hcrb.in

Name: hcrb.in
Price: 0.005 USDC
Availability: InStock

Outbound transaction count (nonce) and contract-or-EOA check for an address on Base. Result carries a signed receipt.

OtherLiveeip155:8453Exactvia cdp

https://hcrb.in/v1/tools/tx-activity/call

Calls · 30d

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 16 snapshots so far.

$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.

Calls · 30d

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

Unique payers · 30d

Last called 2026-10-25 18:44Z

—

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.

Live 402 challenge

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

{
  "mcp": "https://hcrb.in/mcp",
  "call": "/v1/tools/tx-activity/call",
  "code": "X402_PAYMENT_REQUIRED",
  "docs": "https://hcrb.in/openapi.json",
  "tool": "tx-activity",
  "title": "Tx Activity & Contract Detection",
  "method": "POST",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "tier": "economy",
        "version": "2",
        "currency": "USDC",
        "multiplier": 1,
        "asset_caip19": "eip155:8453/erc20:0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "payTo_caip10": "eip155:8453:0xc59c85e661d34084a7769f955d17fd38254a6235"
      },
      "payTo": "0xc59c85e661d34084a7769f955d17fd38254a6235",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://hcrb.in/v1/tools/tx-activity/call",
      "description": "code402 tx-activity (standard floor — 1.0x reserve floor)",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42",
      "extra": {
        "name": "EURC",
        "tier": "economy",
        "version": "2",
        "currency": "EURC",
        "multiplier": 1,
        "asset_caip19": "eip155:8453/erc20:0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42",
        "payTo_caip10": "eip155:8453:0xc59c85e661d34084a7769f955d17fd38254a6235"
      },
      "payTo": "0xc59c85e661d34084a7769f955d17fd38254a6235",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://hcrb.in/v1/tools/tx-activity/call",
      "description": "code402 tx-activity (EURC — standard floor)",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://hcrb.in/v1/tools/tx-activity/call",
    "mimeType": "application/json",
    "description": "Outbound transaction count (nonce) and contract-or-EOA check for an address on Base. Result carries a signed receipt."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "input": {
              "address": "0xc59c85e661d34084a7769f955d17fd38254a6235"
            }
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "valid": true,
            "address": "0x0000000000000000000000000000000000000000",
            "tx_count": 0,
            "is_contract": false,
            "first_funded_heuristic": 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": [
                  "input"
                ],
                "properties": {
                  "input": {
                    "type": "object",
                    "required": [
                      "address"
                    ],
                    "properties": {
                      "address": {
                        "type": "string",
                        "description": "EVM address, 0x-prefixed."
                      }
                    }
                  }
                },
                "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",
                  "address",
                  "tx_count"
                ],
                "properties": {
                  "tool": {
                    "type": "string"
                  },
                  "scope": {
                    "type": "string"
                  },
                  "valid": {
                    "type": "boolean"
                  },
                  "address": {
                    "type": "string"
                  },
                  "tx_count": {
                    "type": "number"
                  },
                  "is_contract": {
                    "type": "boolean"
                  },
                  "first_funded_heuristic": {
                    "type": "boolean"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "price_note": "The published floor is not a fixed quote for every tool. Gas guards may raise the price; use this response's accepts amount before authorizing payment. Each accepted voucher settles as its own transfer.",
  "description": "Outbound transaction count (nonce) and contract-or-EOA check for an address on Base. Result carries a signed receipt.",
  "x402Version": 2,
  "input_schema": {
    "type": "object",
    "required": [
      "address"
    ],
    "properties": {
      "address": {
        "type": "string",
        "description": "EVM address, 0x-prefixed."
      }
    }
  },
  "output_schema": {
    "type": "object",
    "required": [
      "valid",
      "address",
      "tx_count"
    ],
    "properties": {
      "tool": {
        "type": "string"
      },
      "scope": {
        "type": "string"
      },
      "valid": {
        "type": "boolean"
      },
      "address": {
        "type": "string"
      },
      "tx_count": {
        "type": "number"
      },
      "is_contract": {
        "type": "boolean"
      },
      "first_funded_heuristic": {
        "type": "boolean"
      }
    }
  },
  "operator_offer": {
    "tier": "audit-gate-pilot",
    "pilot": "https://hcrb.in/pilot",
    "verify": "https://hcrb.in/verify",
    "contact_discovery": "https://hcrb.in/.well-known/operator-contact",
    "request_pilot_api": "https://hcrb.in/v1/pilot/request"
  },
  "example_request": {
    "input": {
      "address": "0xc59c85e661d34084a7769f955d17fd38254a6235"
    }
  },
  "price_usdc_floor": 0.005
}

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 tx-activity
Returns: application/json

5000units

on Base · exact scheme