GPT-OSS 20B chat API: pay per call, no API key

$0.002 per call · failed calls are never charged · no account or API key needed

Chat with OpenAI's open-weight gpt-oss-20b reasoning model (Apache 2.0) through one paid HTTP call: send a prompt and an optional system prompt, get the answer, up to 1,024 output tokens. Also reachable as model "gpt-oss-20b" on the OpenAI-compatible /v1/chat/completions. No account or provider key. Use when an agent wants this model by name.

Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
prompt (required)stringUser prompt, up to 8,000 characters
systemstringOptional system prompt, up to 2,000 characters
maxTokensintegerMaximum output tokens, 1-1024 (default 400)
temperaturenumber0-1.5 (default 0.6)

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/ai/model/gpt-oss-20b?prompt=Explain%20x402%20in%20one%20sentence."

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "model": "@cf/openai/gpt-oss-20b",
  "response": "x402 lets software pay for an HTTP request with a stablecoin by answering a 402 Payment Required challenge."
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is ai_model_gpt_oss_20b, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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