chain101
text-to-image → image-to-video
Run a text-to-image model, then pass its generated image URL into an image-to-video model.
text-to-image ➜ image-to-video
Model chain API engine
BabyChain
Model chain API engine for image and video workloads with one durable pipeline and one final callback. Every output becomes the next input.
text-to-image, image-to-image, image-to-video, final callback, durable run state, inference failover, text-to-image, image-to-image
Built-in chain APIs
Three routes. One execution language.
chain202
image-to-image → image-to-video
Run an image-to-image model, then pass its generated image URL into an image-to-video model.
image-to-image ➜ image-to-video
chain303
text-to-image → image-to-image → image-to-video
Run a text-to-image model, pass its generated image URL into an image-to-image model, then pass its refined image URL into an image-to-video model.
text-to-image ➜ image-to-image ➜ image-to-video
API Lab
Chain routes with swappable models.
Deploy your own BabyChain, choose the route shape that fits your workflow, and start chaining your image and video models through one durable API with result fetches and signed final callbacks built in.
babychain://runbookline 1/3running
$
01 Request
Create chain run
curl --request POST \ --url https://your-babychain.example.com/api/v1/chains/chain1/runs \ --header "Authorization: Bearer BABYCHAIN_API_KEY" \ --header "Content-Type: application/json" \ --header "Idempotency-Key: sky-blue" \ --data '{ "input": { "chain_models": { "text_to_image_model": "bfl/flux-2-flex", "image_to_video_model": "bytedance/seedance-1.5-pro" }, "text_to_image_params": { "prompt": "A futuristic wireless headphone product on a clean reflective pedestal, teal and violet studio lighting, premium product photography, soft shadows, high detail", "width": 1024, "height": 1024, "prompt_upsampling": false, "seed": 593, "safety_tolerance": 5, "output_format": "jpeg" }, "image_to_video_params": { "content": [ { "type": "text", "text": "Slow cinematic orbit around the product, subtle glow animation, premium studio reflections, smooth camera motion" } ], "ratio": "1:1", "duration": 3, "watermark": false } }, "webhook_url": "https://your-webhook.example.com"}'02 Response excerpt
Durable run accepted
{ "id": "e0a5c7b3-6d14-4f89-b2c1-9a8e3f5d70c6", "object": "chain_run", "chain_slug": "chain1", "chain_version": "2026-05-23", "mode": "byok", "status": "queued", "input": { "chain_models": { "text_to_image_model": "bfl/flux-2-flex", "image_to_video_model": "bytedance/seedance-1.5-pro" }, "text_to_image_params": { "prompt": "A futuristic wireless headphone product on a clean reflective pedestal, teal and violet studio lighting, premium product photography, soft shadows, high detail", "width": 1024, "height": 1024, "prompt_upsampling": false, "seed": 593, "safety_tolerance": 5, "output_format": "jpeg" }, "image_to_video_params": { "content": [ { "type": "text", "text": "Slow cinematic orbit around the product, subtle glow animation, premium studio reflections, smooth camera motion" } ], "ratio": "1:1", "duration": 3, "watermark": false } }, "created_at": "2026-05-26T20:15:11.866894+00:00", "updated_at": "2026-05-26T20:15:11.866894+00:00", "current_step_key": "processing", "steps": [ { "id": "5b7f2a91-c0e4-4d38-8f6a-1c9d7e3b42a5", "step_index": 0, "step_key": "text_to_image", "step_kind": "image", "model_identifier": "bfl/flux-2-flex", "status": "queued", "created_at": "2026-05-26T20:15:11.967529+00:00", "updated_at": "2026-05-26T20:15:11.967529+00:00", "depends_on": [], "started_at": null, "completed_at": null }, { "id": "9c1e4b7a-2f83-4d6c-a5b0-7e9f3a1d8c62", "step_index": 1, "step_key": "image_to_video", "step_kind": "video", "model_identifier": "bytedance/seedance-1.5-pro", "status": "queued", "created_at": "2026-05-26T20:15:11.967529+00:00", "updated_at": "2026-05-26T20:15:11.967529+00:00", "depends_on": [ "text_to_image" ], "started_at": null, "completed_at": null } ]}03 Result code
Fetch final state
curl --request GET \ --url https://your-babychain.example.com/api/v1/chains/get/{runId} \ --header "Authorization: Bearer BABYCHAIN_API_KEY"04 Result excerpt
Terminal payload
{ "id": "e0a5c7b3-6d14-4f89-b2c1-9a8e3f5d70c6", "object": "chain_run", "chain_slug": "chain1", "chain_version": "2026-05-23", "mode": "byok", "status": "succeeded", "input": { "chain_models": { "text_to_image_model": "bfl/flux-2-flex", "image_to_video_model": "bytedance/seedance-1.5-pro" }, "text_to_image_params": { "prompt": "A futuristic wireless headphone product on a clean reflective pedestal, teal and violet studio lighting, premium product photography, soft shadows, high detail", "width": 1024, "height": 1024, "prompt_upsampling": false, "seed": 593, "safety_tolerance": 5, "output_format": "jpeg" }, "image_to_video_params": { "content": [ { "type": "text", "text": "Slow cinematic orbit around the product, subtle glow animation, premium studio reflections, smooth camera motion" } ], "ratio": "1:1", "duration": 3, "watermark": false } }, "created_at": "2026-05-26T20:15:11.866894+00:00", "updated_at": "2026-05-26T20:17:39.695124+00:00", "current_step_key": "completed", "steps": [ { "id": "5b7f2a91-c0e4-4d38-8f6a-1c9d7e3b42a5", "step_index": 0, "step_key": "text_to_image", "step_kind": "image", "model_identifier": "bfl/flux-2-flex", "status": "succeeded", "created_at": "2026-05-26T20:15:11.967529+00:00", "updated_at": "2026-05-26T20:15:55.765222+00:00", "depends_on": [], "started_at": "2026-05-26T20:15:37.154+00:00", "completed_at": "2026-05-26T20:15:55.744+00:00", "generation_output_file": [ "https://example-storage.bfl.ai" ] }, { "id": "9c1e4b7a-2f83-4d6c-a5b0-7e9f3a1d8c62", "step_index": 1, "step_key": "image_to_video", "step_kind": "video", "model_identifier": "bytedance/seedance-1.5-pro", "status": "succeeded", "created_at": "2026-05-26T20:15:11.967529+00:00", "updated_at": "2026-05-26T20:17:39.604698+00:00", "depends_on": [ "text_to_image" ], "started_at": "2026-05-26T20:16:52.097+00:00", "completed_at": "2026-05-26T20:17:39.577+00:00", "generation_input_file": [ "https://example-storage.bfl.ai" ], "generation_output_file": [ "https://example-storage.ark-byteplus.com" ] } ]}Chain run lifecycle
From one request to one final callback.
BabyChain turns one API call into a durable model pipeline: receive input, run each step, pass outputs forward, recover async state, and deliver the final callback.
Accept one chain request
Receive caller input, step params, model choices, idempotency key, metadata, and callback URL.
Run model steps in order
Start one generation step at a time and pass each successful output URL into the next compatible model.
Recover async execution
Use webhooks and cron fallback to advance durable run state without blocking the caller app.
Deliver final callback
Send a signed terminal payload with final outputs, step statuses, and backend metadata when a callback URL is configured.
Ship your chain API engine