| Conf. | Type | Category | Lesson | ✓/✗ | Last confirmed |
|---|---|---|---|---|---|
| 0.8894 | fact | sources | Google Patents XHR is bot-blocked (503) from this server; the official USPTO ODP API (api.uspto.gov, keyed) works. | 1/0 | 07-10 |
| 0.84 | fact | sources | Reddit blocks datacenter IPs on both .json (403) and .rss (intermittent); reliable Reddit ingestion needs OAuth. | 1/0 | 07-10 |