Acestep AI Ace Step 1.5 API | Pricing & Docs

acestep-ai/ace-step-1.5/text-to-audio

Generate songs up to 4 minutes from style tags and optional lyrics with original vocals and high acoustic fidelity, on RunComfy models and HTTP API.

1. Get started

Use RunComfy's API to run acestep-ai/ace-step-1.5/text-to-audio. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/acestep-ai/ace-step-1.5/text-to-audio \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "tags": "steampunk, electro swing, jazz, piano, ticking clock"
  }'

2. Authentication

Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.

3. API reference

Submit a request

Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/acestep-ai/ace-step-1.5/text-to-audio \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "tags": "steampunk, electro swing, jazz, piano, ticking clock"
  }'

Monitor request status

Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
  --header "Authorization: Bearer <token>"

Retrieve request results

Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
  --header "Authorization: Bearer <token>"

Cancel a request

Cancel a queued job by request_id; in-progress jobs cannot be cancelled.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
  --header "Authorization: Bearer <token>"

4. File inputs

Hosted file (URL)

Provide a publicly reachable HTTPS URL. Ensure the host allows server-side fetches (no login/cookies required) and isn't rate-limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre-signed URLs for private assets.

5. Schema

Input schema

{
  "type": "object",
  "title": "Input schema",
  "required": [
    "tags"
  ],
  "properties": {
    "tags": {
      "title": "Tags",
      "description": "Comma-separated list of genre, mood, and instrument tags to steer the style of the generated track.",
      "type": "string",
      "default": "steampunk, electro swing, jazz, piano, ticking clock"
    },
    "lyrics": {
      "title": "Lyrics",
      "description": "Optional vocal content for the track. Leave blank or use [inst] / [instrumental] for an instrumental; use [Verse], [Chorus], [Bridge] markers to structure the song.",
      "type": "string",
      "default": "[Verse]\nTicking tocking goes the clock\nTurning keys and pick the lock\nSteam is rising, gears go round\nListen to that brassy sound\n[Chorus]\nRound and round we go today\nIn this smoky cabaret\nFix the future, fix the past"
    },
    "duration": {
      "title": "Duration (seconds)",
      "description": "Audio length in seconds.",
      "type": "integer",
      "minimum": 5,
      "maximum": 240,
      "default": 60
    },
    "seed": {
      "title": "Seed",
      "description": "",
      "type": "integer",
      "minimum": -1,
      "maximum": 2147483647,
      "default": -1
    }
  }
}

Output schema

{
  "output": {
    "type": "object",
    "properties": {
      "image": {
        "type": "string",
        "format": "uri",
        "description": "single image URL"
      },
      "video": {
        "type": "string",
        "format": "uri",
        "description": "single video URL"
      },
      "images": {
        "type": "array",
        "description": "multiple image URLs",
        "items": {
          "type": "string",
          "format": "uri"
        }
      },
      "videos": {
        "type": "array",
        "description": "multiple video URLs",
        "items": {
          "type": "string",
          "format": "uri"
        }
      }
    }
  }
}

RunComfy

RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Models, enabling artists to harness the latest AI tools to create incredible art.

1. Get started

Use RunComfy's API to run acestep-ai/ace-step-1.5/text-to-audio. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/acestep-ai/ace-step-1.5/text-to-audio \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "tags": "steampunk, electro swing, jazz, piano, ticking clock"
  }'

3. API reference

Submit a request

Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/acestep-ai/ace-step-1.5/text-to-audio \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "tags": "steampunk, electro swing, jazz, piano, ticking clock"
  }'

Monitor request status

Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
  --header "Authorization: Bearer <token>"

Retrieve request results

Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
  --header "Authorization: Bearer <token>"

Cancel a request

Cancel a queued job by request_id; in-progress jobs cannot be cancelled.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
  --header "Authorization: Bearer <token>"

4. File inputs

Hosted file (URL)

5. Schema

Input schema

{
  "type": "object",
  "title": "Input schema",
  "required": [
    "tags"
  ],
  "properties": {
    "tags": {
      "title": "Tags",
      "description": "Comma-separated list of genre, mood, and instrument tags to steer the style of the generated track.",
      "type": "string",
      "default": "steampunk, electro swing, jazz, piano, ticking clock"
    },
    "lyrics": {
      "title": "Lyrics",
      "description": "Optional vocal content for the track. Leave blank or use [inst] / [instrumental] for an instrumental; use [Verse], [Chorus], [Bridge] markers to structure the song.",
      "type": "string",
      "default": "[Verse]\nTicking tocking goes the clock\nTurning keys and pick the lock\nSteam is rising, gears go round\nListen to that brassy sound\n[Chorus]\nRound and round we go today\nIn this smoky cabaret\nFix the future, fix the past"
    },
    "duration": {
      "title": "Duration (seconds)",
      "description": "Audio length in seconds.",
      "type": "integer",
      "minimum": 5,
      "maximum": 240,
      "default": 60
    },
    "seed": {
      "title": "Seed",
      "description": "",
      "type": "integer",
      "minimum": -1,
      "maximum": 2147483647,
      "default": -1
    }
  }
}

Output schema

{
  "output": {
    "type": "object",
    "properties": {
      "image": {
        "type": "string",
        "format": "uri",
        "description": "single image URL"
      },
      "video": {
        "type": "string",
        "format": "uri",
        "description": "single video URL"
      },
      "images": {
        "type": "array",
        "description": "multiple image URLs",
        "items": {
          "type": "string",
          "format": "uri"
        }
      },
      "videos": {
        "type": "array",
        "description": "multiple video URLs",
        "items": {
          "type": "string",
          "format": "uri"
        }
      }
    }
  }
}

Generate songs up to 4 minutes from style tags and optional lyrics with original vocals and high acoustic fidelity, on RunComfy models and HTTP API.

Table of contents

1. Get started

2. Authentication

3. API reference

Submit a request

Monitor request status

Retrieve request results

Cancel a request

4. File inputs

Hosted file (URL)

5. Schema

Input schema

Output schema

Generate songs up to 4 minutes from style tags and optional lyrics with original vocals and high acoustic fidelity, on RunComfy models and HTTP API.

Table of contents

1. Get started

2. Authentication

3. API reference

Submit a request

Monitor request status

Retrieve request results

Cancel a request

4. File inputs

Hosted file (URL)

5. Schema

Input schema

Output schema

Ace Step 1.5: Text-to-Music with Vocals, Lyrics & Style Tag Control on Models and API | RunComfy

Generate songs up to 4 minutes from style tags and optional lyrics with original vocals and high acoustic fidelity, on RunComfy models and HTTP API.

Table of contents

1. Get started

2. Authentication

3. API reference

Submit a request

Monitor request status

Retrieve request results

Cancel a request

4. File inputs

Hosted file (URL)

5. Schema

Input schema

Output schema

Ace Step 1.5: Text-to-Music with Vocals, Lyrics & Style Tag Control on Models and API | RunComfy

Generate songs up to 4 minutes from style tags and optional lyrics with original vocals and high acoustic fidelity, on RunComfy models and HTTP API.

Table of contents

1. Get started

2. Authentication

3. API reference

Submit a request

Monitor request status

Retrieve request results

Cancel a request

4. File inputs

Hosted file (URL)

5. Schema

Input schema

Output schema