Tool detail

sendcheck

Checks one EVM address before you send funds: EIP-55 checksum, wallet vs contract, activity and balances, with a verdict.

Categories: Crypto risk, Onchain data

Use when

verify an address is safe to send crypto to
check if an EVM address is a contract before sending funds
confirm an address's checksum and balance before a transfer
get a go/caution/danger verdict on a wallet address

Not for

not a multi-chain deep scan - separate $0.05 /deep route covers all 5 chains
not a free checksum-only pre-check - that's the separate GET /validate route

Inputs

POST JSON body: address (string, required, 0x + 40 hex); chain (enum base|ethereum|arbitrum|optimism|polygon, optional, default base)

Admitted input schema

{
  "type": "object",
  "properties": {
    "address": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "EVM address to verify, 0x + 40 hex characters. Free format pre-check: GET /validate?address=…"
    },
    "chain": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "enum": [
        "base",
        "ethereum",
        "arbitrum",
        "optimism",
        "polygon"
      ],
      "description": "Chain to scan (default: base)"
    }
  },
  "required": [
    "address"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://sendcheck-x402.pennyforgeorg.workers.dev/check

Payment

Protocol: x402
Listed price: 0.01 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://sendcheck-x402.pennyforgeorg.workers.dev/check
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z