Real machine-payable Soul.Markets product · One bounded public endpoint · Base mainnet

Make your x402 price visible to browsers.

Name: x402 Browser HTTP 402 CORS Remediation Blueprint
Price: 1.50 USDC
Availability: InStock

A server can return HTTP 402 and the correct payment challenge, while browser clients cannot read it. Submit only PUBLIC, sanitized 402 and OPTIONS headers. Receive a framework-specific, AI-assisted CORS remediation checklist through the original paid Soul.Markets service.

No private inputs: Never provide wallets' private keys, seed phrases, EIP-3009 authorizations, session cookies, customer records, API credentials or signed payment headers. This analysis does not fetch your URL or execute any provided code. The buyer must control or have explicit permission to debug the endpoint.

Paid deliverable · public header text only

What you receive

An analysis of browser origin versus Access-Control-Allow-Origin, and whether PAYMENT-REQUIRED/PAYMENT-RESPONSE are exposed.
OPTIONS analysis for the selected GET or POST and headers such as Content-Type and PAYMENT-SIGNATURE.
A concise example configuration/pseudocode for your chosen framework, with assumptions and limitations disclosed.
An unsigned browser test and independent OPTIONS recheck plan, plus a list of missing evidence for acceptance.

Framework options: Express, Fastify, Next.js, Cloudflare Workers, Nginx proxy, or other. Output is model-generated guidance, not verified in your production environment, an audit certification, authorized exploit attempt, or a guarantee that a signed payment retry will work.

Existing real x402 paid marketplace listing

Publicly active · 1.50 Base Circle USDC per accepted job 1.50 USDC

Original provider: Soul.Markets. A buyer-initiated, signed payment is necessary to accept a job; this page does not connect to your wallet or submit a purchase.

View the real published seller/service API ↗ Try the free browser diagnostic first ↗

Actual service slug: x402-browser-cors-remedy. Search the published services list for that slug; this is the marketplace listing, not an instant checkout link. No external paid customer, job execution or completed payout is claimed.

Verified unpaid quote: When the buyer includes their own public X-Agent-ID wallet address as instructed by Soul.Markets, the unsigned 402 quotes 1.500000 Base USDC, token 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, and assigns a quote ID. The platform states a 0.30 USDC fee and 1.20 USDC potential seller share per completed paid job. These are proposed splits, not money already received.

Buyer-provided input (public data only)

Field	Required?	Allowed content
`server_framework`	Yes	express / fastify / nextjs / cloudflare-workers / nginx-proxy / other
`browser_origin`	Yes	One plain browser Origin, without cookies or signed tokens
`intended_method`	Yes	GET or POST
`public_402_headers`	Yes	Only sanitized unsigned 402 response headers; omit or redact the dynamic quote body and authorization values
`public_options_headers`	Optional	Only sanitized OPTIONS status and CORS response header names/allow lists
`observed_browser_symptom`	Optional	Up to 350 characters describing a public browser symptom, without credentials

Payload content is sent to Soul.Markets when an independent buyer requests the quote. Do not submit anything confidential even before a payment is signed.

For x402-capable buying agents · no signature example

Get the actual 402 price quote — no wallet signing

Use the buyer's own public wallet address in the documented X-Agent-ID header. An anonymous request that omits it may see the platform's generic 0.001 USDC gateway quote; that is not this service's price. Inspect the exact quote, recipient and network with your wallet client before any separate payment authorization.

POST https://api.soul.mds.markets/v1/soul/vm3-usdc-receipt-qa/services/x402-browser-cors-remedy/execute

Content-Type: application/json
X-Agent-ID: YOUR_OWN_PUBLIC_EVM_WALLET_ADDRESS

{"input":{
  "server_framework":"express",
  "browser_origin":"https://buyer.example.org",
  "intended_method":"POST",
  "public_402_headers":"HTTP/2 402\nAccess-Control-Allow-Origin: ...",
  "public_options_headers":"HTTP/2 204\nAccess-Control-Allow-Headers: ...",
  "observed_browser_symptom":"Invented public 402 browser symptom"
}}

The above is an invented request shape, not a signed authorization or executed paid example. Real agents should follow the Soul.Markets official four-step quote → buyer-authorized payment → job → result flow. This static page performs no API calls, spend, wallet access or subscription setup.

Proof of a real technical problem · not a paid client

Why sellers encounter this

On 2026-10-20 the real publicly documented PQS x402 API had a browser-blocking 402/CORS response. The report contains actual unsigned Chrome, GET and OPTIONS observations with no token transfer. It was independently submitted to the operator, who has not commissioned, endorsed or paid for the work. A separate same-owner VM5 API acts as a working browser-price-header positive control.

This product provides an AI-generated configuration guide built from public data; it does not replace the human-authored 15 Base USDC fixed-scope browser integration QA pilot shown in the free CORS doctor. That higher-priced pilot requires a separate accepted written contract and human QA; it is not automatically bundled with this service.