What the data for this category looks like
Coking coal yield rate daily report data comes primarily from two sources: the Dalian Commodity Exchange coking coal futures main contract market interface, and a domestic main producing area spot price aggregation platform. Full daily data updates complete by 17:00 each day. Each data entry uses a flat JSON format with no nested levels. Core fields include contract_code, trade_date, settle_price, pre_settle_price, and yield_rate. settle_price and pre_settle_price use yuan/ton as their unit. yield_rate is the daily yield value, with no extra percentage annotation. A single request returns all contract entries for the current day, with no default pagination enabled.
What constraints these characteristics impose on HTTP interfaces and external systems
These characteristics create clear constraints for HTTP interfaces and external systems. Adapting to the compliant exchange interface’s API authentication rules and QPS limits avoids triggering rate limiting blocks. Calibrating scheduled tasks to initiate requests after 17:00 ensures access to the latest daily data. Aligning external system parsing logic strictly to the field names works for the flat JSON structure, which requires no nested level handling. Field spelling errors must be avoided. Handling unit conversion separately for settle_price applies when comparing data across categories, as its unit is yuan/ton. Skipping pagination logic implementation reduces integration complexity, since a single request returns all contract entries. Confirming the interface does not use additional pagination parameters completes this optimization.
How to set configurations
| Configuration Item | Suggested Value | Rationale |
|---|---|---|
tool_call_timeout | 30 seconds | The coking coal data interface typically completes response and parsing within 20 seconds. This value covers normal processing time and temporary network fluctuations, and prevents scheduled task interruptions |
api_request_qps_limit | 1 request per minute | Exchange non-commercial user interfaces usually enforce low QPS limits. Coking coal data updates only once per day, so a higher request frequency is unnecessary |
response_parse_mode | flat_json | Coking coal data uses a flat JSON format. This mode enables direct field mapping, with no additional nested parsing rules required |
field_mapping | {"contract_code": "contract_code", "trade_date": "trading_date", "settle_price": "settlement_price", "pre_settle_price": "pre_settlement_price", "yield_rate": "daily_yield_rate"} | Map the English fields returned by the interface to business-ready Chinese fields, ensuring consistent reading by external systems |
retry_on_failure | 3 retries, 60 second interval | Exchange interfaces occasionally experience temporary rate limiting. Retries reduce request failure probability. The coking coal data update window is limited, so the retry interval matches the update schedule |
plugin_auth_type | api_key | Exchange interfaces generally use API_KEY authentication. Configure the corresponding key to complete identity verification |
The parameter values provided on this page are common starting points for configuration. Actual values are affected by material form, data volume, and business rules. Address specific issues with individual analysis, and test on your own samples before finalizing the configuration.
Three common configuration errors
- Symptom: HTTP requests return a 500 status code, and logs show the
getPluginGroupsinterface call failed. Cause: The API key corresponding toplugin_auth_typeis not configured, or the key has insufficient permissions to access the data source interface. - Symptom: The
yield_ratefield retrieved by scheduled tasks is empty. Cause:response_parse_modeis not set toflat_json, so the parsing logic cannot match the flat JSON fields. - Symptom: Network interception triggers when sending requests from certain regions. Cause: The data source interface’s regional access restrictions are not adapted, and requests are not forwarded through a compliant proxy.
How to verify correct configuration
- A single HTTP request is initiated, and the returned JSON is checked to confirm it includes
contract_code,trade_date,settle_price,pre_settle_price, andyield_rate, with field values matching expected formats. - Tool call logs are reviewed to confirm
tool_call_timeoutdoes not trigger timeout errors, and request duration aligns with configured expectations. - Scheduled task trigger times are checked to confirm requests launch after the data source update completes, and no old data is retrieved.
- The external system’s field mapping configuration is validated to confirm correct correspondence between business fields and interface return fields.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-14.