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Delx Commerce — EVM Calldata Size Bytes
x402
Delx Commerce — EVM Calldata Size Bytes is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Computes the byte length of an EVM calldata hex string and validates its format, returning the byte count and shape validity.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object containing the original calldata, the computed byte count as an integer, a boolean shape_valid flag indicating whether the calldata is correctly formatted, the operation name, status ('pass'), and an evidence block with retained (false), input SHA256 hash, and external call count (0) confirming in-memory-only processing.
Example use cases
Preflight calldata size before gas estimation
“Before I submit this transaction, can you check the byte size of this calldata: '0x23b872dd000000000000000000000000ab5801a7d398351b8be11c439e05c5b3259aec9'? I need to know the byte count and whether the shape is valid.”
Validate smart contract interaction calldata
“I'm building a smart contract call and want to verify my encoded calldata '0x095ea7b3000000000000000000000000ab5801a7d398351b8be11c439e05c5b3259aec9ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff' — how many bytes is it and is the format correct?”
Debug malformed calldata hex string
“This calldata string looks off to me: '0x1234abcd'. Can you calculate its byte size and tell me if the shape is valid so I can figure out if it's properly formed?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/evm-calldata-size-bytes?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, verifiable, pay-per-use check of EVM calldata byte length and format validity without any state retention — ideal for preflight validation before submitting Ethereum transactions, gas estimation workflows, or debugging malformed calldata. Prefer this over building your own parser when auditability (via SHA256 evidence) and agent-native micropayment billing via USDC/x402 are desirable.
Side effects
- Calldata exceeding 8192 characters will be rejected
- Non-hex or malformed input strings may result in shape_valid: false rather than an error
- Missing or empty calldata field returns a validation error
- Network or payment failure via x402 protocol prevents the call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| calldata | string | Calldata supplied to EVM Calldata Size Bytes; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"calldata": "0x1234abcd",
"byte_count": 4,
"shape_valid": true
},
"schema": "delx/util-evm-calldata-size-bytes/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "6ffdb637cbb0ee3342cdd21ba540914ee72f80a467cba5a39651837c42e42662",
"external_calls": 0
},
"operation": "evm_preflight:evm_calldata_size_bytes"
}
}Tags
x402
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