Chat Completions

POST/api/v1/chat/completions

Sends a message to a model and returns its full reply. Non-streaming — the response is a single JSON object once the model finishes.

Request body

Field	Type	Required	Description
`model`	string	yes	A `modelId` from Models
`messages`	array	yes	`{ role, content }` objects, in order
`max_tokens`	number	no	Caps the reply length
`temperature`	number	no	Sampling temperature

json

{
  "model": "anthropic/claude-haiku-4.5",
  "messages": [
    { "role": "user", "content": "Explain wallets in one sentence." }
  ],
  "max_tokens": 200
}

Response

json

{
  "id": "string",
  "model": "string",
  "message": { "role": "assistant", "content": "string" },
  "usage": { "promptTokens": 0, "completionTokens": 0 },
  "cost": 0.0
}

Errors

Status	Meaning
`401`	Missing or invalid API key
`402`	Insufficient wallet balance
`403`	API key is inactive
`400`	`model` is missing or not in the catalog
`429`	A request from this key's account is already in progress
`502`	The model call itself failed — not billed