onvexia.com

Live 402 challenge

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

{
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x54F57D0FE2FFBa8C8111fc89D4a0E624D53Dd0e3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxAmountRequired": "1000",
      "maxTimeoutSeconds": 60
    }
  ],
  "message": "Pay per call with x402 (USDC on Base), or use a free account: FREE ACCESS IS ON until 31 December 2026. Sign up at https://onvexia.com/signup and every endpoint, including this one, costs nothing.",
  "resource": {
    "url": "https://onvexia.com/v1/chain/exchange-netflow",
    "mimeType": "application/json",
    "description": "Exchange netflow. Daily exchange in/out flow with per-chain coverage stated beside it."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "day": "",
            "chain": ""
          }
        },
        "output": {
          "type": "json",
          "example": {
            "data": [],
            "meta": {
              "docs": "https://onvexia.com/openapi.json",
              "endpoint": "/v1/chain/exchange-netflow"
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "type": "object",
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "day": {
                    "type": "string",
                    "description": "ISO date"
                  },
                  "chain": {
                    "type": "string",
                    "description": "Chain slug"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "properties": {
              "example": {
                "type": "object",
                "properties": {
                  "data": {
                    "description": "The result: an array or object depending on the endpoint. An empty array means no rows in range, never that the metric is unsupported."
                  },
                  "meta": {
                    "type": "object",
                    "description": "Coverage and provenance: what was measured, and what is not held. A null label means no label is held, never that the subject is safe."
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2,
  "documentation": "https://onvexia.com/openapi.json"
}

Accepts

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

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x54F57D0FE2FFBa8C8111fc89D4a0E624D53Dd0e3",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://onvexia.com/v1/chain/exchange-netflow",
    "description": "",
    "maxAmountRequired": "1000",
    "maxTimeoutSeconds": 60
  }
]

Provenance

Seen in the source catalog

2026-10-20 15:11Z

Last indexed by Roundhouse

2026-10-24 01:45Z

Last enriched (probe, favicon, geo)

2026-10-15 13:45Z

x402 version

1

Max timeout

60s

Liveness probe

HTTP 402