Base58 / Base58Check encode-decode API

Encode or decode Base58 (Solana-style) or Base58Check (Bitcoin-style 4-byte double-SHA256 checksum) between hex and base58, implemented as pure big-integer base conversion with node:crypto. Answers 'What is the Base58Check of these bytes?','Is this base58 checksum valid?'.

Price$0.01per request

MethodPOST

Route/v1/evm/base58

StatusLive

MIME typeapplication/json

Rate limit60/minute

CacheNo cache

evmbase58base58checkbitcoinsolanaencodedecode

API URLhttps://x402.hexl.dev/v1/evm/base58

Integration docs

Example request

{
  "data": "0x0011223344",
  "direction": "encode",
  "check": true
}

Example response

{
  "direction": "encode",
  "check": true,
  "hex": "0x0011223344",
  "base58": "13sDc6zobSZg",
  "checksumValid": true
}

Input schema

{
  "type": "object",
  "required": [
    "data",
    "direction"
  ],
  "properties": {
    "data": {
      "type": "string",
      "description": "Hex (for encode) or base58 string (for decode).",
      "examples": [
        "0x0011223344",
        "13sDc6zobSZg"
      ]
    },
    "direction": {
      "type": "string",
      "enum": [
        "encode",
        "decode"
      ]
    },
    "check": {
      "type": "boolean",
      "default": false,
      "description": "Use Base58Check (4-byte sha256d checksum)."
    }
  },
  "examples": [
    {
      "data": "0x0011223344",
      "direction": "encode",
      "check": true
    }
  ]
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}