## CAPABILITY: pay-per-call-check-icon-x402
description: Check whether an icon you already have meets real platform rules — W3C maskable safe zone (40%/50% circle), Android adaptive 108dp layer (66dp safe / 18dp margin), or iOS square+opaque+1024px guidance. One image, one target, structured pass/warn/fail/undetermined report. Pure local pixel inspection — no AI, no account. Distinct from icons-from-image, which generates a full icon set from a source image. Paid per call via x402 — no Imagcon account or API key; payment is the authentication. Every successful call charges $0.01 USDC.
input:
  - name: image
    type: file
    required: true
    description: Icon image (PNG/JPEG/WebP), sent as multipart/form-data field "image" OR as JSON field "image_base64" (base64-encoded).
  - name: target
    type: string
    required: true
    description: Platform check — maskable, android-adaptive, or ios.
output:
  - type: json
    description: Compliance report with tri-state compliant (true/false/null), per-check outcome (pass/warn/fail/info/undetermined), and image metadata.
auth-required: false
scope: financial-transaction

### API (paid)
method: POST
endpoint: https://imagcon.app/routes/x402/check-icon
body:
  image: <<binary file via multipart/form-data, OR>>
  image_base64: <<base64-encoded image string, JSON body>>
  target: <<maskable | android-adaptive | ios>>
response:
  json: {target, compliant, checks[], image}

targets:
  maskable: Square required. Content bounding circle vs W3C 40% pass / 40-50% warn / >50% fail.
  android-adaptive: Square required. Content circle vs 30.6% pass / 30.6-33.3% warn (Android 18+66+18=102 gap) / >33.3% fail. Plus info-only adaptive density hint.
  ios: Square required. Any non-opaque pixel fails. Below 1024px warns only (never hard-fails compliant).

Payment mechanics (read before invoking): this endpoint speaks x402 v2 directly over plain HTTP. An unpaid request returns HTTP 402 with a base64-encoded PAYMENT-REQUIRED header. The accepts[] entry specifies scheme "exact", network "eip155:8453" (Base mainnet), asset USDC, amount "10000" (=$0.01, 6 decimals), and a payTo address. Sign EIP-3009 transferWithAuthorization, retry with Payment-Signature header; response is HTTP 200 with the JSON report plus Payment-Response header confirming settlement.

### PAYLOAD SHAPE (language-agnostic)
The Payment-Signature header value is base64 JSON with x402Version, payload (signature + authorization), and accepted copied verbatim from accepts[0] in the 402 response.

### EXAMPLE (Python, official x402 SDK)
Install: pip install "x402[evm]" requests eth-account

```python
import base64
from eth_account import Account
from x402 import x402ClientSync
from x402.mechanisms.evm.signers import EthAccountSigner
from x402.mechanisms.evm.exact import ExactEvmClientScheme
from x402.http.clients.requests import x402_requests

with open("icon.png", "rb") as f:
    icon_b64 = base64.b64encode(f.read()).decode()

account = Account.from_key("0xYOUR_PRIVATE_KEY")
client = x402ClientSync()
client.register("eip155:8453", ExactEvmClientScheme(EthAccountSigner(account)))
session = x402_requests(client)

resp = session.post(
    "https://imagcon.app/routes/x402/check-icon",
    json={"image_base64": icon_b64, "target": "maskable"},
)
report = resp.json()
print(report["compliant"], report["checks"])
```

### WALLET PROFILE (optional — paper plan by default)
Successful paid calls may return X-Imagcon-Token and related profile headers per the pay-per-call-icons-from-image blueprint. Send X-Imagcon-Profile: none to skip profile creation.