HTTP Interfaces and External Systems for Chemical Raw

What the data for this category looks like

Data for chemical raw materials comes from industry association public monitoring databases, General Administration of Customs import and export announcement documents, and monthly production capacity disclosure materials from manufacturing enterprises. Update cycles fall into three categories:

Spot transaction prices are updated daily
Import and export clearance data is updated weekly
Production capacity and total inventory data is updated monthly

Interface responses use standardized JSON format, and include these fields: general raw material name, CAS registry number, origin code, average spot transaction price, weekly total inventory, number of core manufacturing enterprises. Units follow these standards: average price is measured in yuan per ton, total inventory is measured in tons, and the number of enterprises is an integer.

What constraints these characteristics impose on HTTP interfaces and external systems

Data sources are scattered and use varied authentication methods. Multiple distinct interfaces must be integrated. Some interfaces use API key verification, while others use OAuth2 authorization. Multiple sets of authentication rules must be configured in external systems. Significant differences in update cycles require layered scheduled scheduling tasks. This prevents quota exhaustion from high-frequency calls to daily-updated spot interfaces, while ensuring timely retrieval of low-frequency updated inventory data. Fields include unique identifiers such as CAS registry numbers. Precise parameters must be included in interface requests to avoid matching errors for raw materials with identical names. Unit formats vary across data sources. Unified conversion to standard units must be performed after receiving interface responses to meet display requirements for due diligence reports. When connecting to internal enterprise due diligence systems, internal system field mapping rules must be adapted. This ensures one-to-one correspondence between interface return fields and internal system fields.

How to set the configurations

Configuration Item	Recommended Value	Rationale
`external_api_auth_type`	`api_key + signature`	Most chemical raw material data sources use signature verification to prevent unauthorized calls, which balances security and docking efficiency
`external_api_request_interval`	`10–30 seconds`	Excessive call frequency for spot price interfaces triggers rate limiting. This range aligns with rate limiting thresholds for most industry data sources
`external_api_timeout`	`600 seconds`	Some customs interface data retrieval requires batch processing. A longer timeout period prevents mid-process interruptions
`field_mapping_strategy`	`Precise matching of CAS numbers`	Many chemical raw materials share the same name. Using CAS numbers as unique identifiers avoids data matching errors
`batch_fetch_size`	`20–50 entries`	Too many returned entries per request causes interface response timeouts. This range balances data retrieval efficiency and stability
`retry_on_failure`	`3 times`	Network fluctuations and temporary interface failures are common. Limited retries improve data retrieval success rates

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. Specific issues require individual analysis. It is recommended to test on your own samples before finalizing settings.

Three common mistakes

Scenario: Interface returns status code 429 Too Many Requests, and the configured external_api_request_interval is 5 seconds. Cause: The rate limiting threshold of the industry data source is not matched, and high-frequency calls trigger temporary interface blocking.
Scenario: Incorrect data for raw materials with the same name appears in the due diligence report, and the configured field_mapping_strategy is Match raw material name. Cause: Many chemical raw materials share the same name but different origins or specifications. Matching only by name cannot accurately associate corresponding data.
Scenario: Inconsistent units appear in data retrieved via interfaces, with some values shown as yuan/kilogram and others as yuan/ton. Cause: No unified unit conversion rules are configured, and original interface data is directly used to populate report content.

How to confirm the configuration is complete

Call the configured external interface, check if the returned fields correspond to the preset matching rules, and confirm that CAS number matching is active.
Simulate a scheduled scheduling task, check if the interface call interval matches the configured external_api_request_interval, and confirm that the rate limiting rule is operating normally.
Trigger a single batch data retrieval, check if the returned data units are unified, and confirm that the unit conversion rule has been configured.
Simulate an interface timeout or temporary failure scenario, check if the configured retry logic is triggered, and confirm that the retry mechanism is working correctly.

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.