Flow Music API (flowmusic)

from $0.01 per generation on the APIMart route — https://api.apimart.ai/v1 の OpenAI 互換エンドポイント1つだけ、月額プランは不要です。(2026-10-12 時点)

APIキー · 料金 · モデルページ · ⚡ 60秒クイックスタート

チームが APIMart 経由で Flow Music（flowmusic）を使う理由

• **キー1つでカタログ全体。**同じ https://api.apimart.ai/v1 の base URL と Authorization ヘッダーで Flow Music（flowmusic）と画像・動画・言語モデルなど 300+ のモデルにアクセスできます。切り替えるのは model フィールドだけで、クライアント側の変更は不要です。
• **最低 $1 から、従量課金。**サブスクリプションも、事前に規模を見積もるプリペイドプランもありません。$1 からチャージして、呼び出した分だけ使えます。
• **課金内容はレスポンスで返ります。**完了したタスクはすべて請求額（cost / credits_cost）を報告し、failed になったタスクは返金されます。
• **非同期前提の設計。**送信して task_id を受け取り、GET /v1/tasks/{id} をポーリングするだけ。バッチ処理もリトライも特別な統合ではなく、普通のキュー処理です。

Flow Music API on APIMart provides a production-ready AI music generation workflow for creating full songs from lyrics and style prompts, with vocals or instrumental output and asynchronous task polling.

Model id and routes

Route	model value	Billing	Notes
Music generation (async task)	flowmusic	per generated track, by operation	see the model page for the exact tiers

Endpoint: POST https://api.apimart.ai/v1/music/generations, then poll GET /v1/tasks/{task_id}.

Pricing

Resolution	List price	Effective price
default	0.075	0.06

Prices are a snapshot; the pricing page and data/model.json are refreshed by CI, and a completed task reports the exact amount in its cost field.

Request parameters

Field	Type	Default	Notes
model	string	—	the music model id
title	string	—	track title
sound_prompt	string	—	style / instrumentation description (one of sound_prompt or lyrics is required)
lyrics	string	—	lyrics text with section tags; leave empty for instrumental
bpm	string	number	—
length	integer	—	target duration in seconds
audio_url	string	—	source audio for extend / cover / stem operations
callback_url	string	—	webhook called when the task completes

The table lists the fields accepted by the APIMart music/generations endpoint. Check the model page for anything this model adds on top.

Quickstart

curl --request POST --url https://api.apimart.ai/v1/music/generations \
  --header "Authorization: Bearer $APIMART_API_KEY" --header 'Content-Type: application/json' \
  -d '{"model":"flowmusic","title":"My Song","sound_prompt":"upbeat pop music with piano","bpm":"120","length":60}'

import os, time, requests

BASE = "https://api.apimart.ai/v1"
HEADERS = {"Authorization": f"Bearer {os.environ['APIMART_API_KEY']}", "Content-Type": "application/json"}

created = requests.post(f"{BASE}/music/generations", headers=HEADERS, timeout=60, json={
    "model": "flowmusic", "title": "My Song", "sound_prompt": "upbeat pop music with piano", "bpm": "120", "length": 60,
}).json()
task_id = created["data"]["id"]

while True:
    task = requests.get(f"{BASE}/tasks/{task_id}", headers=HEADERS, timeout=60).json()["data"]
    if task["status"] in ("completed", "failed"):
        break
    time.sleep(5)
print(task.get("cost"), task["result"]["audio"][0]["url"])

Runnable versions: examples/. The task lifecycle is pending → processing → completed | failed.

FAQ

Flow Music のモデル id は何ですか？

flowmusic です。上のルート表を参照してください。

課金方法は？

from $0.01 per generation on the APIMart route。完了したタスクは cost フィールドに正確な金額を報告し、失敗したタスクは返金されます。

How do I get a key?

Use the Get an API key link — $1 minimum top-up, no plan required.

Related repositories

• Same model, this language — the other half of this pair: flowmusic-prompts-ja
• Same model, other languages — 10 more language builds: English flowmusic-api · 中文 flowmusic-api-cn · Deutsch flowmusic-api-de · Español flowmusic-api-es · Français flowmusic-api-fr · Relay/gateway flowmusic-api-gateway · Bahasa flowmusic-api-id · 한국어 flowmusic-api-ko · Português flowmusic-api-pt · Русский flowmusic-api-ru
• More models in this language — midjourney-api-ja · gemini-2-5-flash-image-preview-api-ja · nano-banana-api-ja · gemini-3-1-flash-image-preview-api-ja · nano-banana-2-api-ja · gemini-3-pro-image-preview-api-ja
• Topic hubs — every build of this model, all languages: flowmusic · flowmusic-api

This repository is one build in a cross-linked set of API guides for the same model family; each language build links back to the others.

Attributed links (how this repository is measured)

Purpose	Attributed link	Target
Model page	https://go.apimart.ai/k-840eca	apimart.ai/ja/model/flow-music
Live pricing	https://go.apimart.ai/k-f5974d	apimart.ai/ja/pricing
Get an API key	https://go.apimart.ai/k-0f4205	apimart.ai/ja/keys

Outbound APIMart links are minted through the promo link API; hand-made tracking parameters are rejected by tools/check_links.py in CI.

Disclosure

Flow Music is a third-party model served through APIMart; this repository documents how to call it and publishes model ids and prices, and does not claim official status. Model names, prices and documentation belong to their respective owners.

License

MIT — see LICENSE.