diff --git a/README.md b/README.md
index 5249ef8..44a41fa 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Export your battles from SplatNet to stat.ink
 1. Install deno
 
 2. Run
-   `deno run --allow-net --allow-read --allow-write --allow-env https://raw.githubusercontent.com/spacemeowx2/s3si.ts/master/s3si.ts`
+   `deno run --allow-net --allow-read --allow-write --allow-env https://raw.githubusercontent.com/spacemeowx2/s3si.ts/main/s3si.ts`
 
 ## Credits
 
diff --git a/exporter/file.ts b/exporter/file.ts
index 2382780..1bbaf88 100644
--- a/exporter/file.ts
+++ b/exporter/file.ts
@@ -38,17 +38,20 @@ export class FileExporter implements BattleExporter<VsHistoryDetail> {
 
     await Deno.writeTextFile(filepath, JSON.stringify(body));
   }
-  async getLatestBattleTime() {
-    await Deno.mkdir(this.exportPath, { recursive: true });
+  async notExported(list: string[]): Promise<string[]> {
+    const out: string[] = [];
 
-    const dirs: Deno.DirEntry[] = [];
-    for await (const i of Deno.readDir(this.exportPath)) dirs.push(i);
+    for (const id of list) {
+      const filename = `${id}.json`;
+      const filepath = path.join(this.exportPath, filename);
+      const isFile = await Deno.stat(filepath).then((f) => f.isFile).catch(() =>
+        false
+      );
+      if (isFile) {
+        out.push(id);
+      }
+    }
 
-    const files = dirs.filter((i) => i.isFile).map((i) => i.name);
-    const timestamps = files.map((i) => i.replace(/\.json$/, "")).map((i) =>
-      datetime.parse(i, FILENAME_FORMAT)
-    );
-
-    return timestamps.reduce((a, b) => (a > b ? a : b), new Date(0));
+    return out;
   }
 }
diff --git a/exporter/stat.ink.ts b/exporter/stat.ink.ts
index 6392f16..e5a75a3 100644
--- a/exporter/stat.ink.ts
+++ b/exporter/stat.ink.ts
@@ -1,8 +1,25 @@
-// deno-lint-ignore-file no-unused-vars require-await
-import { USERAGENT } from "../constant.ts";
+import { S3SI_NAMESPACE, USERAGENT } from "../constant.ts";
 import { BattleExporter, VsHistoryDetail } from "../types.ts";
+import { base64, msgpack, uuid } from "../deps.ts";
+import { APIError } from "../APIError.ts";
 
-const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
+const S3S_NAMESPACE = "b3a2dbf5-2c09-4792-b78c-00b548b70aeb";
+
+/**
+ * generate s3s uuid
+ *
+ * @param id ID from SplatNet3
+ * @returns id generated from s3s
+ */
+function s3sUuid(id: string): Promise<string> {
+  const fullId = base64.decode(id);
+  const tsUuid = fullId.slice(fullId.length - 52, fullId.length);
+  return uuid.v5.generate(S3S_NAMESPACE, tsUuid);
+}
+
+function battleId(id: string): Promise<string> {
+  return uuid.v5.generate(S3SI_NAMESPACE, new TextEncoder().encode(id));
+}
 
 /**
  * Exporter to stat.ink.
@@ -23,13 +40,56 @@ export class StatInkExporter implements BattleExporter<VsHistoryDetail> {
     };
   }
   async exportBattle(detail: VsHistoryDetail) {
-    await sleep(1000);
+    const body = {
+      test: "yes",
+    };
+
+    const resp = await fetch("https://stat.ink/api/v3/battle", {
+      method: "POST",
+      headers: {
+        ...this.requestHeaders(),
+        "Content-Type": "application/x-msgpack",
+      },
+      body: msgpack.encode(body),
+    });
+
+    if (resp.status !== 200 && resp.status !== 201) {
+      throw new APIError({
+        response: resp,
+        message: "Failed to export battle",
+      });
+    }
+
+    const json: {
+      error?: unknown;
+    } = await resp.json();
+
+    if (json.error) {
+      throw new APIError({
+        response: resp,
+        message: "Failed to export battle",
+        json,
+      });
+    }
+
+    throw new Error("abort");
   }
-  async getLatestBattleTime(): Promise<Date> {
-    const uuids = await (await fetch("https://stat.ink/api/v3/s3s/uuid-list", {
+  async notExported(list: string[]): Promise<string[]> {
+    const uuid = await (await fetch("https://stat.ink/api/v3/s3s/uuid-list", {
       headers: this.requestHeaders(),
     })).json();
-    console.log("\n\n uuid:", uuids);
-    throw new Error("Not implemented");
+
+    const out: string[] = [];
+
+    for (const id of list) {
+      const s3sId = await s3sUuid(id);
+      const s3siId = await battleId(id);
+
+      if (!uuid.includes(s3sId) && !uuid.includes(s3siId)) {
+        out.push(id);
+      }
+    }
+
+    return out;
   }
 }
diff --git a/s3si.ts b/s3si.ts
index c66d515..3400968 100644
--- a/s3si.ts
+++ b/s3si.ts
@@ -1,12 +1,11 @@
 import { getBulletToken, getGToken, loginManually } from "./iksm.ts";
-import { APIError } from "./APIError.ts";
 import { flags, MultiProgressBar, Mutex } from "./deps.ts";
 import { DEFAULT_STATE, State } from "./state.ts";
 import { checkToken, getBattleDetail, getBattleList } from "./splatnet3.ts";
 import { BattleExporter, VsHistoryDetail } from "./types.ts";
 import { Cache, FileCache, MemoryCache } from "./cache.ts";
 import { StatInkExporter } from "./exporter/stat.ink.ts";
-import { readline } from "./utils.ts";
+import { readline, showError } from "./utils.ts";
 import { FileExporter } from "./exporter/file.ts";
 
 type Opts = {
@@ -149,79 +148,72 @@ Options:
       : undefined;
     const exporters = await this.getExporters();
 
-    try {
-      if (!this.state.loginState?.sessionToken) {
-        const sessionToken = await loginManually();
+    if (!this.state.loginState?.sessionToken) {
+      const sessionToken = await loginManually();
 
-        await this.writeState({
-          ...this.state,
-          loginState: {
-            ...this.state.loginState,
-            sessionToken,
-          },
-        });
-      }
-      const sessionToken = this.state.loginState!.sessionToken!;
-
-      console.log("Checking token...");
-      if (!await checkToken(this.state)) {
-        console.log("Token expired, refetch tokens.");
-
-        const { webServiceToken, userCountry, userLang } = await getGToken({
-          fApi: this.state.fGen,
+      await this.writeState({
+        ...this.state,
+        loginState: {
+          ...this.state.loginState,
           sessionToken,
-        });
-
-        const bulletToken = await getBulletToken({
-          webServiceToken,
-          userLang,
-          userCountry,
-          appUserAgent: this.state.appUserAgent,
-        });
-
-        await this.writeState({
-          ...this.state,
-          loginState: {
-            ...this.state.loginState,
-            gToken: webServiceToken,
-            bulletToken,
-          },
-          userLang: this.state.userLang ?? userLang,
-          userCountry: this.state.userCountry ?? userCountry,
-        });
-      }
-
-      const fetcher = new BattleFetcher({
-        cache: new FileCache(this.state.cacheDir),
-        state: this.state,
+        },
       });
-      console.log("Fetching battle list...");
-      const battleList = await getBattleList(this.state);
+    }
+    const sessionToken = this.state.loginState!.sessionToken!;
 
-      await this.prepareBattles({
-        bar,
-        battleList,
-        fetcher,
-        exporters,
+    console.log("Checking token...");
+    if (!await checkToken(this.state)) {
+      console.log("Token expired, refetch tokens.");
+
+      const { webServiceToken, userCountry, userLang } = await getGToken({
+        fApi: this.state.fGen,
+        sessionToken,
       });
 
-      const allProgress: Record<string, Progress> = {};
-      const redraw = (name: string, progress: Progress) => {
-        allProgress[name] = progress;
-        bar?.render(
-          Object.entries(allProgress).map(([name, progress]) => ({
-            completed: progress.current,
-            total: progress.total,
-            text: name,
-          })),
-        );
-      };
-      const stats: Record<string, number> = Object.fromEntries(
-        exporters.map((e) => [e.name, 0]),
+      const bulletToken = await getBulletToken({
+        webServiceToken,
+        userLang,
+        userCountry,
+        appUserAgent: this.state.appUserAgent,
+      });
+
+      await this.writeState({
+        ...this.state,
+        loginState: {
+          ...this.state.loginState,
+          gToken: webServiceToken,
+          bulletToken,
+        },
+        userLang: this.state.userLang ?? userLang,
+        userCountry: this.state.userCountry ?? userCountry,
+      });
+    }
+
+    const fetcher = new BattleFetcher({
+      cache: new FileCache(this.state.cacheDir),
+      state: this.state,
+    });
+    console.log("Fetching battle list...");
+    const battleList = await getBattleList(this.state);
+
+    const allProgress: Record<string, Progress> = {};
+    const redraw = (name: string, progress: Progress) => {
+      allProgress[name] = progress;
+      bar?.render(
+        Object.entries(allProgress).map(([name, progress]) => ({
+          completed: progress.current,
+          total: progress.total,
+          text: name,
+        })),
       );
+    };
+    const stats: Record<string, number> = Object.fromEntries(
+      exporters.map((e) => [e.name, 0]),
+    );
 
-      await Promise.all(
-        exporters.map((e) =>
+    await Promise.all(
+      exporters.map((e) =>
+        showError(
           this.exportBattleList({
             fetcher,
             exporter: e,
@@ -230,64 +222,15 @@ Options:
           })
             .then((count) => {
               stats[e.name] = count;
-            })
-            .catch((err) => {
-              console.error(`\nFailed to export ${e.name}:`, err);
-            })
-        ),
-      );
-
-      console.log("\nDone.", stats);
-    } catch (e) {
-      if (e instanceof APIError) {
-        console.error(`APIError: ${e.message}`, e.response, e.json);
-      } else {
-        console.error(e);
-      }
-    }
-  }
-  async prepareBattles({
-    bar,
-    exporters,
-    battleList,
-    fetcher,
-  }: {
-    bar?: MultiProgressBar;
-    exporters: BattleExporter<VsHistoryDetail>[];
-    battleList: string[];
-    fetcher: BattleFetcher;
-  }) {
-    let prepared = 0;
-    bar?.render([{
-      text: "preparing",
-      completed: prepared,
-      total: battleList.length,
-    }]);
-
-    const latestBattleTimes = await Promise.all(
-      exporters.map((e) => e.getLatestBattleTime()),
-    );
-    const latestBattleTime = latestBattleTimes.reduce(
-      (a, b) => a > b ? b : a,
-      new Date(0),
+            }),
+        )
+          .catch((err) => {
+            console.error(`\nFailed to export to ${e.name}:`, err);
+          })
+      ),
     );
 
-    for (const battleId of battleList) {
-      const battle = await fetcher.fetchBattle(battleId);
-      const playedTime = new Date(battle.playedTime);
-
-      prepared += 1;
-      bar?.render([{
-        text: "preparing",
-        completed: prepared,
-        total: battleList.length,
-      }]);
-
-      // if battle is older than latest battle, break
-      if (playedTime <= latestBattleTime) {
-        break;
-      }
-    }
+    console.log("\nDone.", stats);
   }
   /**
    * Export battle list.
@@ -310,27 +253,14 @@ Options:
       onStep?: (progress: Progress) => void;
     },
   ): Promise<number> {
-    const latestBattleTime = await exporter.getLatestBattleTime();
-    let toUpload = 0;
     let exported = 0;
 
-    for (const battleId of battleList) {
-      const battle = await fetcher.fetchBattle(battleId);
-      const playedTime = new Date(battle.playedTime);
+    onStep?.({
+      current: 0,
+      total: 1,
+    });
 
-      // if battle is older than latest battle, break
-      if (playedTime <= latestBattleTime) {
-        break;
-      }
-
-      toUpload += 1;
-    }
-
-    const workQueue = battleList.slice(0, toUpload).reverse();
-
-    if (workQueue.length === 0) {
-      return 0;
-    }
+    const workQueue = [...await exporter.notExported(battleList)].reverse();
 
     const step = async (battle: string) => {
       const detail = await fetcher.fetchBattle(battle);
@@ -375,4 +305,4 @@ const app = new App({
   ...DEFAULT_OPTS,
   ...parseArgs(Deno.args),
 });
-await app.run();
+await showError(app.run());
diff --git a/types.ts b/types.ts
index f262a7c..8692ccb 100644
--- a/types.ts
+++ b/types.ts
@@ -58,7 +58,7 @@ export type VsHistoryDetail = {
 
 export type BattleExporter<D> = {
   name: string;
-  getLatestBattleTime: () => Promise<Date>;
+  notExported: (list: string[]) => Promise<string[]>;
   exportBattle: (detail: D) => Promise<void>;
 };
 
@@ -121,3 +121,84 @@ export enum BattleListType {
   Bankara,
   Private,
 }
+
+export type StatInkPlayer = {
+  me: "yes" | "no";
+  rank_in_team: number;
+  name: string;
+  number: string;
+  splashtag_title: string;
+  weapon: string;
+  inked: number;
+  kill: number;
+  assist: number;
+  kill_or_assist: number;
+  death: number;
+  special: number;
+  disconnected: "yes" | "no";
+};
+
+export type StatInkPostBody = {
+  test: "yes" | "no";
+  uuid: string;
+  lobby:
+    | "regular"
+    | "bankara_challenge"
+    | "bankara_open"
+    | "splatfest_challenge"
+    | "splatfest_open"
+    | "private";
+  rule: "nawabari" | "area" | "hoko" | "yagura" | "asari";
+  stage: string;
+  weapon: string;
+  result: "win" | "lose" | "draw" | "exempted_lose";
+  knockout: "yes" | "no" | null; // for TW, set null or not sending
+  rank_in_team: 1 | 2 | 3 | 4; // position in scoreboard
+  kill: number;
+  assist: number;
+  kill_or_assist: number; // equals to kill + assist if you know them
+  death: number;
+  special: number; // use count
+  inked: number; // not including bonus
+  medals: string[]; // 0-3 elements
+  our_team_inked: number; // TW, not including bonus
+  their_team_inked: number; // TW, not including bonus
+  our_team_percent: number; // TW
+  their_team_percent: number; // TW
+  our_team_count: number; // Anarchy
+  their_team_count: number; // Anarchy
+  level_before: number;
+  level_after: number;
+  rank_before: string; // one of c- ... s+, lowercase only /^[abcs][+-]?$/ except s-
+  rank_before_s_plus: number;
+  rank_before_exp: number;
+  rank_after: string;
+  rank_after_s_plus: number;
+  rank_after_exp: number;
+  rank_exp_change: number; // Set rank_after_exp - rank_before_exp. It can be negative. Set only this value if you don't know their exact values.
+  rank_up_battle: "yes" | "no"; // Set "yes" if now "Rank-up Battle" mode.
+  challenge_win: number; // Win count for Anarchy (Series) If rank_up_battle is truthy("yes"), the value range is limited to [0, 3].
+  challenge_lose: number;
+  fest_power: number; // Splatfest Power (Pro)
+  fest_dragon?:
+    | "10x"
+    | "decuple"
+    | "100x"
+    | "dragon"
+    | "333x"
+    | "double_dragon";
+  clout_before: number; // Splatfest Clout, before the battle
+  clout_after: number; // Splatfest Clout, after the battle
+  clout_change: number; // Splatfest Clout, equals to clout_after - clout_before if you know them
+  cash_before?: number;
+  cash_after?: number;
+  our_team_players: StatInkPlayer[];
+  their_team_players: StatInkPlayer[];
+
+  agent: string;
+  agent_version: string;
+  agent_variables: Record<string, string>;
+  automated: "yes";
+  start_at: number; // the battle starts at e.g. 1599577200
+  end_at: number;
+};
diff --git a/utils.ts b/utils.ts
index a435078..debc1e7 100644
--- a/utils.ts
+++ b/utils.ts
@@ -1,3 +1,4 @@
+import { APIError } from "./APIError.ts";
 import { base64, io } from "./deps.ts";
 
 const stdinLines = io.readLines(Deno.stdin);
@@ -60,3 +61,22 @@ export function cache<F extends () => Promise<unknown>>(
     return value as PromiseReturnType<F>;
   };
 }
+
+export async function showError(p: Promise<void>) {
+  try {
+    await p;
+  } catch (e) {
+    if (e instanceof APIError) {
+      console.error(
+        `\n\nAPIError: ${e.message}`,
+        "\nResponse: ",
+        e.response,
+        "\nBody: ",
+        e.json,
+      );
+    } else {
+      console.error(e);
+    }
+    throw e;
+  }
+}