{
  "format": "delx/intent-card/v1",
  "id": "evm-signature-v-classify-api",
  "intent": "EVM Signature V Classify for an agent workflow",
  "title": "EVM Signature V Classify API for agents",
  "description": "EVM Signature V Classify: EVM Signature V Classify classifies common signature recovery and EIP-155 v values from bounded caller-supplied values without an external provider. Call EVM Signature V Classify 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 Signature V Classify as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memory-only execution with no paid upstream, live RPC, web search, credentials, custody, signing, media generator, or input retention. Honest limit: Uses caller-supplied values only; it performs no RPC call, signing, broadcasting, balance lookup, custody, trading, or live-chain claim. Advisory output only; the buyer owns authorization, payment policy, and production decisions.",
  "keywords": [
    "EVM Signature V Classify API",
    "EVM Signature V Classify for agents",
    "pay per result API",
    "x402 API",
    "no API key"
  ],
  "updated_at": "2026-08-23",
  "canonical_url": "https://commerce.delx.ai/intents/evm-signature-v-classify-api",
  "machine_url": "https://commerce.delx.ai/intents/evm-signature-v-classify-api.json",
  "recommendation": {
    "tool_name": "util_evm_signature_v_classify",
    "service_name": "EVM Signature V Classify",
    "method": "POST",
    "resource": "https://api.delx.ai/api/v1/x402/evm-signature-v-classify",
    "price_usdc": "0.001",
    "payment_protocols": [
      "x402",
      "mpp"
    ],
    "input_schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "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."
        }
      },
      "required": [
        "v",
        "chain_id"
      ],
      "additionalProperties": false
    },
    "example_input": {
      "v": 27,
      "chain_id": 8453
    },
    "example_output": {
      "schema": "delx/util-evm-signature-v-classify/v1",
      "operation": "evm_preflight:evm_signature_v_classify",
      "status": "pass",
      "result": {
        "v": 27,
        "classification": "legacy",
        "expected_chain_id": 8453
      },
      "evidence": {
        "input_sha256": "7717f04f6d982d96f99fcfa69caef99e8c3090309ae581ae53da0c8612700635",
        "retained": false,
        "external_calls": 0
      }
    },
    "agentcash": {
      "buy": "npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/evm-signature-v-classify -m POST -H 'x-delx-source: intent-card-evm-signature-v-classify-api' --max-amount 0.001 -b '{\"v\":27,\"chain_id\":8453}'",
      "max_amount_usdc": "0.001"
    }
  },
  "attribution": {
    "header": "x-delx-source",
    "value": "intent-card-evm-signature-v-classify-api"
  },
  "evidence": {
    "paid_openapi": "https://api.delx.ai/openapi.x402.json",
    "governed_portfolio": "https://api.delx.ai/x402-portfolio.json",
    "live_contract": "https://api.delx.ai/api/v1/x402/evm-signature-v-classify"
  }
}