Run Email authentication posture.

API Acre verifies the exact x402 price, Base network, recipient, and request before any wallet opens. One successful call costs $0.005 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 · Run one call

Network
Recipient
USDC contract

No ETH gas needed. Connecting does not sign or pay. Coinbase Wallet supports desktop QR and mobile handoff without a browser extension. This EIP-3009 payment needs only the displayed USDC on Base—not ETH for gas—because the facilitator submits settlement. Reject any later prompt that differs from the verified amount or recipient.

Official Coinbase agent path

Copy an exact-cap Agentic Wallet command

Running this command may automatically spend up to $0.005 USDC after Coinbase Agentic Wallet authentication and policy checks; copying it does nothing. npx --yes approves package installation. Use a separate low-value wallet and review the verified request before running it.

Review Coinbase docs

Review Coinbase command

npx --yes awal@latest x402 pay https://apiacre.com/v1/web/email-auth \
  -X POST \
  -d '{"domain":"apiacre.com","dkim_selectors":["protonmail"]}' \
  --max-amount 5000 \
  --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/web/email-auth
npx --yes agentcash@latest fetch https://apiacre.com/v1/web/email-auth \
  --method POST \
  --header 'content-type: application/json' \
  --body '{"domain":"apiacre.com","dkim_selectors":["protonmail"]}' \
  --payment-protocol x402 \
  --payment-network base \
  --max-amount 0.005

See the result before connecting · Curated static example

Email authentication posture 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": "web.email-auth",
  "version": "1",
  "data": {
    "domain": "apiacre.com",
    "mailRouting": {
      "mode": "explicit_mx",
      "mxRecords": [
        "10 mail.protonmail.ch.",
        "20 mailsec.protonmail.ch."
      ],
      "nullMx": false,
      "addressFallbackObserved": true
    },
    "spf": {
      "configured": true,
      "recordCount": 1,
      "records": [
        "v=spf1 include:_spf.protonmail.ch ~all"
      ],
      "multipleRecords": false,
      "allQualifier": "softfail",
      "directDnsMechanismCount": 1
    },
    "dmarc": {
      "configured": true,
      "recordCount": 1,
      "records": [
        "v=DMARC1; p=quarantine"
      ],
      "multipleRecords": false,
      "policy": "quarantine",
      "subdomainPolicy": null,
      "percentage": null,
      "aggregateReportingConfigured": false,
      "forensicReportingConfigured": false,
      "dkimAlignment": null,
      "spfAlignment": null
    },
    "dkim": {
      "checked": true,
      "checkedSelectors": [
        "protonmail"
      ],
      "selectors": [
        {
          "selector": "protonmail",
          "configured": true,
          "recordCount": 1,
          "multipleRecords": false,
          "revoked": false,
          "keyType": "rsa",
          "publicKeySha256": "cc2f27246460f945974ac7bf0282287809d7f7c76757b4cdad5590fa38a80f69"
        }
      ],
      "reason": null
    },
    "optionalPolicies": {
      "mtaSts": {
        "configured": false,
        "recordCount": 0,
        "records": []
      },
      "tlsReporting": {
        "configured": false,
        "recordCount": 0,
        "records": []
      },
      "bimi": {
        "configured": false,
        "recordCount": 0,
        "records": []
      }
    },
    "posture": {
      "status": "enforcing",
      "basis": "published DNS records only"
    },
    "findings": [],
    "provenance": {
      "source": "recursive DNS",
      "queries": [
        "apiacre.com A",
        "apiacre.com AAAA",
        "apiacre.com MX",
        "apiacre.com TXT",
        "_dmarc.apiacre.com TXT",
        "protonmail._domainkey.apiacre.com TXT",
        "_mta-sts.apiacre.com TXT",
        "_smtp._tls.apiacre.com TXT",
        "default._bimi.apiacre.com TXT"
      ],
      "queryCount": 9
    },
    "limitations": [
      "DNS answers are a time-specific recursive-resolver snapshot and may be cached.",
      "DKIM is checked only for selectors explicitly supplied by the caller.",
      "Published records do not prove delivery, domain ownership, sender identity, or message authenticity."
    ],
    "checkedAt": "2026-08-12T18:03:16+00:00",
    "collectionMs": 19
  },
  "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.