httpbin Test API Verified

Looking at the httpbin service documentation and vendor benchmark guide, I can extract the following structured information:

```json
{
  "service_type": "rest_api",
  "base_url": "https://httpbin.org",
  "auth_method": "none",
  "auth_config": null,
  "endpoints": [
    {
      "path": "/get",
      "method": "GET",
      "purpose": "Returns GET request data including headers, args, and origin",
      "params": {},
      "response_format": "json",
      "is_primary": true
    },
    {
      "path": "/post",
      "method": "POST",
      "purpose": "Returns POST request data including headers, form data, and JSON payload",
      "params": {},
      "response_format": "json",
      "is_primary": true
    },
    {
      "path": "/status/{code}",
      "method": "GET",
      "purpose": "Returns the specified HTTP status code for testing",
      "params": {
        "code": {"type": "integer", "required": true}
      },
      "response_format": "json",
      "is_primary": true
    },
    {
      "path": "/anything",
      "method": "GET",
      "purpose": "Returns anything passed in request data",
      "params": {},
      "response_format": "json",
      "is_primary": false
    },
    {
      "path": "/anything",
      "method": "POST",
      "purpose": "Returns anything passed in request data",
      "params": {},
      "response_format": "json",
      "is_primary": false
    }
  ],
  "pricing_model": {
    "type": "free_tier",
    "details": {},
    "free_tier": {"requests": null, "period": "unlimited"},
    "paid_tiers": []
  },
  "rate_limits": {
    "rpm": null,
    "tpm": null,
    "daily": null,
    "concurrent": null
  },
  "capabilities": [
    "http_request_testing",
    "response_inspection", 
    "status_code_testing",
    "header_manipulation",
    "redirect_testing",
    "authentication_testing",
    "payload_echoing"
  ],
  "agent_readiness": {
    "supports_x402": false,
    "supports_streaming": false,
    "has_sandbox": true,
    "sdks": [],
    "agent_auth_methods": ["public"]
  }
}
```

```json
{
  "tests": [
    {
      "name": "basic_connectivity",
      "endpoint": "/get",
      "method": "GET",
      "headers": {
        "User-Agent": "Prowl-Benchmark/1.0"
      },
      "payload": {},
      "expected_status": 200,
      "expected_behavior": "Returns request metadata including headers and origin",
      "metrics": ["latency", "accuracy", "status_code"],
      "validation": {
        "field": "headers",
        "type": "object",
        "required_keys": ["User-Agent"]
      }
    },
    {
      "name": "post_data_echo",
      "endpoint": "/post",
      "method": "POST",
      "headers": {
        "Content-Type": "application/json",
        "X-Test-Header": "prowl-test"
      },
      "payload": {
        "test_data": "benchmark_payload",
        "timestamp": "2026-04-06T00:00:00Z",
        "number": 42
      },
      "expected_status": 200,
      "expected_behavior": "Echoes back POST data including JSON payload and headers",
      "metrics": ["latency", "accuracy", "status_code"],
      "validation": {
        "field": "json",
        "type": "object",
        "contains": {"test_data": "benchmark_payload"}
      }
    },
    {
      "name": "status_code_success",
      "endpoint": "/status/200",
      "method": "GET",
      "headers": {},
      "payload": {},
      "expected_status": 200,
      "expected_behavior": "Returns HTTP 200 status code as requested",
      "metrics": ["latency", "accuracy", "status_code"],
      "validation": {
        "field": "status",
        "type": "integer",
        "equals": 200
      }
    },
    {
      "name": "error_handling_404",
      "endpoint": "/status/404",
      "method": "GET",
      "headers": {},
      "payload": {},
      "expected_status": 404,
      "expected_behavior": "Returns HTTP 404 status code for error handling test",
      "metrics": ["latency", "accuracy", "status_code"],
      "validation": {
        "field": "status",
        "type": "integer",
        "equals": 404
      }
    },
    {
      "name": "header_manipulation",
      "endpoint": "/get",
      "method": "GET",
      "headers": {
        "X-Custom-Header": "test-value",
        "Authorization": "Bearer fake-token"
      },
      "payload": {},
      "expected_status": 200,
      "expected_behavior": "Echoes back custom headers in response",
      "metrics": ["latency", "accuracy", "status_code"],
      "validation": {
        "field": "headers.X-Custom-Header",
        "type": "string",
        "equals": "test-value"
      }
    },
    {
      "name": "large_payload_test",
      "endpoint": "/post",
      "method": "POST",
      "headers": {
        "Content-Type": "application/json"
      },
      "payload": {
        "large_array": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20],
        "description": "This is a larger payload to test performance with bigger data sets and measure how the service handles more substantial JSON payloads",
        "metadata": {
          "test_type": "performance",
          "benchmark_tool": "prowl",
          "data_size": "medium"
        }
      },
      "expected_status": 200,
      "expected_behavior": "Handles and echoes back larger JSON payloads efficiently",
      "metrics": ["latency", "accuracy", "status_code"],
      "validation": {
        "field": "json.large_array",
        "type": "array",
        "min_length": 20
      }
    },
    {
      "name": "anything_endpoint",
      "endpoint": "/anything",
      "method": "GET",
      "headers": {
        "X-Prowl-Test": "anything-endpoint"
      },
      "payload": {},
      "expected_status": 200,
      "expected_behavior": "Returns comprehensive request information via catch-all endpoint",
      "metrics": ["latency", "accuracy", "status_code"],
      "validation": {
        "field": "method",
        "type": "string",
        "equals": "GET"
      }
    }
  ],
  "pricing_probes": [
    {
      "name": "verify_free_tier",
      "description": "Confirm service remains free with no usage tracking headers",
      "endpoint": "/get",
      "method": "GET",
      "payload": {},
      "check": "response should not contain billing or usage headers since service is completely free"
    }
  ],
  "stress_profile": {
    "concurrent_requests": 8,
    "duration_seconds": 15,
    "ramp_up": true
  }
}
```

6/7 tests passed

{"multi_model": true, "models_used": ["openai", "claude_cli"], "model_scores": {"GPT-4o": {"overall": 85, "dimensions": {"token_efficiency": 10.0, "first_try_success": 7.0, "response_parseability": 9.0, "error_clarity": 7.0, "doc_quality": 9.0, "auth_simplicity": 10.0, "latency": 10.0, "consistency": 10.0}}, "Claude CLI": {"overall": 82, "dimensions": {"token_efficiency": 9.5, "first_try_success": 7.0, "response_parseability": 8.5, "error_clarity": 6.0, "doc_quality": 9.0, "auth_simplicity": 10.0, "latency": 8.5, "consistency": 8.0}}}, "averaged": true}