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Delx EVM Log Topic Count Check
x402
Delx EVM Log Topic Count Check 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).
Validates that the number of EVM log topics in a list does not exceed a specified maximum, returning a pass/fail result with evidence metadata.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Log Topic Count Check: EVM Log Topic Count Check checks log topic count against an expected bound from bounded caller-supplied values without an external provider. Call EVM Log Topic Count Check 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 Log Topic Count Check as versioned deterministic JSON. Price: $0.001…
Output
Returns the original topics array, the counted number of topics, a boolean indicating whether the count is within the specified maximum, an overall pass/fail status, and evidence metadata including a SHA-256 hash of the input and confirmation that no data was retained or external calls made.
Example use cases
Preflight Ethereum event log submission
“I'm about to emit a Solidity event with these 5 topics: ['0x111...','0x222...','0x333...','0x444...','0x555...']. Check if that exceeds the EVM maximum of 4 and tell me whether it'll pass validation.”
Smart contract log topic compliance check
“My indexing pipeline is building EVM log filters with up to 3 topics each. Can you verify that this batch topic list ['0xabc...','0xdef...','0x123...'] is within a maximum of 3 before I send it downstream?”
Dynamic log filter guard before RPC call
“I'm generating EVM log queries dynamically and need to make sure this topics array ['0xfoo...','0xbar...'] won't exceed a ceiling of 4 — run the topic count check and confirm it's safe to proceed.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-log-topic-count-checkWhen to prefer
Use this endpoint when building EVM transaction or log-filter pipelines where you need a lightweight, auditable preflight check to confirm topic arrays stay within protocol or application-defined ceilings before broadcasting or indexing. Prefer it over custom code when you need an evidence trail (SHA-256 hash, retained:false attestation) for compliance or debugging purposes.
Side effects
- Topics array exceeds 256 items — request rejected
- Maximum not provided — validation may behave unexpectedly
- Malformed topic strings longer than 8192 characters — schema validation error
- Invalid JSON body — 400 error
- Network timeout — no result 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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