OpenAI-compatible LLM inference and chat completions via discounted Venice API credits

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x213c8d7434E2ae7AA1C392767c5120778D413215",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "category": "Inference",
    "discoverable": true,
    "info": {
      "input": {
        "body": {
          "usdPaid": 1
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "purchase": {
            "creditsIssuedUsd": 2,
            "dates": [
              "2026-04-25"
            ],
            "discountMultiplier": 0.5,
            "expiresAt": "2026-04-25T23:59:59.000Z",
            "id": "purchase_01HEXAMPLE",
            "ids": [
              "purchase_01HEXAMPLE"
            ],
            "purchaseMode": "spot",
            "settlementTxHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
            "usdPaid": 1
          },
          "success": true,
          "veniceApiKey": "vn-...live-key...",
          "veniceKeyLast6": "abc123"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": false,
              "properties": {
                "dailyReservedUsd": {
                  "description": "Daily credit reserve amount in Venice API credits per UTC day. Required when purchaseMode=\"prepaid\". Must fit unreserved capacity for the start date and be at least one-seventh of the reserve balance.",
                  "type": "number"
                },
                "paymentSessionId": {
                  "description": "Opaque session ID returned in a prior 402 response; echo it back on retry.",
                  "type": "string"
                },
                "purchaseMode": {
                  "description": "Use \"spot\" for Same-Day Credits or \"prepaid\" for a Prepaid API Key with prepaid balance and daily credit reserve.",
                  "enum": [
                    "spot",
                    "prepaid"
                  ],
                  "type": "string"
                },
                "reserveStart": {
                  "description": "Prepaid API Key daily credit reserve start. New Prepaid API Keys start tomorrow UTC; use Same-Day Credits for work today.",
                  "enum": [
                    "tomorrow"
                  ],
                  "type": "string"
                },
                "topUpKeyLast6": {
                  "description": "Optional last 6 characters of a wallet-owned active Prepaid API Key to top up.",
                  "type": "string"
                },
                "usdPaid": {
                  "description": "Discounted USD amount to pay for Venice API credits. Minimum is based on receiving at least $0.50 in credits after current time-based pricing.",
                  "minimum": 0.01,
                  "type": "number"
                }
              },
              "required": [
                "usdPaid"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    },
    "tags": [
      "inference",
      "llm",
      "openai",
      "chat-completions",
      "ai"
    ]
  }
}

curl "https://cheaptokens.ai/api/buy"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://cheaptokens.ai/api/buy");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://cheaptokens.ai/api/buy")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header