x402 census · cors-header-checker.underscoredone.com · fe77862dfd3e · JSON
POST /check
unprobed
Sends a real request to any URL you provide, attaches an Origin header, and reads back all six standard cross-origin permission headers the server returns. Tells you whether cross-origin requests are enabled at all, whether your specific origin is permitted, and shows every permission value exactly as the server sent it. Useful for finding why a browser is blocking a request, confirming a new dep…
Verdict: not verified by an unpaid GET. not probed yet. This says nothing about whether the route works when called as declared.
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://cors-header-checker.underscoredone.com/check |
| Method | POST |
| Price | $0.01 USDC = 10000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base); also accepts solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| payTo | 0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08 |
| Seller | cors-header-checker.underscoredone.com |
| Catalogs | cdp (row updated 2026-09-28) |
| Listed since (lower bound) | 2026-09-28 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-28 |
| CDP quality counters | 4 calls and 4 unique payers in 30 days, last call 2026-09-28 (catalog-reported, not verified on chain) |
| Category (keyword rule) | scrape/browser |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | CORS Header Checker · cors headers, cors, cross origin, access-control-allow-origin, cors policy |
Unpaid probe (census of )
| Field | Value |
|---|---|
| Probe | not probed in this build |
No hourly re-probe has reached this resource yet; the cron covers a rotating slice of 150 per hour.
On-chain facts for the payTo (public address)
| Field | Value |
|---|---|
| Distinct payers | 47 |
| Payments | 85 |
| USDC volume | $0.87 |
| Median payment | $0.01 |
| First / last payment | 2026-06-17 / 2026-09-30 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08 |
Declared input and output (extensions.bazaar)
{
"input": {
"body": {
"origin": "https://myapp.com",
"url": "https://api.github.com"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"type": "json",
"example_truncated": true,
"chars": 706
}
}
Try it (unpaid: shows the 402)
curl -si -X POST 'https://cors-header-checker.underscoredone.com/check' -H 'accept: application/json' -H 'content-type: application/json' --data '{}'
The catalog declares POST. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.
Paid checks (x402, USDC on Base)
GET https://bazaar.agentexchange.work/r/fe77862dfd3e/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"fe77862dfd3e"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.
Catalog references: agentic.market (CDP Bazaar front end) · this record as JSON · all resources on cors-header-checker.underscoredone.com.