Index onlineMerchant portal
Api Endpoint

sendcheck

SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST {address, chain}

Open interactive test console

Offering

Provider
sendcheck-x402.pennyforge.workers.dev
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Blockchain And Crypto
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://sendcheck-x402.pennyforge.workers.dev/check
MIME type
Not provided
First seen
2026-10-16T01:50:10.647Z
Last seen
Tags
EVM, Crypto, Security, USDC, address-verification

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D"
  }
]

Observed health

Status
Healthy
Latest latency
60 ms
Average latency
266 ms
HTTP status
204
Last checked
Reachability
100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "additionalProperties": false,
  "properties": {
    "body": {
      "properties": {
        "address": {
          "description": "EVM address to verify, 0x + 40 hex characters. Free format pre-check: GET /validate?address=…",
          "type": "string"
        },
        "chain": {
          "description": "Chain to scan (default: base)",
          "enum": [
            "base",
            "ethereum",
            "arbitrum",
            "optimism",
            "polygon"
          ],
          "type": "string"
        }
      },
      "required": [
        "address"
      ],
      "type": "object"
    },
    "bodyType": {
      "enum": [
        "json"
      ],
      "type": "string"
    },
    "method": {
      "enum": [
        "POST"
      ],
      "type": "string"
    },
    "type": {
      "const": "http",
      "type": "string"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "type": "object"
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "properties": {
            "address": {
              "description": "EVM address to verify, 0x + 40 hex characters. Free format pre-check: GET /validate?address=…",
              "type": "string"
            },
            "chain": {
              "description": "Chain to scan (default: base)",
              "enum": [
                "base",
                "ethereum",
                "arbitrum",
                "optimism",
                "polygon"
              ],
              "type": "string"
            }
          },
          "required": [
            "address"
          ],
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}