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Token4u AI Chat Completions
x402
Token4u AI Chat Completions is a paid API for AI agents from token4u.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Pay-per-request AI chat completion endpoint using x402 micro-USDC payments, returning OpenAI-compatible responses
Price / call$0.003
Success—
StatusUnknown
How this service works
gpt-4o-mini API call (~128 tokens)
Output
Returns an OpenAI-compatible chat.completion JSON object containing: a unique completion ID, the model name used, the assistant's reply message with role and content, a finish_reason (e.g. 'stop'), and a usage object with prompt_tokens, completion_tokens, and total_tokens counts.
Example use cases
Crypto-native AI chatbot backend
“I'm building a Web3 app and need an AI chat backend that bills users automatically in USDC per message — use Token4u to send 'Explain what a smart contract is in one sentence' and return the response.”
Pay-as-you-go LLM for agent pipeline
“My automation pipeline needs to call an AI model only a few times a day, so I don't want a subscription — use Token4u with gpt-4o-mini to complete the prompt 'Summarize this meeting transcript in bullet points' and show me the response and token usage.”
Low-cost AI response for content draft
“Can you use Token4u to generate a short product description for a pair of wireless headphones — just pay the micropayment per request and give me the text back?”
Technical details
Endpoint
POSThttps://token4u.ai/v1/chat/completionsWhen to prefer
Choose Token4u when you need OpenAI-compatible chat completions with no subscription or API key setup, billing strictly per request in micro-USDC via the x402 protocol. It is ideal for autonomous AI agents, crypto-native applications, or low-frequency use cases where pay-as-you-go micropayment billing is preferable to flat-rate plans. Prefer it over standard OpenAI direct access when you want on-chain or USDC-denominated billing with minimal credential management.
Side effects
- Payment not included or insufficient USDC — returns HTTP 402 Payment Required
- Invalid or malformed message array — returns 400 Bad Request
- Unsupported model name specified — returns 400 or 404
- Upstream LLM provider timeout — returns 502 or 503
- Rate limit exceeded — returns 429 Too Many Requests
- Network or gateway error — returns 500 Internal Server Error
Output
Schema · Response
{
"type": "json",
"schema": {
"type": "object",
"required": [
"id",
"object",
"created",
"model",
"choices",
"usage"
],
"properties": {
"id": {
"type": "string"
},
"model": {
"type": "string"
},
"usage": {
"type": "object",
"required": [
"prompt_tokens",
"completion_tokens",
"total_tokens"
],
"properties": {
"total_tokens": {
"type": "integer"
},
"prompt_tokens": {
"type": "integer"
},
"completion_tokens": {
"type": "integer"
}
}
},
"object": {
"enum": [
"chat.completion"
],
"type": "string"
},
"choices": {
"type": "array",
"items": {
"type": "object",
"required": [
"index",
"message",
"finish_reason"
],
"properties": {
"index": {
"type": "integer"
},
"message": {
"type": "object",
"required": [
"role",
"content"
],
"properties": {
"role": {
"type": "string"
},
"content": {
"type": "string"
}
}
},
"finish_reason": {
"type": "string"
}
}
}
},
"created": {
"type": "integer"
}
}
},
"example": {
"id": "chatcmpl-abc123",
"model": "gpt-4o-mini",
"usage": {
"total_tokens": 18,
"prompt_tokens": 10,
"completion_tokens": 8
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello! How can I help you today?"
},
"finish_reason": "stop"
}
],
"created": 1753000000
},
"payload": {
"id": "chatcmpl-abc123",
"model": "gpt-4o-mini",
"usage": {
"total_tokens": 18,
"prompt_tokens": 10,
"completion_tokens": 8
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello! How can I help you today?"
},
"finish_reason": "stop"
}
],
"created": 1753000000
}
}Tags
x402
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