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Delx Commerce — EVM Calldata Word Count
x402
Delx Commerce — EVM Calldata Word Count is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Counts the number of 32-byte words in EVM calldata and validates its structural shape, returning byte count, complete words, and partial word bytes.
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 with the original calldata, total byte count, a boolean indicating whether the shape is valid (i.e., properly formed for EVM ABI), the number of complete 32-byte words, and the number of partial word bytes. Also includes an evidence object confirming the input was not retained, an SHA-256 hash of the input, and the number of external calls made (always 0).
Example use cases
Preflight calldata validation before transaction
“Before I broadcast this EVM transaction, check how many 32-byte ABI words are in this calldata and whether its shape is valid: 0xa9059cbb000000000000000000000000abcdef1234567890abcdef1234567890abcdef120000000000000000000000000000000000000000000000000de0b6b3a7640000”
Debugging malformed smart contract call
“I'm getting a revert on my contract call — can you count the words in this calldata and tell me if the structure looks correct? 0x23b872dd000000000000000000000000aaaa0000000000000000000000000000bbbbbbbb”
Auditing calldata encoding in agent workflow
“As part of our transaction signing pipeline, analyze this calldata and give me the byte count, complete word count, and any partial word bytes: 0x095ea7b30000000000000000000000001234567890abcdef1234567890abcdef12345678ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/evm-calldata-word-count?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, trustless, pay-per-use computation of EVM calldata word count without running a local EVM toolchain. Ideal for agent workflows doing preflight validation of transaction calldata before submission, where verifiable evidence (input hash, no retention, no external calls) is required. Prefer over running a local ABI parser when you need an auditable, micro-priced result with cryptographic evidence of computation integrity.
Side effects
- Calldata exceeding 8192 characters will be rejected
- Non-hex or malformed calldata strings may cause validation failure or shape_valid=false
- Payment failure via x402 protocol will block request
- Empty calldata input may return zero counts with shape_valid=false
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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