# Delx Commerce — EVM Signature V Classifier

> 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.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/evm-signature-v-classify?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-evm-signature-v-classifier-a100d5a1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EqJo_69jElFNXfAirHqJx

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability delx-commerce-evm-signature-v-classifier-a100d5a1 -d '<json body>'
```

Example prompt: Can you classify this EVM signature V value of 27 for chain ID 8453 — I need to know if it's legacy or EIP-155 before I process this transaction?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "v": {
   "type": "integer",
   "description": "V supplied to EVM Signature V Classify; used only for this bounded calculation and processed in memory without retention."
  },
  "chain_id": {
   "type": "integer",
   "description": "Chain Id supplied to EVM Signature V Classify; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-evm-signature-v-classifier-a100d5a1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)