CORS Header Checker

Name: CORS Header Checker
Price: 0.01 USDC
Availability: InStock

Check which cross-origin permissions a URL grants for a given origin via the CORS Header Checker API for AI (via X402).

SearchLiveeip155:8453Exactvia cdp

https://cors-header-checker.underscoredone.com/check

Cors headersCorsCross originAccess-control-allow-originCors policy

Calls · 30d

3↑ 24%

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 27 snapshots so far.

$46.98

Verified settled volume

664 settlements proven x402 by their on-chain EIP-3009 marker.

$0.010

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-09-14 19:48Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08

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.

Accepts

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

0.01USDC≈ $0.01 USD

on Base · exact scheme

Pay 0.01 USDC on Base to 0xE974…C2F08. The signed payment is good for 5 minutes.

Paid to: 0xE974…C2F08
USD Coin contract: 0x8335…02913
Payment window: 5 minutes
As published: 10000 smallest units

10000units

on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 8ugAWA…zQT3b
Token contract: EPjFWd…TDt1v
Payment window: 5 minutes

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
    },
    "payTo": "8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b",
    "amount": "10000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "url": "https://api.github.com",
          "origin": "https://myapp.com"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "url": "https://api.github.com",
          "error": "",
          "status": 200,
          "headers": {
            "access-control-max-age": null,
            "access-control-allow-origin": "https://github.com",
            "access-control-allow-headers": null,
            "access-control-allow-methods": null,
            "access-control-expose-headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset",
            "access-control-allow-credentials": null
          },
          "api_version": "1.0.0",
          "cors_enabled": true,
          "origin_tested": "https://myapp.com",
          "origin_allowed": false
        }
      }
    },
    "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": [
                "url"
              ],
              "properties": {
                "url": {
                  "type": "string",
                  "description": "The full web address of the endpoint you want to check — must start with http:// or https://."
                },
                "origin": {
                  "type": "string",
                  "description": "The website address you want to test cross-origin access from, for example https://myapp.com. Defaults to https://example.com if you leave it out."
                }
              },
              "additionalProperties": false
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "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": [
                "api_version",
                "url",
                "origin_tested",
                "status",
                "cors_enabled",
                "origin_allowed",
                "headers",
                "error"
              ],
              "properties": {
                "url": {
                  "type": "string"
                },
                "error": {
                  "type": "string"
                },
                "status": {
                  "type": "integer"
                },
                "headers": {
                  "type": "object",
                  "additionalProperties": true
                },
                "api_version": {
                  "type": "string"
                },
                "cors_enabled": {
                  "type": "boolean"
                },
                "origin_tested": {
                  "type": "string"
                },
                "origin_allowed": {
                  "type": "boolean"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog: 2026-09-14 19:48Z
Last indexed by Roundhouse: 2026-09-24 07:20Z
Last enriched (probe, favicon, geo): 2026-09-11 18:46Z
x402 version: 2
Max timeout: 300s
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. 27 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 CORS Header Checker 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=CORS%20Header%20Checker'
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://cors-header-checker.underscoredone.com/check, 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.