RLP-encode hex byte structures API

RLP-encode a 0x-hex byte string or an arbitrarily nested array of them (the encoding EVM uses for txs, account state, and proofs), via viem's toRlp. Answers 'What is the RLP of [0x01,0x02]?','How do I encode this list for an EVM tx?'.

Price$0.01per request

MethodPOST

Route/v1/evm/rlp-encode

StatusLive

MIME typeapplication/json

Rate limit60/minute

CacheNo cache

evmrlpencodeserializebytestransactionhex

API URLhttps://x402.hexl.dev/v1/evm/rlp-encode

Integration docs

Example request

{
  "data": [
    "0x01",
    "0x02",
    "0x03"
  ]
}

Example response

{
  "input": [
    "0x01",
    "0x02",
    "0x03"
  ],
  "encoded": "0xc3010203"
}

Input schema

{
  "type": "object",
  "required": [
    "data"
  ],
  "properties": {
    "data": {
      "description": "A 0x-hex string or a (possibly nested) array of 0x-hex strings.",
      "examples": [
        [
          "0x01",
          "0x02",
          "0x03"
        ],
        "0xdead"
      ]
    }
  },
  "examples": [
    {
      "data": [
        "0x01",
        "0x02",
        "0x03"
      ]
    }
  ]
}

Output schema

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