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Delx Commerce — EVM Log Topic Count Check
x402
Delx Commerce — EVM Log Topic Count Check 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).
Validates that a list of EVM log topics does not exceed a specified maximum count, returning the topic count and a pass/fail result.
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 the original topics array, the counted number of topics, a boolean indicating whether the count is within the specified maximum, a pass/fail status string, and verifiable evidence including a SHA256 hash of the input and a flag confirming no data was retained or external calls made.
Example use cases
Pre-submission log filter validation
“Before I call eth_getLogs, verify that my 3 topics ["0xddf252ad...", "0x000...abc", "0x000...def"] don't exceed the maximum of 4 allowed topics.”
Smart contract event preflight check
“I'm building an EVM event listener — can you confirm that this topics array with 5 entries exceeds the maximum of 4 and would fail the topic count check?”
Automated agent transaction preflight
“As part of my on-chain workflow, check whether the topics ["0xabc...", "0x123..."] are within the limit of 2 topics so I know if it's safe to proceed with the transaction.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/evm-log-topic-count-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a cheap, verifiable, stateless preflight check on EVM log topic counts before executing on-chain queries or transactions. It is ideal for AI agents performing blockchain workflow automation that require tamper-evident, auditable validation evidence (SHA256 input hash, no retention, zero external calls). Prefer it over custom logic when you need cryptographic proof of the check and pay-per-result pricing without signup.
Side effects
- Topics array exceeds 256 items — request rejected
- Individual topic string exceeds 8192 characters — request rejected
- Missing or malformed maximum integer — validation cannot proceed
- Payment failure via x402 protocol — call not executed
- Malformed JSON body — 400 error returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| topics | array | Topics supplied to EVM Log Topic Count Check; used only for this bounded calculation and processed in memory without retention. |
| maximum | integer | Maximum supplied to EVM Log Topic Count Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"topics": [
"0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
],
"topic_count": 1,
"within_limit": true
},
"schema": "delx/util-evm-log-topic-count-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "94bb14a112913b6e521fe6f4d7a71088495e0a7177ac1eb18e1ff94e7d02627e",
"external_calls": 0
},
"operation": "evm_preflight:evm_log_topic_count_check"
}
}Tags
x402
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