Roundhouse

Linkrra Synap: Open-Model LLMs

Linkrra Synap: Qwen3 30B A3B Instruct 2507 (model "qwen/qwen3-30b-a3b") - general, high-throughput. OpenAI-compatible chat completions for this one model, 64K context, served only on our own GPUs, 4-bit AWQ. Pay per call in USDC on Base via x402 - no account, no API key. From $0.001 per call, usage-priced per token above that (GET /v1/models). Streaming supported. Product site: https://synap.linkrra.com

InferenceLiveeip155:8453Exactvia cdp
https://pool.linkrra.com/api/billing/x402/models/qwen3-30b-a3b/chat/completions
InferenceLlmChat-completionOpenai-compatibleAi-compute
Calls · 30d
7
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$1.55
Verified settled volume
109 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
7
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-22 20:33Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xAA0a350f6080940c138A8A50C0Fa8c8387782eb4

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "PAYMENT-SIGNATURE header is required",
  "quote": {
    "note": "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 $0.001 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.",
    "model": "qwen/qwen3-30b-a3b",
    "amountUsd": 0.001,
    "maxOutputTokens": 4096,
    "minimumChargeUsd": 0.001,
    "pricePerMillionCreditsUsd": 0.2273
  },
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xAA0a350f6080940c138A8A50C0Fa8c8387782eb4",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://pool.linkrra.com/api/billing/x402/models/qwen3-30b-a3b/chat/completions",
    "tags": [
      "inference",
      "llm",
      "chat-completion",
      "openai-compatible",
      "ai-compute"
    ],
    "iconUrl": "https://linkrra.com/favicon-512.png",
    "mimeType": "application/json",
    "description": "Linkrra Synap: Qwen3 30B A3B Instruct 2507 (model \"qwen/qwen3-30b-a3b\") - general, high-throughput. OpenAI-compatible chat completions for this one model, 64K context, served only on our own GPUs, 4-bit AWQ. Pay per call in USDC on Base via x402 - no account, no API key. From $0.001 per call, usage-priced per token above that (GET /v1/models). Streaming supported. Product site: https://synap.linkrra.com",
    "serviceName": "Linkrra Synap: Open-Model LLMs"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "model": "qwen/qwen3-30b-a3b",
            "stream": false,
            "messages": [
              {
                "role": "user",
                "content": "Write a Python function that reverses a string"
              }
            ],
            "max_tokens": 256
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "id": "chatcmpl-...",
            "model": "qwen/qwen3-30b-a3b",
            "usage": {
              "total_tokens": 28,
              "prompt_tokens": 16,
              "completion_tokens": 12
            },
            "object": "chat.completion",
            "choices": [
              {
                "message": {
                  "role": "assistant",
                  "content": "def reverse(s):\n    return s[::-1]"
                }
              }
            ],
            "payment": {
              "network": "eip155:8453",
              "paidUsd": 0.001,
              "transaction": "0x..."
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input",
          "output"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "messages"
                ],
                "properties": {
                  "model": {
                    "enum": [
                      "qwen/qwen3-30b-a3b"
                    ],
                    "type": "string",
                    "description": "Optional: this endpoint always runs qwen/qwen3-30b-a3b."
                  },
                  "stream": {
                    "type": "boolean",
                    "default": false,
                    "description": "true = stream OpenAI-format Server-Sent Events."
                  },
                  "messages": {
                    "type": "array",
                    "items": {
                      "type": "object",
                      "required": [
                        "role",
                        "content"
                      ],
                      "properties": {
                        "role": {
                          "enum": [
                            "system",
                            "user",
                            "assistant",
                            "tool"
                          ],
                          "type": "string"
                        },
                        "content": {
                          "description": "Text, or an array of OpenAI content parts."
                        }
                      }
                    },
                    "examples": [
                      [
                        {
                          "role": "user",
                          "content": "Write a Python function that reverses a string"
                        }
                      ]
                    ],
                    "minItems": 1,
                    "description": "OpenAI-format chat history, oldest first: [{role, content}]."
                  },
                  "max_tokens": {
                    "type": "integer",
                    "default": 4096,
                    "maximum": 4096,
                    "minimum": 1,
                    "description": "Completion token cap. The price is quoted for the prompt plus this cap."
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type",
              "example"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "properties": {
                  "model": {
                    "type": "string",
                    "description": "The model that answered."
                  },
                  "usage": {
                    "type": "object",
                    "description": "Tokens billed: prompt, completion, total."
                  },
                  "choices": {
                    "type": "array",
                    "description": "choices[0].message.content is the reply."
                  },
                  "payment": {
                    "type": "object",
                    "description": "USDC paid + Base tx hash; any unused amount stays credited to the payer."
                  }
                }
              }
            },
            "description": "200 chat.completion (SSE if stream=true). 402 payment required or insufficient (challenge in PAYMENT-REQUIRED). 202 settlement pending. 400 invalid body or payment header. 404 model not offered. 409 payment already used. 503 no node serving the model, nothing charged. 500/502 facilitator, chain or model-server error; if inference fails after settlement the amount stays credited to the paying wallet."
          }
        }
      }
    },
    "builder-code": {
      "info": {
        "a": "bc_66yn2s8l"
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "a": {
            "type": "string",
            "pattern": "^[a-z0-9_]{1,32}$",
            "description": "App builder code"
          },
          "s": {
            "type": "array",
            "items": {
              "type": "string",
              "pattern": "^[a-z0-9_]{1,32}$"
            },
            "maxItems": 11,
            "description": "Service builder codes"
          },
          "w": {
            "type": "string",
            "pattern": "^[a-z0-9_]{1,32}$",
            "description": "Wallet builder code"
          }
        },
        "additionalProperties": false
      }
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.001USDC≈ $0.001 USD
on Base · exact scheme

Pay 0.001 USDC on Base to 0xAA0a…82eb4. The signed payment is good for 2 minutes.

Paid to
0xAA0a…82eb4
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
1000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xAA0a350f6080940c138A8A50C0Fa8c8387782eb4",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "model": "qwen/qwen3-30b-a3b",
          "stream": false,
          "messages": [
            {
              "role": "user",
              "content": "Write a Python function that reverses a string"
            }
          ],
          "max_tokens": 256
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "id": "chatcmpl-...",
          "model": "qwen/qwen3-30b-a3b",
          "usage": {
            "total_tokens": 28,
            "prompt_tokens": 16,
            "completion_tokens": 12
          },
          "object": "chat.completion",
          "choices": [
            {
              "message": {
                "role": "assistant",
                "content": "def reverse(s):\n    return s[::-1]"
              }
            }
          ],
          "payment": {
            "network": "eip155:8453",
            "paidUsd": 0.001,
            "transaction": "0x..."
          }
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input",
        "output"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "messages"
              ],
              "properties": {
                "model": {
                  "enum": [
                    "qwen/qwen3-30b-a3b"
                  ],
                  "type": "string",
                  "description": "Optional: this endpoint always runs qwen/qwen3-30b-a3b."
                },
                "stream": {
                  "type": "boolean",
                  "default": false,
                  "description": "true = stream OpenAI-format Server-Sent Events."
                },
                "messages": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "required": [
                      "role",
                      "content"
                    ],
                    "properties": {
                      "role": {
                        "enum": [
                          "system",
                          "user",
                          "assistant",
                          "tool"
                        ],
                        "type": "string"
                      },
                      "content": {
                        "description": "Text, or an array of OpenAI content parts."
                      }
                    }
                  },
                  "examples": [
                    [
                      {
                        "role": "user",
                        "content": "Write a Python function that reverses a string"
                      }
                    ]
                  ],
                  "minItems": 1,
                  "description": "OpenAI-format chat history, oldest first: [{role, content}]."
                },
                "max_tokens": {
                  "type": "integer",
                  "default": 4096,
                  "maximum": 4096,
                  "minimum": 1,
                  "description": "Completion token cap. The price is quoted for the prompt plus this cap."
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type",
            "example"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "properties": {
                "model": {
                  "type": "string",
                  "description": "The model that answered."
                },
                "usage": {
                  "type": "object",
                  "description": "Tokens billed: prompt, completion, total."
                },
                "choices": {
                  "type": "array",
                  "description": "choices[0].message.content is the reply."
                },
                "payment": {
                  "type": "object",
                  "description": "USDC paid + Base tx hash; any unused amount stays credited to the payer."
                }
              }
            }
          },
          "description": "200 chat.completion (SSE if stream=true). 402 payment required or insufficient (challenge in PAYMENT-REQUIRED). 202 settlement pending. 400 invalid body or payment header. 404 model not offered. 409 payment already used. 503 no node serving the model, nothing charged. 500/502 facilitator, chain or model-server error; if inference fails after settlement the amount stays credited to the paying wallet."
        }
      }
    }
  },
  "builder-code": {
    "info": {
      "a": "bc_66yn2s8l"
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "a": {
          "type": "string",
          "pattern": "^[a-z0-9_]{1,32}$",
          "description": "App builder code"
        },
        "s": {
          "type": "array",
          "items": {
            "type": "string",
            "pattern": "^[a-z0-9_]{1,32}$"
          },
          "maxItems": 11,
          "description": "Service builder codes"
        },
        "w": {
          "type": "string",
          "pattern": "^[a-z0-9_]{1,32}$",
          "description": "Wallet builder code"
        }
      },
      "additionalProperties": false
    }
  }
}

Provenance

Seen in the source catalog
2026-10-22 20:33Z
Last indexed by Roundhouse
2026-10-23 09:20Z
Last enriched (probe, favicon, geo)
2026-10-19 14:45Z
x402 version
2
Max timeout
120s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service Linkrra Synap: Open-Model LLMs and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Linkrra%20Synap%3A%20Open-Model%20LLMs'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://pool.linkrra.com/api/billing/x402/models/qwen3-30b-a3b/chat/completions, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.