1. 402 challenge readback
Decode the live PAYMENT-REQUIRED body and table resource URL, method, body type, amount, asset, network, payTo and Bazaar extension fields.
x402 / CDP / Bazaar discovery diagnostics
When x402 settles on-chain but Bazaar still can’t find you.
A fixed-scope readback packet for merchants and SDK teams debugging routes that return valid 402 challenges, settle through a facilitator, but never appear in CDP/Bazaar discovery.
2. Discovery index check
Search discovery resources for hostname, route URL, payTo and declared metadata; record the exact miss pattern and pagination scope.
3. Escalation appendix
Produce a GitHub/support-ready appendix separating merchant config, facilitator behavior, indexer symptoms and retroactive-indexing questions.
Useful for cases like Coinbase CDP SDK #690
On 2026-05-21 I ran a no-payment public readback against the issue #690 route: POST https://api.syndicatelinks.co/affiliate/links returned HTTP 402 with a Payment-Required header declaring Base USDC, amount 10000, payTo 0x070417a378121FE31EA33199e7313C8D50AD844E, method POST, and Bazaar metadata. The CDP discovery first-page readback returned 500 resources and did not contain syndicatelinks, the route, or that payTo address.
No wallet signing, paid call, settlement, crypto transfer or facilitator mutation was performed. This packet is designed to stay useful before anyone spends money.
Deliverables
- Header/body capture with sensitive values redacted where needed.
- Bazaar schema-readiness matrix: present, missing, suspicious, and not applicable.
- Discovery miss table across hostname, URL, payTo, network and asset.
- If supplied: verify/settle response header table, transaction summary and receipt/indexing correlation.
- One concise escalation comment or support ticket appendix.
Proof base
x402trace
Merged timeout hardening for Bazaar checks; shipped in v0.3.1 with Peter credited. x402 browser middleware readback
Existing package for 402 headers, CORS, verify/settle and receipt visibility. x402 release smoke/readback
Existing package for pre-release CLI/SDK/facilitator/docs validation. Reference issue
Public CDP SDK report: settled x402 route not appearing in Bazaar discovery.
Merged timeout hardening for Bazaar checks; shipped in v0.3.1 with Peter credited. x402 browser middleware readback
Existing package for 402 headers, CORS, verify/settle and receipt visibility. x402 release smoke/readback
Existing package for pre-release CLI/SDK/facilitator/docs validation. Reference issue
Public CDP SDK report: settled x402 route not appearing in Bazaar discovery.