{
  "format": "delx/intent-card/v1",
  "id": "evm-nonce-gap-check-api",
  "intent": "EVM Nonce Gap Check for an agent workflow",
  "title": "EVM Nonce Gap Check API for agents",
  "description": "EVM Nonce Gap Check: EVM Nonce Gap Check calculates the gap between pending and proposed transaction nonces from bounded caller-supplied values without an external provider. Call EVM Nonce Gap 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 Nonce Gap Check as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memory-only execution with no paid upstream, live RPC, web search, credentials, custody, signing, media generator, or input retention. Honest limit: Uses caller-supplied values only; it performs no RPC call, signing, broadcasting, balance lookup, custody, trading, or live-chain claim. Advisory output only; the buyer owns authorization, payment policy, and production decisions.",
  "keywords": [
    "EVM Nonce Gap Check API",
    "EVM Nonce Gap Check for agents",
    "pay per result API",
    "x402 API",
    "no API key"
  ],
  "updated_at": "2026-08-23",
  "canonical_url": "https://commerce.delx.ai/intents/evm-nonce-gap-check-api",
  "machine_url": "https://commerce.delx.ai/intents/evm-nonce-gap-check-api.json",
  "recommendation": {
    "tool_name": "util_evm_nonce_gap_check",
    "service_name": "EVM Nonce Gap Check",
    "method": "POST",
    "resource": "https://api.delx.ai/api/v1/x402/evm-nonce-gap-check",
    "price_usdc": "0.001",
    "payment_protocols": [
      "x402",
      "mpp"
    ],
    "input_schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "pending_nonce": {
          "type": "integer",
          "description": "Pending Nonce supplied to EVM Nonce Gap Check; used only for this bounded calculation and processed in memory without retention."
        },
        "proposed_nonce": {
          "type": "integer",
          "description": "Proposed Nonce supplied to EVM Nonce Gap Check; used only for this bounded calculation and processed in memory without retention."
        },
        "maximum_gap": {
          "type": "integer",
          "description": "Maximum Gap supplied to EVM Nonce Gap Check; used only for this bounded calculation and processed in memory without retention."
        }
      },
      "required": [
        "pending_nonce",
        "proposed_nonce",
        "maximum_gap"
      ],
      "additionalProperties": false
    },
    "example_input": {
      "pending_nonce": 12,
      "proposed_nonce": 14,
      "maximum_gap": 1
    },
    "example_output": {
      "schema": "delx/util-evm-nonce-gap-check/v1",
      "operation": "evm_preflight:evm_nonce_gap_check",
      "status": "advisory",
      "result": {
        "gap": 2,
        "within_budget": false,
        "possible_replacement": false
      },
      "evidence": {
        "input_sha256": "b9889d09b1009c8b22542a020475a3b907ede762b24f2fafec69d286c024edfd",
        "retained": false,
        "external_calls": 0
      }
    },
    "agentcash": {
      "buy": "npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/evm-nonce-gap-check -m POST -H 'x-delx-source: intent-card-evm-nonce-gap-check-api' --max-amount 0.001 -b '{\"pending_nonce\":12,\"proposed_nonce\":14,\"maximum_gap\":1}'",
      "max_amount_usdc": "0.001"
    }
  },
  "attribution": {
    "header": "x-delx-source",
    "value": "intent-card-evm-nonce-gap-check-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-nonce-gap-check"
  }
}