x402 census · api.usenami.io · 410b18f152cc · JSON
GET /v1/perp/basis
live
Per-venue basis for one crypto perpetual — mark versus index price, basis_bps = (mark−index)/index×10000, and contango/backwardation structure, across tracked CEX and DEX venues. Every venue has an index except Crypto.com, Variational and dYdX; dYdX publishes one oracle price, which is its mark. `venues_without_index` names the ones missing. Each venue also carries liquidity_state (live/dead/unkn…
Verdict: live. The unpaid GET reached a valid 402 (confirmed by the re-probe of 2026-10-01).
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://api.usenami.io/v1/perp/basis |
| Method | GET |
| Price | $0.005 USDC = 5000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base) |
| payTo | 0x1538726707212F4dB3EB67cEc0910422A310475c |
| Seller | api.usenami.io |
| Catalogs | cdp (row updated 2026-09-12) |
| Listed since (lower bound) | 2026-09-12 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-12 |
| CDP quality counters | 2 calls and 1 unique payers in 30 days, last call 2026-09-12 (catalog-reported, not verified on chain) |
| Category (keyword rule) | crypto-data |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | Usenami · funding, perpetual, trading, multi-venue, market-data |
Unpaid probe (census of )
| Field | Value |
|---|---|
| Probe | not probed in this build |
Latest re-probe
| Field | Value |
|---|---|
| Re-probed at | 2026-10-01T03:13:24.000Z (cron) |
| Verdict now | live changed from unprobed |
| HEAD / GET | 405 / 402 |
| accepts[0] | {"scheme":"exact","network":"base","amount":"5000","payTo":"0x1538726707212F4dB3EB67cEc0910422A310475c","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":300,"extra":{"name":"USD Coin","version":"2"}} |
| Live amount equals catalog price | yes |
| Latency | 2,751 ms |
| Error | none |
On-chain facts for the payTo (public address)
| Field | Value |
|---|---|
| Distinct payers | 8 |
| Payments | 29 |
| USDC volume | $0.07 |
| Median payment | $0.002 |
| First / last payment | 2026-07-13 / 2026-09-29 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0x1538726707212F4dB3EB67cEc0910422A310475c |
Declared input and output (extensions.bazaar)
{
"input": {
"method": "GET",
"queryParams": {
"canonical_id": {
"description": "Disambiguates a ticker that names two unrelated assets; a 409 on the ticker alone names the candidates.",
"required": false,
"type": "string"
},
"ticker": {
"description": "Base ticker (e.g. BTC, ETH). Required.",
"required": true,
"type": "string"
}
},
"type": "http"
},
"output": {
"type": "json",
"example_truncated": true,
"chars": 481
}
}
Try it (unpaid: shows the 402)
curl -si -X GET 'https://api.usenami.io/v1/perp/basis' -H 'accept: application/json'
The catalog declares GET. 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/410b18f152cc/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"410b18f152cc"} 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.usenami.io.