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Delx EVM Calldata Word Count
x402
Delx EVM Calldata Word Count 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).
Counts the 32-byte words in EVM calldata and validates its structure, returning byte count, complete word count, and partial-word bytes.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Calldata Word Count: EVM Calldata Word Count counts complete and partial 32-byte calldata words after the selector from bounded caller-supplied values without an external provider. Call EVM Calldata Word Count 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 Word Count as versioned deterministic JSON. P…
Output
A JSON object containing the input calldata, its total byte count, whether the shape is valid (true if byte count is a multiple of 32 plus a 4-byte selector), the number of complete 32-byte words, the number of partial word bytes remaining, plus an evidence block with a SHA-256 hash of the input, a flag confirming no data was retained, and the count of external calls made (always 0).
Example use cases
Pre-flight calldata word check
“Before I submit this transaction, count the 32-byte words in my calldata — here it is: 0xa9059cbb0000000000000000000000001111111111111111111111111111111111111111 — and tell me if it's valid.”
Gas estimation calldata inspection
“I'm trying to estimate gas for a contract call. Can you analyze this calldata hex and tell me the byte count, word count, and whether it's properly aligned: 0x23b872dd000000000000000000000000abc123?”
Calldata alignment validation in agent pipeline
“My agent is building EVM transactions dynamically. Check whether this calldata is word-aligned and give me the complete word count and any partial byte remainder: 0x70a08231000000000000000000000000user_address_here.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-calldata-word-countWhen to prefer
Use this endpoint when you need a fast, privacy-preserving (no retention, no external calls) preflight check on EVM calldata before submitting a transaction — particularly to confirm word alignment, byte count, and structural validity. Prefer this over manual calculation when building agent-driven EVM transaction pipelines that need auditable evidence (SHA-256 of input) of the computation.
Side effects
- Calldata string exceeds 8192 character maximum — request rejected
- Malformed or non-hex calldata string — validation error returned
- Empty calldata — may return zero counts with shape_valid false
- Payment not included or insufficient — x402 payment required error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| calldata | string | Calldata supplied to EVM Calldata Word Count; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"calldata": "0xa9059cbb0000000000000000000000001111111111111111111111111111111111111111",
"byte_count": 36,
"shape_valid": true,
"complete_words": 1,
"partial_word_bytes": 0
},
"schema": "delx/util-evm-calldata-word-count/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "1048e8d74a53c6ea3249086735deac2cb24ee3dd131a3852df0439253301d8de",
"external_calls": 0
},
"operation": "evm_preflight:evm_calldata_word_count"
}
}Tags
x402
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