Run Base transaction gas estimate.

API Acre verifies the exact x402 price, Base network, recipient, and request before any wallet opens. One successful call costs $0.004 USDC.

No accountNo subscriptionNo private-key uploadOne-call authorization

API Acre never receives your private key; signing stays inside your wallet.

Loading a no-payment verification…

Verified live x402 quote

1 · Choose how to run one call

Both routes use this exact verified request and one-call price. Nothing is connected, signed, installed, or paid until you continue.

Browser or mobile

Pay with a wallet

Use an installed EVM wallet, or open Coinbase Wallet through a desktop QR code or mobile handoff.

Agent or terminal

Use Coinbase Agentic Wallet

Copy a command locked to this endpoint, request, and exact USDC cap. Copying is inert; running it may install the official CLI and pay after its authentication and policy checks.

Review Coinbase docs

Network
Recipient
USDC contract

No ETH gas needed. Connecting does not sign or pay. This EIP-3009 payment needs only the displayed USDC on Base because the facilitator submits settlement. Reject any later prompt that differs from the verified amount or recipient.

Review exact-cap Coinbase command

Running this command may automatically spend up to $0.004 USDC. npx --yes approves package installation. Use a separate low-value wallet and review the verified request first.

npx --yes awal@latest x402 pay https://apiacre.com/v1/crypto/base-gas-estimate \
  -X POST \
  -d '{"from_address":"0x1111111111111111111111111111111111111111","to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","value_wei":"0","call_data":"0x70a082310000000000000000000000001111111111111111111111111111111111111111","block_tag":"safe","buffer_percent":20}' \
  --max-amount 4000 \
  --json

Alternative third-party AgentCash command

The first command checks without paying; running fetch may pay up to the same exact cap.

Review AgentCash docs

npx --yes agentcash@latest check https://apiacre.com/v1/crypto/base-gas-estimate
npx --yes agentcash@latest fetch https://apiacre.com/v1/crypto/base-gas-estimate \
  --method POST \
  --header 'content-type: application/json' \
  --body '{"from_address":"0x1111111111111111111111111111111111111111","to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","value_wei":"0","call_data":"0x70a082310000000000000000000000001111111111111111111111111111111111111111","block_tag":"safe","buffer_percent":20}' \
  --payment-protocol x402 \
  --payment-network base \
  --max-amount 0.004

See the result before connecting · Curated static example

Base transaction gas estimate returns structured JSON. This example is static; the paid call returns a fresh result and settlement receipt.

{
  "request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a",
  "service": "crypto.base-gas-estimate",
  "version": "1",
  "data": {
    "network": "eip155:8453",
    "status": "estimated",
    "estimationAccepted": true,
    "transaction": {
      "from": "0x1111111111111111111111111111111111111111",
      "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "valueWei": "0",
      "dataBytes": 36,
      "dataSha256": "2da90680426443e99a57371fef89ebdb0cba7f941eda4e27491a3bd2069ef775",
      "selector": "0x70a08231"
    },
    "block": {
      "requestedTag": "safe",
      "number": 34567890,
      "hash": "0x1111111111111111111111111111111111111111111111111111111111111111",
      "timestamp": "2026-08-10T16:00:00+00:00",
      "gasLimit": 120000000,
      "baseFeePerGasWei": "500000"
    },
    "estimate": {
      "gas": 24640,
      "gasHex": "0x6040",
      "bufferPercent": 20,
      "suggestedGasLimit": 29568,
      "suggestedGasLimitHex": "0x7380",
      "bufferCapped": false,
      "baseFeeComponentWei": "12320000000",
      "suggestedBaseFeeComponentWei": "14784000000"
    },
    "rpcError": null,
    "networkRequestsMade": 2,
    "rpcCallsMade": 2,
    "readOnly": true,
    "transactionBroadcast": false,
    "warnings": [],
    "limitations": [
      "The estimate is state-dependent and does not guarantee later execution.",
      "Base-fee components exclude priority fees, L1 data fees, and other fee components.",
      "Only one existing destination is estimated; contract deployment is not supported."
    ],
    "source": "https://docs.base.org/base-chain/api-reference/ethereum-json-rpc-api/eth_estimateGas",
    "disclaimer": "Read-only Base mainnet gas estimation only. No transaction is created, signed, submitted, or broadcast."
  },
  "meta": {
    "duration_ms": 42,
    "cached": false,
    "sources": [],
    "warnings": [],
    "next_actions": []
  }
}

Review exact request JSON

Result

Settlement receipt

Change the request (optional)

JSON input

The default request is verified automatically. Editing it invalidates the quote and requires this no-payment verification again.

Prefer your own client? Use the official x402 SDK examples. Browser checkout requires an EVM wallet with USDC on Base; command-line buyers require their own separately configured wallet and spending policy.