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Cashu for agents: NUT-24: HTTP 402 Payment Required

YES
Cashu specificationcashux-cashunut-24

The spec that defines the flow: server replies 402 with X-Cashu payment request, client retries with a cashuB token in X-Cashu.

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Proof

“HTTP servers may respond with the HTTP status code 402 and an X-Cashu header containing a payment request”
source: github.com/cashubtc/nuts/blob/main/24.md

Details

Verdict
Yes: the source states it and, where a live endpoint exists, our free unpaid probe agrees.
Category
Cashu specification
Rails
cashu, x-cashu, nut-24
Last checked
2026-10-18

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