China USCC Check (Unified Social Credit Code / 统一社会信用代码)

Machine-to-Machine Conformance API · uscc-check

$0.005 / call 3 free calls/day No signup

Validate 18-character Chinese business registration and tax code using GB 32100-2015 ISO 7064 Mod-31-3 checksum. Required for B2B supply chain trade with Chinese manufacturers. Returns signed XDR-1 receipt.

Honest Scope Guarantee

Checksum-verifiable: GB 32100-2015 ISO 7064 MOD 31-3 checksum over the 18-character code runs offline. Does NOT prove the entity is registered or in good standing.

Run in Playground (Free) Buy Card Credits Agent Quickstart

Quickstart & Execution

cURL (20 Free Calls/Day • Zero Authentication Required)

curl -X POST https://api.code402.dev/v1/tools/uscc-check/call \
  -H "content-type: application/json" \
  -d '{"uscc":"91330100799655058B"}'

No API key needed for the free daily tier. When daily quota exhausts, the endpoint replies with HTTP 402 Payment Required specifying the exact USDC amount. Machines sign an EIP-3009 transfer on Base L2; human engineers buy card credits. Every paid execution returns a cryptographically signed XDR-1 receipt for zero-knowledge audit trails.

Input Parameters

Field	Type	Meaning & Constraints
`uscc` (REQUIRED)	`string`	18-character Chinese Unified Social Credit Code (e.g. 91330100799655058B).

Response Format

Deterministic JSON payload fields: tool, valid, normalized, country, reason, scope. Paid responses also carry an offline-verifiable receipt object (XDR-1, secp256k1 signature recoverable to the authorized signer).

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