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goodsong.dev verify citation
https://goodsong.dev/verify/citation
answers 402
Verify a citation: does it exist, is it retracted, and do the given title/authors/year/journal match the canonical record? Checked against Crossref (retraction data included) with OpenAlex as a fallback when no DOI is given.
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
- 0xf3b36a95913eb2676fcdedb2ba6b0c96ade58de1
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 79 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:12:07.973Z (23d ago)
- Category
- identity
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fgoodsong.dev%2Fverify%2Fcitation"