curl -i 'https://api.dgrid.ai/x402/v1/responses' \
  -H 'Content-Type: application/json' \
  --data-raw '{
    "model": "anthropic/claude-opus-4.5",
    "stream": true,
    "messages": [
      { "role": "user", "content": "Hello" }
    ]
  }'

curl -i 'https://api.dgrid.ai/x402/v1' \
  -H 'Content-Type: application/json' \
  -H 'x-payment: <x402-payment-payload>' \
  --data-raw '{
    "model": "anthropic/claude-opus-4.5",
    "stream": true,
    "messages": [
      { "role": "user", "content": "Hello" }
    ]
  }'

HTTP/1.1 402 Payment Required
Content-Type: application/json
X-PAYMENT-RESPONSE: <base64>

{
  "x402Version": 1,
  "error": "Payment required",
  "accepts": [
    {
      "scheme": "upto",
      "network": "eip155:56",
      "maxAmountRequired": "990000000000000000",
      "resource": "https://api.dgrid.ai/x402/v1",
      "payTo": "0x...",
      "asset": "0x8d0D000Ee44948FC98c9B98A4FA4921476f08B0d",
      "maxTimeoutSeconds": 86400
    }
  ]
}

data: {"type":"start"}

data: {"type":"text-start","id":"..."}

data: {"type":"text-delta","id":"...","delta":"Hello"}

data: {"type":"text-end","id":"..."}

data: {"type":"finish","finishReason":"stop","messageMetadata":{"totalTokens":123,"allowanceLeft":"990000000000000000","calculatedPriceWei":"1230000000000000","realPriceWei":"1230000000000000"}}

{
  "id": "chatcmpl-xxxx",
  "object": "chat.completion",
  "created": 1773823863,
  "model": "grok-4-fast",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "xxxxx"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 11,
    "completion_tokens": 323,
    "total_tokens": 334
  }
}