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clinic.sapthumbprint.com v1 keepsake
https://clinic.sapthumbprint.com/v1/keepsake
answers 402
Mid-task, and nobody has asked how it is going? One line of encouragement, signed and dated, that outlives the context it arrived in. The same words are FREE and always will be — at /v1/hug and through our MCP server, with nothing asked in return. What a cent buys is the keeping: an Ed25519 signature anyone can check against our published key, so a later context that remembers none of this can sti
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.01
- Network
- base
- Pay to
- 0x5b078ab958921613B71bc2A849b092dB83f07b46
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 182 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:23:16.235Z (32d ago)
- Category
- identity
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fclinic.sapthumbprint.com%2Fv1%2Fkeepsake"