x402 census · api.magentlab.com · e6dfd2c49eb2 · JSON
POST /api/calc/leiden_arthritis
unreachable
van der Helm-van Mil 2007 Leiden prediction rule for recent-onset undifferentiated arthritis (Figure 1 / Table 2). Age × 0.02, female 1, small joints 0.5, symmetric 0.5, upper 1 or upper-and-lower 1.5, 100-mm morning-stiffness VAS 0/1/2, tender and swollen counts 0/0.5/1, CRP mg/L 0/0.5/1.5, RF 1, anti-CCP 2. Round to nearest 0.0 or 0.5. Bands ≤6 low, >6 and <8 indeterminate, ≥8 high. Not a diagn…
Verdict: dead listing. connection failed or timed out.
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://api.magentlab.com/api/calc/leiden_arthritis |
| Method | POST |
| Price | $0.005 USDC = 5000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base) |
| payTo | 0x836Be278f1739fB4308091cD1852F7971Bc19Ee2 |
| Seller | api.magentlab.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 | 1 calls and 1 unique payers in 30 days, last call 2026-09-28 (catalog-reported, not verified on chain) |
| Category (keyword rule) | trading-signals |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | magent · leiden, undifferentiated-arthritis, rheumatoid, emergency, calculator |
Unpaid probe (census of 2026-09-30)
| Field | Value |
|---|---|
| Probed at | 2026-09-30T23:19:17.299Z |
| HEAD | no answer |
| GET | no answer |
| Verdict | unreachable connection failed or timed out |
| 402 carried in | n/a |
| x402Version in the 402 | n/a |
| accepts[0] | none |
| Live amount equals catalog price | no (live vs catalog 5000) |
| Live payTo equals catalog payTo | no |
| extensions.bazaar in the 402 | no |
| PAYMENT-REQUIRED header | no |
| WWW-Authenticate offer | none |
| Content type / server / CORS | n/a / n/a / none |
| Latency | 0 ms |
| Error | skipped: host unreachable (fetch failed: ECONNRESET) after 3 consecutive connection errors |
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 | 1 |
| Payments | 2 |
| USDC volume | $0.01 |
| Median payment | $0.005 |
| First / last payment | 2026-08-26 / 2026-08-26 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0x836Be278f1739fB4308091cD1852F7971Bc19Ee2 |
Declared input and output (extensions.bazaar)
{
"input": {
"body": {
"items": [
{
"age": 48,
"anti_ccp_positive": false,
"crp_mg_l": 60,
"morning_stiffness_vas_mm": 50,
"rheumatoid_factor_positive": false,
"sex": "female",
"small_joints_hands_feet": true,
"swollen_joint_count": 8,
"symmetric": true,
"tender_joint_count": 8,
"upper_and_lower_extremities": false,
"upper_extremities": true
},
{
"age": 48,
"anti_ccp_positive": false,
"crp_mg_l": 60,
"morning_stiffness_vas_mm": 50,
"rheumatoid_factor_positive": false,
"sex": "female",
"small_joints_hands_feet": true,
"swollen_joint_count": 8,
"symmetric": true,
"tender_joint_count": 8,
"upper_and_lower_extremities": false,
"upper_extremities": true
}
]
},
"method": "POST",
"type": "http"
},
"output": {
"type": "json",
"example_truncated": true,
"chars": 4149
}
}
Try it (unpaid: shows the 402)
curl -si -X POST 'https://api.magentlab.com/api/calc/leiden_arthritis' -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/e6dfd2c49eb2/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"e6dfd2c49eb2"} 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 api.magentlab.com.