```json
{
"tests": [
{
"name": "healthcheck_endpoint_test",
"endpoint": "/v1.1/healthcheck",
"method": "GET",
"headers": {},
"payload": {},
"expected_status": 200,
"expected_behavior": "Returns service health status",
"metrics": ["latency", "status_code"],
"validation": {"field": "status", "type": "string", "min_length": 1}
},
{
"name": "quote_endpoint_basic_test",
"endpoint": "/v1.1/quote",
"method": "GET",
"headers": {},
"payload": {"fromTokenSymbol": "ETH", "toTokenSymbol": "DAI", "amount": "1000000000000000000"},
"expected_status": 200,
"expected_behavior": "Returns exchange rate for token swap",
"metrics": ["latency", "accuracy", "status_code"],
"validation": {"field": "toTokenAmount", "type": "string", "min_length": 1}
},
{
"name": "swap_endpoint_test_valid_payload",
"endpoint": "/v1.1/swap",
"method": "POST",
"headers": {},
"payload": {"fromTokenSymbol": "ETH", "toTokenSymbol": "DAI", "fromAddress": "0x0000000000000000000000000000000000000000", "amount": "100000000000000", "slippage": 1},
"expected_status": 200,
"expected_behavior": "Executes token swap",
"metrics": ["latency", "status_code"],
"validation": {"field": "transaction", "type": "object", "min_length": 1}
},
{
"name": "tokens_list_test",
"endpoint": "/v1.1/tokens",
"method": "GET",
"headers": {},
"payload": {},
"expected_status": 200,
"expected_behavior": "Returns list of available tokens",
"metrics": ["latency", "accuracy", "status_code"],
"validation": {"field": "tokens", "type": "array", "min_length": 1}
},
{
"name": "error_handling_test_invalid_pair",
"endpoint": "/v1.1/quote",
"method": "GET",
"headers": {},
"payload": {"fromTokenSymbol": "INVALID", "toTokenSymbol": "INVALID", "amount": "1000000000000000000"},
"expected_status": 400,
"expected_behavior": "Returns error for invalid token pair",
"metrics": ["status_code"],
"validation": {"field": "error", "type": "string", "min_length": 1}
}
],
"pricing_probes": [],
"stress_profile": {
"concurrent_requests": 5,
"duration_seconds": 10,
"ramp_up": true
}
}
```