Antimatter

POST/v1/stillsAPI key

Validated, priced at exactly the options sent and held at that worst case with the margin, then submitted to the cheapest provider for those options (fal, Replicate, or the model's maker bought direct); answers the queued job at once. Paid from a balance, never the free allowance. Stopped past 10 minutes. Models: minimax/image-01, black-forest-labs/flux-schnell, google/nano-banana-2.1, google/nano-banana-pro, google/nano-banana-pro-edit, kwaivgi/kling-o1-image, runwayml/gen4-image. A 404 while the media jobs are off.

Request body

application/json, required

Request body fields
Field	Type	What it is
modelrequired	string	A model this door serves; /videos, /sounds and /meshes list them, and GET /v1/stills names the stills. At most 200 characters.
prompt	string	What to make. Optional only for a 3D model made from image_url. At most 20000 characters.
seconds	number or string	The length asked for, a number or a numeric string as OpenAI sends it.
size	string	Videos only: WIDTHxHEIGHT, read as a resolution and an aspect ratio.
resolution	string	At most 10 characters.
aspect_ratio	string	At most 8 characters.
audio	boolean	Whether a video model that can make sound does; its own default unless set.
image_url	string	An https picture a 3D model starts from. Sent, never kept.
reference_images	array of string	Pictures a model keeps a subject from, or a still is made from, as many as the model takes. Sent, never kept.
end_image_url	string	The last frame, for a model that starts from a picture and takes one. Sent, never kept.
lyrics	string	The words a model that sings is given. At most 3000 characters.
negative_prompt	string	At most 2000 characters.
seed	integer	From 0 to 2147483647.

Example

{
  "model": "antimatter/auto",
  "prompt": "Say hello in five words."
}

Answer 200

The job, queued.

Headers: x-antimatter-hold-micros

Fields of the 200 answer
Field	Type	What it is
idrequired	string	video_, sound_, mesh_ or still_ then 24 hex digits.
objectrequired	string	One of "video", "sound", "mesh", "still".
modelrequired	string
statusrequired	string	One of "queued", "in_progress", "completed", "failed", "cancelled".
progress	integer	0 until completed, then 100.
created_atrequired	integer
completed_at	integer or null
expires_at	integer or null	When the file stops being fetchable: 60 minutes after completion.
prompt	string or null
seconds	string
size	string
resolution	string
aspect_ratio	string
audio	boolean
reference_count	integer	How many reference pictures it was sent; the pictures are not kept.
content_type	string or null
hold_microsrequired	integer	The worst case held while it runs.
cost_micros	integer or null	What it was billed, never past the hold.
cancel_requested	boolean
error	object or null	generation_failed, deadline_exceeded, provider_unanswered (billed its hold), submit_lost or model_unavailable.
error.code	string
error.message	string

Errors

400OpenAI shaped error.
402OpenAI shaped error.
403OpenAI shaped error.
404OpenAI shaped error.
429OpenAI shaped error.
502OpenAI shaped error.

Every error answers in one shape, with its type, code and the field it names. The whole list is in the docs' Errors section.

Try it

The same call with curl

curl -X POST https://useantimatter.com/v1/stills \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"antimatter/auto","prompt":"Say hello in five words."}'