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GET
https://wurkapi.fun
/
api
/
x402
/
base
/
jobs
/
{jobId}
/
pay
curl -X GET "https://wurkapi.fun/api/x402/base/jobs/89e57c15/pay" \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Accept: application/json"

{
  "x402Version": 1,
  "accepts": [
    {
      "scheme": "exact",
      "network": "base",
      "maxAmountRequired": "2500000",
      "resource": "https://wurkapi.fun/api/x402/base/jobs/21752134/pay",
      "description": "",
      "mimeType": "",
      "payTo": "0xF00DAF15713e82fBb7bDC4b818444D93D655DE96",
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "maxTimeoutSeconds": 60,
      "extra": {
        "chainId": 8453,
        "decimals": 6,
        "eip712": {
          "name": "USD Coin",
          "version": "2"
        },
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

​
Authentication

​
X-API-Key
string
required
Your WURK API key
​
X-PAYMENT
string
required
Payment header generated by x402 client library. Required to complete the payment (second request)

​
Path Parameters

​
jobId
string
required
The job ID (8 character identifier returned from job creation)

​
Flow

This endpoint requires two requests to complete a payment:
  1. First Request (without X-PAYMENT): Returns 402 with payment requirements
  2. Second Request (with X-PAYMENT): Processes payment and returns 200 on success
The X-PAYMENT header is required to actually process the payment. Without it, you’ll only receive the payment requirements (402 response).

​
Response

​
First Request (402)

​
x402Version
number
x402 protocol version (currently 1)
​
accepts
array
Array of payment requirement objects with fields:
  • scheme: Payment scheme ("exact")
  • network: Blockchain network ("base")
  • maxAmountRequired: Amount in smallest unit (e.g., "2500000" for 2.5 USDC)
  • resource: The payment endpoint URL
  • payTo: Recipient wallet address
  • asset: USDC contract address on Base (0x833589fcd6edb6e08f4c7c32d4f71b54bda02913)
  • maxTimeoutSeconds: Payment timeout (typically 60)
  • extra: Additional data including:
    • chainId: Base mainnet chain ID (8453)
    • decimals: USDC decimals (6)
    • eip712: EIP-712 domain parameters
    • name: Token name ("USD Coin")
    • version: EIP-712 version ("2")

​
Second Request (200)

​
ok
boolean
Always true on success
​
paid
boolean
true when payment is confirmed
​
jobId
string
The job ID that was paid
​
x-payment-response
string
Optional header containing settlement details (transaction hash, network)

​
Implementation Examples

curl -X GET "https://wurkapi.fun/api/x402/base/jobs/89e57c15/pay" \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Accept: application/json"

​
Hosted Payment UI

You can also use a hosted payment interface for wallet-based payments: 
https://echo.payai.network/?resource=<url-encoded-resource-url>
Example for a job payment: 
https://echo.payai.network/?resource=https%3A%2F%2Fwurkapi.fun%2Fapi%2Fx402%2Fbase%2Fjobs%2F<jobId>%2Fpay

{
  "x402Version": 1,
  "accepts": [
    {
      "scheme": "exact",
      "network": "base",
      "maxAmountRequired": "2500000",
      "resource": "https://wurkapi.fun/api/x402/base/jobs/21752134/pay",
      "description": "",
      "mimeType": "",
      "payTo": "0xF00DAF15713e82fBb7bDC4b818444D93D655DE96",
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "maxTimeoutSeconds": 60,
      "extra": {
        "chainId": 8453,
        "decimals": 6,
        "eip712": {
          "name": "USD Coin",
          "version": "2"
        },
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

​
Common Errors

simulation_reverted: Usually means insufficient USDC balance. Ensure the payer wallet has at least the maxAmountRequired amount of USDC on Base (remember USDC has 6 decimals).
invalid_exact_evm_payload_signature: EIP-712 domain mismatch. The x402-axios interceptor handles this automatically, but if building manually, ensure you use the exact fields from accepts.extra.

​
Technical Details

​
EIP-3009 Authorization

The Base implementation uses EIP-3009 (transferWithAuthorization) for USDC transfers. The x402 library automatically:
  1. Creates an EIP-712 typed data structure
  2. Signs the authorization with your private key
  3. Encodes it in the X-PAYMENT header
  4. The facilitator verifies and executes the transfer on-chain

​
Prerequisites

  • EVM wallet with USDC on Base mainnet (chainId: 8453)
  • Sufficient USDC balance (check maxAmountRequired)
  • Optional: Base RPC endpoint for balance checks

​
Network Information

  • Chain: Base Mainnet
  • Chain ID: 8453
  • USDC Contract: 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913
  • Payment Receiver: 0xF00DAF15713e82fBb7bDC4b818444D93D655DE96