x402 census · preflight402.com · 34b1584a2aa6 · JSON
POST /v1/deps/check
unprobed
Call before installing packages suggested by a language model. Returns, for each npm or PyPI package name, whether it actually exists in the registry, whether it is deprecated or yanked, and — when the name is not found — the closest real package names. Catches hallucinated dependencies (slopsquatting) before an agent installs them. Never inspects package contents and never returns a safety verdi…
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://preflight402.com/v1/deps/check |
| Method | POST |
| Price | $0.05 USDC = 50000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base) |
| payTo | 0xB9Db3966C7F18283624C97E860a84CEf7f9ba607 |
| Seller | preflight402.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 | 3 calls and 3 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 | Preflight · dependencies, npm, pypi, crates, security |
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 | 2 |
| Payments | 2 |
| USDC volume | $0.10 |
| Median payment | $0.05 |
| First / last payment | 2026-09-17 / 2026-09-30 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0xB9Db3966C7F18283624C97E860a84CEf7f9ba607 |
Declared input and output (extensions.bazaar)
{
"input": {
"body": {
"ecosystem": "npm",
"packages": [
"left-pad"
]
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"type": "json",
"example": {
"checked_at": "2026-09-02T21:40:00Z",
"ecosystem": "npm",
"results": [
{
"exists": false,
"name": "jscodeshift-react",
"official_url": "https://www.npmjs.com/package/jscodeshift-react",
"verdict": "not_found"
}
]
}
}
}
Try it (unpaid: shows the 402)
curl -si -X POST 'https://preflight402.com/v1/deps/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/34b1584a2aa6/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"34b1584a2aa6"} 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 preflight402.com.