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Delx Commerce — EVM Signature V Classifier
x402
Delx Commerce — EVM Signature V Classifier 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).
Classifies an EVM transaction signature's V value as legacy, EIP-155, or other type given a chain ID, enabling preflight validation of Ethereum signature recovery parameters.
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 V value, its classification (e.g. 'legacy', 'EIP-155'), the expected chain ID derived from V, operation label, pass/fail status, and a cryptographic evidence record including input SHA-256 hash, a flag confirming no data retention, and external call count — enabling verifiable, auditable classification.
Example use cases
Pre-submission signature validation on Base
“Before I relay this Ethereum transaction on Base (chain ID 8453), can you classify the signature V value of 37 to check whether it's EIP-155 compliant or legacy?”
Debugging unexpected signature recovery
“I'm getting signature recovery errors on chain 1 — can you classify V value 28 for chain ID 1 and tell me what type it should be and what chain ID is expected?”
Automated preflight in transaction pipeline
“As part of my transaction signing pipeline, classify V value 0 against chain ID 137 so I know whether to treat this as a legacy or EIP-155 signature before broadcasting.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/evm-signature-v-classify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, verifiable, pay-per-use classification of an EVM signature V value without signing up for an account. Ideal for AI agents doing preflight checks before broadcasting EVM transactions, especially when auditability matters — the response includes a SHA-256 evidence hash confirming no data retention. At $0.001 USDC per call it suits high-frequency pipelines.
Side effects
- Invalid or missing V value — returns validation error
- Invalid or missing chain_id — returns validation error
- V value outside supported EVM ranges — may return unclassified result
- Network or payment failure via x402 protocol — request not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| v | integer | V supplied to EVM Signature V Classify; used only for this bounded calculation and processed in memory without retention. |
| chain_id | integer | Chain Id supplied to EVM Signature V Classify; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"v": 27,
"classification": "legacy",
"expected_chain_id": 8453
},
"schema": "delx/util-evm-signature-v-classify/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "7717f04f6d982d96f99fcfa69caef99e8c3090309ae581ae53da0c8612700635",
"external_calls": 0
},
"operation": "evm_preflight:evm_signature_v_classify"
}
}Tags
x402
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