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Delx EVM Calldata Size Bytes
x402
Delx EVM Calldata Size Bytes is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Computes the byte length of EVM calldata hex strings for preflight validation before on-chain submission.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Calldata Size Bytes: EVM Calldata Size Bytes calculates calldata byte length from normalized hex from bounded caller-supplied values without an external provider. Call EVM Calldata Size Bytes before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Calldata Size Bytes as versioned deterministic JSON. Price: $0.001 USDC…
Output
Returns a JSON object containing the original calldata string, its byte_count as an integer, a shape_valid boolean indicating whether the calldata is well-formed, the operation name, status ('pass'), and evidence metadata including whether input was retained (always false), the SHA256 hash of the input, and the number of external calls made (always 0).
Example use cases
Gas estimation preflight check
“Before I broadcast this transaction, can you tell me the byte size of this calldata: 0xa9059cbb000000000000000000000000abcdef1234567890abcdef1234567890abcdef12000000000000000000000000000000000000000000000000000000000000000a — I need to know if it's within limits.”
Smart contract calldata validation
“I'm encoding a function call for my smart contract and got this calldata: 0x23b872dd — can you measure how many bytes that is and confirm the shape is valid?”
Batch transaction size auditing
“I have this calldata I generated for an EVM transaction: 0x095ea7b3000000000000000000000000deadbeef — compute its byte length so I can decide if I'm under the block gas ceiling.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-calldata-size-bytesWhen to prefer
Use this endpoint when you need a fast, verifiable, privacy-preserving byte-size check on EVM calldata before submitting or estimating gas for a transaction. It's ideal for agent preflight pipelines where you need an auditable SHA256 receipt confirming no data was retained. Prefer it over manual hex parsing when you want a structured validity flag alongside the count.
Side effects
- Malformed hex string (not 0x-prefixed or invalid hex characters) may return shape_valid: false
- Input exceeding 8192 character maxLength will be rejected
- Empty calldata string may return a zero byte count or validation error
- Non-string calldata input will fail schema validation
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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