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api.zfinia.com

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OtherLiveeip155:8453Exactvia cdp
https://api.zfinia.com/x402/v1/accessibility-contrast-calculator
Calls · 30d
6→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 24 snapshots so far.
$0.35
Verified settled volume
36 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.
6
Calls · 30d
Upstream's own call count for this endpoint, not ours.
4
Unique payers · 30d
Last called 2026-09-17 04:07Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x25e8245f07d5e4873987293dad666afbe56a9608

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 required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://api.zfinia.com/x402/v1/accessibility-contrast-calculator",
    "tags": [
      "WCAG",
      "contrast ratio",
      "accessibility",
      "sRGB",
      "colour validation"
    ],
    "mimeType": "application/json",
    "description": "Calculate WCAG 2.x sRGB contrast for one caller-supplied foreground/background pair of hex colours (#RRGGBB). Returns JSON with the contrast ratio and AA/AAA threshold booleans for normal or large text. Does not assess a whole interface, support alpha colours or certify accessibility.",
    "serviceName": "WCAG Contrast Calculator"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "background": "#ffffff",
            "foreground": "#000000",
            "large_text": false
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "wcag_aa": true,
            "wcag_aaa": true,
            "large_text": false,
            "request_id": "example-request",
            "service_id": "accessibility_contrast_calculator",
            "limitations": [
              "Calculation uses WCAG 2.x sRGB contrast; it does not assess full interface accessibility."
            ],
            "contrast_ratio": 21,
            "service_version": "1.0.0"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "foreground",
                  "background",
                  "large_text"
                ],
                "properties": {
                  "background": {
                    "type": "string",
                    "pattern": "^#[0-9a-fA-F]{6}$"
                  },
                  "foreground": {
                    "type": "string",
                    "pattern": "^#[0-9a-fA-F]{6}$"
                  },
                  "large_text": {
                    "type": "boolean"
                  }
                },
                "additionalProperties": false
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "required": [
                  "request_id",
                  "service_id",
                  "service_version",
                  "contrast_ratio",
                  "wcag_aa",
                  "wcag_aaa",
                  "large_text",
                  "limitations"
                ],
                "properties": {
                  "wcag_aa": {
                    "type": "boolean"
                  },
                  "wcag_aaa": {
                    "type": "boolean"
                  },
                  "large_text": {
                    "type": "boolean"
                  },
                  "request_id": {
                    "type": "string",
                    "description": "Delivery request identifier; also returned in x-foundry-request-id."
                  },
                  "service_id": {
                    "type": "string",
                    "description": "Canonical service identifier."
                  },
                  "limitations": {
                    "type": "array"
                  },
                  "contrast_ratio": {
                    "type": "number"
                  },
                  "service_version": {
                    "type": "string",
                    "description": "Version of the invoked service."
                  }
                },
                "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 0x25e8…a9608. The signed payment is good for 1 minute.

Paid to
0x25e8…a9608
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
1000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "background": "#ffffff",
          "foreground": "#000000",
          "large_text": false
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "wcag_aa": true,
          "wcag_aaa": true,
          "large_text": false,
          "request_id": "example-request",
          "service_id": "accessibility_contrast_calculator",
          "limitations": [
            "Calculation uses WCAG 2.x sRGB contrast; it does not assess full interface accessibility."
          ],
          "contrast_ratio": 21,
          "service_version": "1.0.0"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "foreground",
                "background",
                "large_text"
              ],
              "properties": {
                "background": {
                  "type": "string",
                  "pattern": "^#[0-9a-fA-F]{6}$"
                },
                "foreground": {
                  "type": "string",
                  "pattern": "^#[0-9a-fA-F]{6}$"
                },
                "large_text": {
                  "type": "boolean"
                }
              },
              "additionalProperties": false
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "request_id",
                "service_id",
                "service_version",
                "contrast_ratio",
                "wcag_aa",
                "wcag_aaa",
                "large_text",
                "limitations"
              ],
              "properties": {
                "wcag_aa": {
                  "type": "boolean"
                },
                "wcag_aaa": {
                  "type": "boolean"
                },
                "large_text": {
                  "type": "boolean"
                },
                "request_id": {
                  "type": "string",
                  "description": "Delivery request identifier; also returned in x-foundry-request-id."
                },
                "service_id": {
                  "type": "string",
                  "description": "Canonical service identifier."
                },
                "limitations": {
                  "type": "array"
                },
                "contrast_ratio": {
                  "type": "number"
                },
                "service_version": {
                  "type": "string",
                  "description": "Version of the invoked service."
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-17 04:07Z
Last indexed by Roundhouse
2026-09-24 00:40Z
Last enriched (probe, favicon, geo)
2026-09-23 03:45Z
x402 version
2
Max timeout
60s
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. 24 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 api.zfinia.com 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=api.zfinia.com'
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://api.zfinia.com/x402/v1/accessibility-contrast-calculator, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

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