ApiLux

Chat Completions

Generate text, returned in the familiar OpenAI response shape.

ImplementedAvailability depends on the selected model being enabled and priced in ApiLux.

Request

POST/chat/completions

Requires the Authorization: Bearer apl_... header

FieldTypeDescription
modelrequiredstringPublic model ID from GET /models.
messagesrequiredMessage[]Array of { role, content } where role is system | user | assistant.
streamfalseOnly false is accepted today. Sending true is rejected explicitly rather than silently returning a non-streamed body.

Response

FieldTypeDescription
choices[0].message.contentrequiredstringThe generated content.
usagerequiredobjectprompt_tokens, completion_tokens, total_tokens.
apilux.credit_chargedrequiredintegerCredits charged for this request.
apilux.balance_afterrequiredintegerWallet balance after the charge.

Billing

By total tokens (input + output), priced per 1,000,000 tokens. Minimum 1 credit per successful request.

Examples

cURL
curl https://apilux.net/api/v1/chat/completions \
  -H "Authorization: Bearer apl_YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "MODEL_ID",
    "messages": [{ "role": "user", "content": "Xin chào" }]
  }'
Node.js
const res = await fetch("https://apilux.net/api/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.APILUX_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    model: "MODEL_ID",
    messages: [{ role: "user", content: "Xin chào" }],
  }),
});
const data = await res.json();
console.log(data.choices[0].message.content);
Python
import os, requests

res = requests.post(
    "https://apilux.net/api/v1/chat/completions",
    headers={
        "Authorization": f"Bearer {os.environ['APILUX_API_KEY']}",
        "Content-Type": "application/json",
    },
    json={
        "model": "MODEL_ID",
        "messages": [{"role": "user", "content": "Xin chào"}],
    },
)
print(res.json()["choices"][0]["message"]["content"])

Errors

HTTPCodeMeaning
400invalid_requestInvalid body (missing field, wrong type, value out of range).
401auth_missing_or_malformedMissing Authorization header, or it is not in the Bearer apl_... form.
401auth_invalidThe API key does not exist.
401auth_revokedThe API key has been revoked.
401auth_expiredThe API key has expired.
400unknown_modelThe model does not exist on ApiLux.
400capability_not_supportedThe model exists but cannot be used on this endpoint (e.g. a text model on an image endpoint).
503pricing_not_configuredThe model is implemented but has no price configured on ApiLux yet. This is our state, not a client error.
503model_disabledThe model is currently disabled.
503model_temporarily_unavailableThe model is enabled and priced, but the upstream provider is not currently serving it. This is temporary and can clear on its own — the model reappears in GET /v1/models once the provider serves it again. You are not charged and no provider call is made.
402insufficient_balanceWallet balance is not enough for this request.
429api_key_limit_exceededThis API key hit a limit you configured yourself. The wallet still has funds — only this key is capped until the window resets. The response carries limit_type (spending | requests | tokens) and period (daily | monthly | lifetime). Token limits on text endpoints are measured from actual usage, so the total can exceed the limit by at most one request.
503api_key_quota_reconciliation_requiredAn earlier text request on this same key has not been reconciled yet. The usual cause: the provider returned a successful result without token usage, so the token limit for that window can no longer be trusted and ApiLux stops rather than let the limit be exceeded silently. Retrying will not help until that is done — contact support. You are not charged for the blocked request, no provider call is made, and image/video endpoints are unaffected.
502upstream_errorThe model provider failed. You are not charged.
504upstream_timeoutThe provider did not respond in time. You are not charged.
429upstream_rate_limitedRate limited. Retry after a few seconds.

Notes

The response carries an extra apilux object beyond the OpenAI shape. OpenAI clients ignore unknown fields, so nothing breaks.