{ try it }

"skills": 21, // pay-per-call, no account, no API key

"protocol": "x402 v2 · scheme exact",

"network": "eip155:8453", // Base mainnet

"this_page_pays": false // "Send unpaid request" only shows the 402 challenge. Paying stays with your own wallet or agent.

"your_wallet": optional · prompt only

← all 21 skills

"sha256": { SHA-256 Hash $0.003 featured Hash a string with SHA-256 and return hex plus a short prefix. Deterministic, no network.

"endpoint": "https://grokzilla.shop/api/skills/sha256",

"method": "POST", "content_type": "application/json",

"price_usd": 0.003, // 3000 atomic USDC (6 decimals)

"network": "eip155:8453", // Base mainnet

"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", // USDC

"payTo": "0xc22f9CAEBAc37fE72D5142f35f21f6696Ea9Ef69",

"docs": "/docs/sha256",

"you_provide": { // JSON body fields

"text": required string

"encoding": optional string

"request_body": // live, from your inputs

{
  "text": "hello",
  "encoding": "utf-8"
}

"you_get": { // HTTP 200 application/json after payment

"output_schema":

{
  "type": "object",
  "properties": {
    "skill": {
      "type": "string"
    },
    "ok": {
      "type": "boolean"
    },
    "algo": {
      "type": "string"
    },
    "bytes": {
      "type": "integer"
    },
    "hex": {
      "type": "string"
    },
    "hex_prefix": {
      "type": "string"
    }
  },
  "required": [
    "ok",
    "skill"
  ]
}

"example":

{
  "skill": "sha256",
  "ok": true,
  "algo": "sha256",
  "bytes": 5,
  "hex": "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824",
  "hex_prefix": "2cf24dba5fb0a30e"
}

"flow": [

POST https://grokzilla.shop/api/skills/sha256 with the JSON body, no payment header
← 402 Payment Required + PAYMENT-REQUIRED header: base64 JSON {x402Version: 2, accepts: [{scheme: "exact", network: "eip155:8453", asset: USDC, amount: "3000", payTo}]} (same JSON in the body)
your x402 client checks amount ≤ $0.003 and signs a USDC transfer authorization to payTo with your wallet
retry the same POST with PAYMENT-SIGNATURE: <base64> (x402 v2) or X-PAYMENT (v1 clients)
← 200 OK with the result JSON + PAYMENT-RESPONSE header (base64 settlement receipt, tx hash on Base)

"copy": { // fills in from your inputs as you type

"agent_prompt"

"curl" // unpaid: shows the 402

"agentcash" // pays from your AgentCash wallet

"try": // POSTs unpaid to /api/skills/sha256 on this host and decodes the 402. Never pays.

}