Roundhouse

hcrb.in

Validate an ISIN (ISO 6166) by structure and Luhn mod-10 check digit over the A=10…Z=35 converted string.

OtherUnknowneip155:8453Exactvia cdp
https://hcrb.in/v1/tools/isin-check/call
Settlements · 30d
3,948↓ 60%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$10.15
Verified settled volume
1,289 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-26 14:14Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xc59c85e661d34084a7769f955d17fd38254a6235

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.

0.005USDC≈ $0.005 USD
on Base · exact scheme

Pay 0.005 USDC on Base to 0xc59c…a6235. The signed payment is good for 15 minutes.

Paid to
0xc59c…a6235
USD Coin contract
0x8335…02913
Payment window
15 minutes
As published
5000 smallest units
Buys
code402 isin-check
Returns
application/json
5000units
on Base · 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
0xc59c…a6235
Token contract
0x60a3…adb42
Payment window
15 minutes
Buys
code402 isin-check
Returns
application/json
5000units
on Polygon · 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
0xc59c…a6235
Token contract
0x3c49…c3359
Payment window
15 minutes
Buys
code402 isin-check
Returns
application/json
5000units
on eip155:43114 · 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
0xc59c…a6235
Token contract
0xB97E…48a6E
Payment window
15 minutes
Buys
code402 isin-check
Returns
application/json
5000units
on eip155:43114 · 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
0xc59c…a6235
Token contract
0xC891…c2ACD
Payment window
15 minutes
Buys
code402 isin-check
Returns
application/json
5000units
on Arbitrum · 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
0xc59c…a6235
Token contract
0xaf88…e5831
Payment window
15 minutes
Buys
code402 isin-check
Returns
application/json
5000units
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
AY3ZWZ…3N5uC
Token contract
EPjFWd…TDt1v
Payment window
15 minutes
Buys
code402 isin-check
Returns
application/json
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "asset_caip19": "eip155:8453/erc20:0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
    },
    "payTo": "0xc59c85e661d34084a7769f955d17fd38254a6235",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://hcrb.in/v1/tools/isin-check/call",
    "description": "code402 isin-check",
    "maxTimeoutSeconds": 900
  },
  {
    "asset": "0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42",
    "extra": {
      "name": "EURC",
      "version": "2",
      "asset_caip19": "eip155:8453/erc20:0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42"
    },
    "payTo": "0xc59c85e661d34084a7769f955d17fd38254a6235",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://hcrb.in/v1/tools/isin-check/call",
    "description": "code402 isin-check",
    "maxTimeoutSeconds": 900
  },
  {
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "asset_caip19": "eip155:137/erc20:0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359"
    },
    "payTo": "0xc59c85e661d34084a7769f955d17fd38254a6235",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:137",
    "mimeType": "application/json",
    "resource": "https://hcrb.in/v1/tools/isin-check/call",
    "description": "code402 isin-check",
    "maxTimeoutSeconds": 900
  },
  {
    "asset": "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "asset_caip19": "eip155:43114/erc20:0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E"
    },
    "payTo": "0xc59c85e661d34084a7769f955d17fd38254a6235",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:43114",
    "mimeType": "application/json",
    "resource": "https://hcrb.in/v1/tools/isin-check/call",
    "description": "code402 isin-check",
    "maxTimeoutSeconds": 900
  },
  {
    "asset": "0xC891EB4cbdEFf6e073e859e987815Ed1505c2ACD",
    "extra": {
      "name": "Euro Coin",
      "version": "2",
      "asset_caip19": "eip155:43114/erc20:0xC891EB4cbdEFf6e073e859e987815Ed1505c2ACD"
    },
    "payTo": "0xc59c85e661d34084a7769f955d17fd38254a6235",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:43114",
    "mimeType": "application/json",
    "resource": "https://hcrb.in/v1/tools/isin-check/call",
    "description": "code402 isin-check",
    "maxTimeoutSeconds": 900
  },
  {
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "asset_caip19": "eip155:42161/erc20:0xaf88d065e77c8cC2239327C5EDb3A432268e5831"
    },
    "payTo": "0xc59c85e661d34084a7769f955d17fd38254a6235",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:42161",
    "mimeType": "application/json",
    "resource": "https://hcrb.in/v1/tools/isin-check/call",
    "description": "code402 isin-check",
    "maxTimeoutSeconds": 900
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "name": "USD Coin",
      "version": "1",
      "asset_caip19": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp/spl-token:EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v"
    },
    "payTo": "AY3ZWZ5rEJ2RgMorWguxZ86jjbCxuVgvkoB8ThT3N5uC",
    "amount": "5000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "mimeType": "application/json",
    "resource": "https://hcrb.in/v1/tools/isin-check/call",
    "description": "code402 isin-check",
    "maxTimeoutSeconds": 900
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "input": {
            "isin": "US0378331005"
          }
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "valid": true,
          "reason": "checksum valid"
        }
      }
    },
    "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": [
                "input"
              ],
              "properties": {
                "input": {
                  "type": "object",
                  "required": [
                    "isin"
                  ],
                  "properties": {
                    "isin": {
                      "type": "string",
                      "description": "12-character ISIN: 2-letter country code + 9 alphanumerics + check digit; spaces allowed."
                    }
                  }
                }
              },
              "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": [
                "valid",
                "reason"
              ],
              "properties": {
                "tool": {
                  "type": "string"
                },
                "scope": {
                  "type": "string"
                },
                "valid": {
                  "type": "boolean"
                },
                "reason": {
                  "type": "string"
                },
                "country": {
                  "type": "string"
                },
                "normalized": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-26 14:14Z
Last indexed by Roundhouse
2026-10-26 20:30Z
Last enriched (probe, favicon, geo)
—
x402 version
2
Max timeout
900s
Liveness probe
Not probed
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

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. 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 hcrb.in 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=hcrb.in'
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://hcrb.in/v1/tools/isin-check/call, 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.