{
  "format": "delx/intent-card/v1",
  "id": "evm-next-base-fee-bound-api",
  "intent": "EVM Next Base Fee Bound for an agent workflow",
  "title": "EVM Next Base Fee Bound API for agents",
  "description": "EVM Next Base Fee Bound: EVM Next Base Fee Bound calculates upper and lower next-block base-fee bounds from bounded caller-supplied values without an external provider. Call EVM Next Base Fee Bound 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 Next Base Fee Bound as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memory-only execution with no paid upstream, live RPC, web search, credentials, custody, signing, media generator, or input retention. Honest limit: Uses caller-supplied values only; it performs no RPC call, signing, broadcasting, balance lookup, custody, trading, or live-chain claim. Advisory output only; the buyer owns authorization, payment policy, and production decisions.",
  "keywords": [
    "EVM Next Base Fee Bound API",
    "EVM Next Base Fee Bound for agents",
    "pay per result API",
    "x402 API",
    "no API key"
  ],
  "updated_at": "2026-08-23",
  "canonical_url": "https://commerce.delx.ai/intents/evm-next-base-fee-bound-api",
  "machine_url": "https://commerce.delx.ai/intents/evm-next-base-fee-bound-api.json",
  "recommendation": {
    "tool_name": "util_evm_next_base_fee_bound",
    "service_name": "EVM Next Base Fee Bound",
    "method": "POST",
    "resource": "https://api.delx.ai/api/v1/x402/evm-next-base-fee-bound",
    "price_usdc": "0.001",
    "payment_protocols": [
      "x402",
      "mpp"
    ],
    "input_schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "type": "object",
      "properties": {
        "current_base_fee_wei": {
          "type": "string",
          "maxLength": 8192,
          "description": "Current Base Fee Wei supplied to EVM Next Base Fee Bound; used only for this bounded calculation and processed in memory without retention."
        },
        "maximum_change_fraction": {
          "type": "number",
          "description": "Maximum Change Fraction supplied to EVM Next Base Fee Bound; used only for this bounded calculation and processed in memory without retention."
        }
      },
      "required": [
        "current_base_fee_wei",
        "maximum_change_fraction"
      ],
      "additionalProperties": false
    },
    "example_input": {
      "current_base_fee_wei": "1000000000",
      "maximum_change_fraction": 0.125
    },
    "example_output": {
      "schema": "delx/util-evm-next-base-fee-bound/v1",
      "operation": "evm_preflight:evm_next_base_fee_bound",
      "status": "pass",
      "result": {
        "lower_wei": "875000000",
        "upper_wei": "1125000000"
      },
      "evidence": {
        "input_sha256": "bd788e10cae66dfcf807641601d7bf74d3bd4f11c95ecfe6477c865c191f130f",
        "retained": false,
        "external_calls": 0
      }
    },
    "agentcash": {
      "buy": "npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/evm-next-base-fee-bound -m POST -H 'x-delx-source: intent-card-evm-next-base-fee-bound-api' --max-amount 0.001 -b '{\"current_base_fee_wei\":\"1000000000\",\"maximum_change_fraction\":0.125}'",
      "max_amount_usdc": "0.001"
    }
  },
  "attribution": {
    "header": "x-delx-source",
    "value": "intent-card-evm-next-base-fee-bound-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-next-base-fee-bound"
  }
}