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AgentRXI GPT-OSS-20B Chat Completions
x402
AgentRXI GPT-OSS-20B Chat Completions is a paid API for AI agents from agentrxi.com, paid per call via x402, $0.003856/call, status unknown (last checked 2026-10-15).
OpenAI-compatible chat completions using the GPT-OSS-20B open-weight reasoning model with tool calling, billed per token via x402 micropayments
Price / call$0.003856
Success—
StatusUnknown
How this service works
OpenAI-compatible chat completions on OpenAI gpt-oss-20b open-weight reasoning model with tool calling. Set your OpenAI SDK base URL to https://agentrxi.com/v1/gpt-oss-20b and pay per token with x402 instead of an API key: $0.6 per million input and $0.9 per million output tokens, minimum $0.002 a call, at most $0.0099. The 402 quotes your request's maximum; "upto" payers are charged only the tokens used. Same request/response shape as OpenAI (tool calling, reasoning, streami
Output
Returns an OpenAI-format chat completion JSON object with the assistant's message, finish reason, token usage breakdown (prompt, completion, total), model name, and a unique completion ID. Streaming is supported for incremental token delivery.
Example use cases
Reasoning over a math problem
“Use the GPT-OSS-20B reasoning model to solve this algebra problem step by step: if 3x + 7 = 22, what is x? Keep the response concise.”
On-demand chat with tool calling
“Send this message to GPT-OSS-20B with tool calling enabled: 'What is the current weather in Paris?' and let it decide which tool to invoke.”
Low-cost LLM for agent pipeline
“I need to classify this customer support message as billing, technical, or general inquiry using a cheap per-token reasoning model — run it through GPT-OSS-20B: 'My invoice is wrong this month.'”
Technical details
Endpoint
GEThttps://agentrxi.com/v1/gpt-oss-20b/chat/completions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need OpenAI SDK-compatible chat completions without a long-term API key subscription, want per-call or per-token micropayment billing via x402 USDC, require a capable open-weight reasoning model (20B scale), or want tool calling and streaming at a low cost ceiling ($0.0099 max per call). Prefer over larger proprietary models when cost control and open-weight transparency matter.
Side effects
- Insufficient x402 payment or balance leads to 402 Payment Required response
- Prompt or max_tokens exceeds model context window returns a 400 error
- Temperature or parameter validation failures return 422 Unprocessable Entity
- Model unavailability or upstream inference errors return 503 Service Unavailable
- Malformed JSON in request body returns 400 Bad Request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "chatcmpl-...",
"model": "gpt-oss-20b",
"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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