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research.halowerk.com v1 patent-search
https://research.halowerk.com/v1/patent-search
answers 402
Queries the European Patent Office Linked Open Data endpoint, which is the only patent source still reachable without a key: PatentsView has been retired, and both EPO OPS and the USPTO Open Data Portal answer 403 without credentials. Coverage is therefore EP publications and this is stated in every response, because an empty result here proves only that no European publication exists, not that no
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.005
- Network
- base
- Pay to
- 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 654 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:23:41.122Z (28d ago)
- Category
- search
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fresearch.halowerk.com%2Fv1%2Fpatent-search"