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AgentRXI GPT-OSS 120B Chat Completions
x402
AgentRXI GPT-OSS 120B Chat Completions is a paid API for AI agents from agentrxi.com, paid per call via x402, $0.006629/call, status unknown (last checked 2026-10-15).
Generate chat completions using the GPT-OSS 120B open-source large language model, billed per token with no API key required.
Price / call$0.006629
Success—
StatusUnknown
How this service works
OpenAI-compatible chat completions on OpenAI gpt-oss-120b, the strongest open-weight OpenAI model, reasoning with tool calling. Set your OpenAI SDK base URL to https://agentrxi.com/v1/gpt-oss and pay per token with x402 instead of an API key: $1.05 per million input and $2.25 per million output tokens, minimum $0.002 a call, at most $0.0185. The 402 quotes your request's maximum; "upto" payers are charged only the tokens used. Same request/response shape as OpenAI (tool calli
Output
Returns an OpenAI-compatible chat completion JSON object including an assistant message, finish reason, model identifier ('gpt-oss-120b'), and token usage breakdown (prompt tokens, completion tokens, total tokens).
Example use cases
Keyless LLM call in agent pipeline
“I need to call a large open-source language model right now without setting up an account — just send the prompt 'Summarize the following in one sentence: Large language models are trained on vast datasets.' to GPT-OSS 120B and return the result.”
Crypto-native AI content generation
“Generate a short professional bio for a software engineer named Alex Rivera using GPT-OSS 120B — pay per call in USDC, no API key needed, and keep the output under 100 tokens.”
Multi-agent LLM reasoning step
“In my agent workflow I need a reasoning step — send this prompt to GPT-OSS 120B: 'Given that all mammals are warm-blooded and whales are mammals, are whales warm-blooded?' with a system message saying 'Answer concisely in one sentence' and a temperature of 0.2.”
Technical details
Endpoint
GEThttps://agentrxi.com/v1/gpt-oss/chat/completions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a large open-source chat model (120B parameters) without any signup, API key management, or subscription — especially in agent pipelines that already handle x402 USDC micropayments. Prefer it over managed LLM APIs when anonymity, pay-per-call economics, or avoiding vendor lock-in is a priority.
Side effects
- Insufficient USDC balance or failed x402 payment — request rejected before inference
- Prompt too long exceeding model context window — may return error or truncated output
- Invalid or missing 'prompt' query parameter — API returns validation error
- Temperature or max_tokens out of acceptable range — parameter validation failure
- Model temporarily unavailable or rate-limited on the AgentRXI marketplace
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "chatcmpl-...",
"model": "gpt-oss-120b",
"usage": {
"total_tokens": 18,
"prompt_tokens": 14,
"completion_tokens": 4
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Bonjour !"
},
"finish_reason": "stop"
}
]
}
}Tags
x402
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