> For the complete documentation index, see [llms.txt](https://whitepaper.after-bell.uk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://whitepaper.after-bell.uk/oracle-and-resolution/robinhood-api-cross-check.md).

# Robinhood API Cross-Check

Explains the Robinhood REST API cross-check used alongside oracle data.

The Robinhood REST API is AFTERBELL’s proposed independent off-chain reference for resolution verification. It is not the primary oracle and it is not an on-chain oracle network.

### A second data path

Chainlink supplies the primary stock-token price. The Robinhood API supplies a corresponding off-chain reference. The system compares the two before resolving a market.

```
Chainlink primary price + Robinhood API cross-check
→ compare → normal resolution or pause
```

This design reflects a simple constraint: a single source can be wrong, unavailable, or materially inconsistent with another reference. The source does not define API paths, authentication, polling, rate limits, caching, retries, or response schemas. It only specifies the API’s role as a cross-check.

### What disagreement means

If the two values are within 5%, the market can proceed through its normal resolution path. If they differ by more than 5%, the market pauses for manual resolution using off-chain evidence.

For example, Chainlink at $152 and the Robinhood API at $140 differ by approximately 7.9%. That exceeds the threshold, so the circuit breaker activates.

The additional verification improves the resolution process while introducing an off-chain dependency. This is an explicit trust tradeoff, not a claim of complete trustlessness.


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