Decisions (OpenAI wire)

OpenAI's Decisions API on its own wire: point an OpenAI SDK's base URL here and client.decisions.create works unchanged, paid per call. Send POST /v1/decisions with the required fields input and questions and pay $0.001 per call over x402 or MPP (there is no free tier). It returns the result.

Send input (text, or user messages with input_text parts) and questions; get back answers your code can branch on. predicate returns the probability a condition holds; choice returns one of your values with probabilities and confidence; score returns a probability-weighted position on your ordered levels. Up to 8 questions per call. Served by gpt-6-luna with jev-latest as fallback; the answer names the model that served, and fallback_from when the first was unavailable. Text input only. Model-backed, not deterministic.

Category: AI & compute · Tags: ai classify judgment routing openai decisions

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Parameters

Example request

curl -i -X POST https://agent402.tools/v1/decisions \
  -H "Content-Type: application/json" \
  -d '{"input":"I was charged twice for my order.","questions":[{"type":"choice","name":"department","instructions":"Which department should handle this complaint?","choices":[{"value":"billing","description":"Payments, invoices, and refunds."},{"value":"technical","description":"Problems using the product."},{"value":"shipping","description":"Delivery and tracking."},{"value":"other","description":"Requests outside these categories."}]}]}'

Without payment this returns HTTP 402 Payment Required with the exact price for decisions; any x402 v2 or MPP client pays it and retries.

Example response

{}

From an MCP client

catalog.call {
  "slug": "decisions",
  "params": {
    "input": "I was charged twice for my order.",
    "questions": [
      {
        "type": "choice",
        "name": "department",
        "instructions": "Which department should handle this complaint?",
        "choices": [
          {
            "value": "billing",
            "description": "Payments, invoices, and refunds."
          },
          {
            "value": "technical",
            "description": "Problems using the product."
          },
          {
            "value": "shipping",
            "description": "Delivery and tracking."
          },
          {
            "value": "other",
            "description": "Requests outside these categories."
          }
        ]
      }
    ]
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for decisions; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• input and questions are required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool runs a model, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• Model-backed: the answer is generated by a model, so the same input can produce different wording.
• A GET or HEAD to /v1/decisions returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB and a streamed response are not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/v1/decisions", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "input": "I was charged twice for my order.",
    "questions": [
      {
        "type": "choice",
        "name": "department",
        "instructions": "Which department should handle this complaint?",
        "choices": [
          {
            "value": "billing",
            "description": "Payments, invoices, and refunds."
          },
          {
            "value": "technical",
            "description": "Problems using the product."
          },
          {
            "value": "shipping",
            "description": "Delivery and tracking."
          },
          {
            "value": "other",
            "description": "Requests outside these categories."
          }
        ]
      }
    ]
  }),
});

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