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An x402 endpoint can accept payments and still be absent from a Bazaar catalog: payment settlement and discovery are separate. For a listing to appear, the route needs valid Bazaar metadata, a client must carry that metadata into a payment payload, and the facilitator that settles the payment must process and expose it in its catalog. Check those stages in order, then query the correct facilitator’s discovery API.
How Bazaar discovery differs from payment settlement
x402 payment middleware can authorize and settle a request without creating a catalog listing. Discovery is an independent facilitator-operated feature, not an automatic consequence of a successful payment. The x402 Foundation’s Bazaar troubleshooting documentation makes this distinction explicit; facilitators control catalog behavior and indexing.
The metadata must make a complete trip: the server declares the Bazaar extension on the protected route, the payment-required response advertises it, the client echoes it in the PaymentPayload, and the facilitator processes that payload. A missing step can leave payments working while discovery does not.
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Check these 10 causes and fixes
1. The route does not declare the Bazaar extension
Payment middleware by itself does not add discovery metadata. Attach the Bazaar declaration to the protected route using the official helper for your framework and SDK version. The TypeScript extension README documents helper-based route configuration: x402 TypeScript extension documentation.
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2. No paid request has carried the declaration through settlement
A server-side declaration is not enough to create a catalog record. After confirming the client preserves the extension, make a paid request through the public endpoint so a PaymentPayload containing the declaration reaches settlement.
3. The client does not echo metadata from the payment-required response
The server advertises discovery data in the HTTP PAYMENT-REQUIRED header, or in an MCP tool result’s structuredContent. The client is expected to copy that data into its PaymentPayload. Inspect both the response and the payload sent for settlement; a correct route declaration cannot compensate for a client that drops the metadata.
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4. The declaration is malformed or incomplete
Validate the declaration against the schema for your SDK version. The documentation identifies common shape errors, including a missing info.input.type, a missing info.output.type when output is present, and malformed accepts entries—for example, putting an object where the asset string belongs or omitting an amount in atomic units. See the Bazaar schema and troubleshooting guidance.
5. The resource URL is relative or points to the wrong endpoint
The extension requires an absolute resource URL. The facilitator records the URL it receives in the payment payload; it does not discover the intended public address by crawling your host. If the paid request was made against localhost, the catalog may record a localhost URL. Use the public endpoint URL and inspect the resource value in the payload.
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6. The schema refers to unsupported external definitions
Bazaar schema references using external, file, or relative URIs are rejected. Keep references within the same document, using JSON Pointer fragments such as #/definitions/foo, and validate the schema before sending paid traffic.
7. One or more metadata fields fail validation
Invalid service metadata may be dropped field by field. A successful payment therefore does not prove every discovery field was accepted. Correct invalid fields and check the resulting catalog entry rather than treating settlement success as metadata validation.
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8. You are querying the wrong facilitator, network, or page of results
There is no single universal Bazaar catalog guaranteed to show every x402 service. Query the discovery endpoint of the facilitator that processed the payment, and verify filters such as payTo, network, type, and scheme. Check limit and offset as well: pagination can hide an entry outside the page you requested. The Bazaar documentation describes discovery as facilitator-specific.
9. Indexing is still processing, or a response header is being misread
Catalog inclusion can be asynchronous. If an EXTENSION-RESPONSES header is present, inspect bazaar.status and rejectedReason; a processing status means indexing is not complete. If the header is absent, that absence carries no signal—it does not establish either success or failure.
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10. The issue is leaderboard attribution, not Bazaar discovery
A missing campaign tag can affect attribution on the Global x402 Challenge leaderboard even when payment and Bazaar discovery work. Algorand Foundation support engineer Mohammad Mudassir described this distinction on August 13, 2026, in the Foundation’s x402 guidance. Check the discovery API first; investigate campaign-specific tags separately if the listing is present but leaderboard credit is not.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Trace one request from route to catalog
- Record the request context. Note the facilitator URL, network,
payToaddress, and public endpoint URL used for the paid request. - Inspect the route configuration. Confirm the Bazaar extension is declared on the protected route.
- Inspect the payment-required response. Check that the extension appears in the HTTP response or MCP result and that its fields validate.
- Inspect the client’s PaymentPayload. Confirm it echoes the discovery declaration instead of discarding or modifying it.
- Confirm settlement received that payload. Verify a real paid request containing the extension reached the facilitator.
- Query that facilitator’s catalog. Request
/discovery/resources, first without restrictive filters; then verify filter values and paginate withlimitandoffset. - Allow for processing. If the entry remains absent, give the facilitator or catalog operator the route, relevant payload fields, payment transaction reference, and exact query used. Catalog inclusion is outside the x402 open-source repository’s control.
Choose SDK helpers or a hand-built declaration
The practical choice is between a maintained SDK helper and constructing the extension schema yourself. The official documentation recommends official or maintained SDKs; helpers can reduce schema-shape errors, but compatibility still depends on your framework and x402 version. Whichever approach you use, inspect the declaration that the client actually echoes through settlement. The TypeScript extension README describes helper-based route configuration.
Confirm the facilitator’s catalog and network support
Facilitators may operate separate discovery layers, so a listing in one catalog does not imply a listing in another. Check the selected facilitator’s catalog endpoint, filters, supported networks, indexing behavior, and support channel. Network availability changes: the official Bazaar FAQ lists Base, Base Sepolia, Solana, and Solana Devnet with USDC, but confirm current support with the facilitator handling your payment. See the x402 documentation.
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