): Promise<API.Datapoint> {
+    return this.b.post_request(`${this.prefix}/datapoints`, params)
+  }
+  create_datapoints(params: API.CreateDatapoint[]): Promise<API.Datapoint[]> {
+    return this.b.post_request(`${this.prefix}/datapoints/create_all`, params)
+  }
+  datapoints(params: API.GetDatapoints = {}): Promise<API.Datapoint[]> {
+    return this.b.get_request(`${this.prefix}/datapoints`, params)
+  }
+  // todo: put, delete datapoint
+}
+
+module.exports = Beeminder