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Registration Request: X-402-Challenge #63
Description
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You have read and understood the requirements for registration.
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You have checked the registry and found no current value that meets your needs.
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Your specification reference URL is stable.
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Field Name: X-402-Challenge
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Status: provisional
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Structured Type: Item
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Specification Document(s): https://datatracker.ietf.org/doc/draft-shabazz-http-x402-tswp/ (Section 3.2.1)
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Comments: Issued by servers in HTTP 402 (Payment Required) responses containing an ephemeral RFC 4122 UUIDv4 token for machine-to-machine payment negotiation.
Activity
mnot commentedon Oct 19, 2026
This can be registered when the document is adopted on a stream. Note that it may conflict with use by a recognised SDO, in which case the name will need to change.