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CortexCloud Messages API (OpenAI-compatible, x402)
x402
CortexCloud Messages API (OpenAI-compatible, x402) is a paid API for AI agents from api.cortexcloud.org, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Sends chat completion messages to an OpenAI-compatible LLM endpoint, paying per call in USDC on Base via x402 with no API key required.
Price / call$0.005
Success—
StatusUnknown
How this service works
OpenAI-compatible AI and data API for agents. Pay per call in USDC on Base via x402 — no API keys, no subscriptions, no lock-in.
Output
Returns an OpenAI-compatible chat completion JSON object containing the AI-generated assistant message, model used, token usage statistics, and finish reason. The response mirrors the standard OpenAI /v1/chat/completions response format.
Example use cases
Keyless LLM for autonomous agent pipeline
“I'm building an autonomous agent that needs to call an LLM without managing API keys or subscriptions — use CortexCloud to send 'Summarize this support ticket: customer reports login failure after password reset' to gpt-3.5-turbo with max 200 tokens, paying per call in USDC.”
One-off AI answer with crypto micropayment
“Ask the CortexCloud AI: 'What are three best practices for writing unit tests in Python?' using gpt-4 with max 300 tokens — I want to pay per call in USDC on Base, no account needed.”
On-demand content generation without subscription
“Use the pay-per-call Cortex AI to generate a short product description for 'a reusable silicone food storage bag' — send it as a chat message to gpt-3.5-turbo with max 100 tokens and pay the $0.005 USDC fee automatically.”
Technical details
Endpoint
GEThttps://api.cortexcloud.org/x402/v1/messagesWhen to prefer
Choose this endpoint when you need OpenAI-compatible LLM inference without committing to an API key or subscription, especially in agentic or automated pipelines that already handle x402/USDC micropayments on Base. It is ideal for pay-as-you-go usage patterns, wallet-native AI agents, or scenarios where avoiding vendor lock-in and account management overhead is a priority.
Side effects
- Insufficient USDC balance on Base — payment fails with 402 Payment Required
- Invalid or unsupported model name — returns 400 or model error
- Malformed messages array — returns validation error
- max_tokens exceeds model context limit — returns parameter error
- Network or service downtime — returns 5xx error
- Payment transaction not confirmed on Base — request not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | |
| messages | array | |
| max_tokens | integer |
Output
Schema · Response
{
"type": "object",
"format": "application/json",
"example": {}
}Tags
x402
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