Synap by Linkrra

Endpoints and prices

Payment evidence

402 payload captured at 2026-10-14 13:50:00 UTC. Check evidence JSON · Measurement methodology.

{
  "error": "PAYMENT-SIGNATURE header is required — POST an OpenAI chat-completion body with it to pay",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xAA0a350f6080940c138A8A50C0Fa8c8387782eb4",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://pool.linkrra.com/api/billing/x402/chat/completions",
    "tags": [
      "inference",
      "llm",
      "chat-completion",
      "ai-compute"
    ],
    "mimeType": "application/json",
    "description": "Linkrra Synap inference — pay-per-call chat completion for model \"any catalogue model - generic quote, POST model + messages for an exact price\". Price covers up to 4096 output tokens at this model's own per-token price (see GET /v1/models), converted at $0.2273 per million credits. Minimum charge $0.01 per paid call. Unused tokens are not refunded in v1: the difference is credited to your paying wallet address on the topup ledger, to spend on another paid request.",
    "serviceName": "Linkrra Synap Inference"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "model": "string, required — see GET /v1/models for the catalogue",
            "stream": "boolean, optional",
            "messages": "array, OpenAI chat-completion message objects",
            "max_tokens": "number, optional, capped at 4096"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "id": "chatcmpl-...",
            "usage": {
              "total_tokens": 0,
              "prompt_tokens": 0,
              "completion_tokens": 0
            },
            "object": "chat.completion",
            "choices": [
              {
                "message": {
                  "role": "assistant",
                  "content": "..."
                }
              }
            ],
            "payment": {
              "network": "eip155:8453",
              "paidUsd": 0,
              "transaction": "0x..."
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "required": [
          "input",
          "output"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object"
              },
              "type": {
                "type": "string"
              },
              "method": {
                "type": "string"
              },
              "bodyType": {
                "type": "string"
              }
            }
          },
          "output": {
            "type": "object",
            "required": [
              "type",
              "example"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

{
  "error": "PAYMENT-SIGNATURE header is required — POST {\"amountUsd\": N} with it to pay",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xAA0a350f6080940c138A8A50C0Fa8c8387782eb4",
      "amount": "1000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://pool.linkrra.com/api/billing/x402/topup",
    "tags": [
      "inference",
      "llm",
      "credits",
      "ai-compute"
    ],
    "mimeType": "application/json",
    "description": "Linkrra inference credits — pay-as-you-go top-up ($1-$1000) at $0.2273/M tokens",
    "serviceName": "Linkrra Inference Credits"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "amountUsd": "number, 1-1000"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "ok": true,
            "balance": 4399472,
            "credits": 4399472
          }
        }
      },
      "schema": {
        "type": "object",
        "required": [
          "input",
          "output"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object"
              },
              "type": {
                "type": "string"
              },
              "method": {
                "type": "string"
              },
              "bodyType": {
                "type": "string"
              }
            }
          },
          "output": {
            "type": "object",
            "required": [
              "type",
              "example"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

{
  "error": "PAYMENT-SIGNATURE header is required — POST {\"text\": ...} with it to pay",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xAA0a350f6080940c138A8A50C0Fa8c8387782eb4",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://pool.linkrra.com/api/billing/x402/tts",
    "tags": [
      "tts",
      "text-to-speech",
      "audio",
      "voice"
    ],
    "mimeType": "audio/wav",
    "description": "Linkrra Voice TTS — pay-per-call text-to-speech for 0 characters. Returns a WAV clip. Price is computed from this exact text (no estimate, no overdraw), subject to a $0.01 minimum charge per paid call — a clip whose character-based price is below the minimum is quoted and settled at exactly the minimum. No refund path.",
    "serviceName": "Linkrra Voice TTS"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "text": "string, required, max 5000 characters",
            "nikud": "boolean, optional, default true — set false to skip Dicta vocalization for Hebrew text and pay the standard rate instead of the nikud premium",
            "sampleRate": "number, optional, default 24000"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "binary",
          "example": "<WAV file bytes>",
          "mimeType": "audio/wav"
        }
      },
      "schema": {
        "type": "object",
        "required": [
          "input",
          "output"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object"
              },
              "type": {
                "type": "string"
              },
              "method": {
                "type": "string"
              },
              "bodyType": {
                "type": "string"
              }
            }
          },
          "output": {
            "type": "object",
            "required": [
              "type",
              "mimeType"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "mimeType": {
                "type": "string"
              }
            }
          }
        }
      },
      "pricing": {
        "note": "this quote used the standard rate",
        "nikudPerMillionCharsUsd": 150,
        "standardPerMillionCharsUsd": 10
      }
    }
  },
  "x402Version": 2
}