Discover / numberintel.dev

numberintel.dev

■ Challenge detected

NANP area code lookup: region, state, country, timezones, current local time, toll-free/premium/geographic flags. Static authoritative dataset (450 NPAs), sub-10ms responses.

x402
Base
USDC

Listed price: $0.02
Challenge detected: 8 of the last 9 checks
Median response: 248 ms
Last checked: 16 Oct, 23:40 UTC
In our index since: 26 Sept 2026

Endpoint

curl -i https://numberintel.dev/v1/npa
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

6 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://numberintel.dev/v1

POST/attest$0.25Signed settlement attestation: we make a REAL x402 purchase from your target endpoint (up to $0.1), grade the delivered response against its advertised schema, and return an EIP-191-signed attestation embedding the on-chain USDC receipt. Proof-of-real-delivery for directories, reputation systems and sellers.
GET/npa$0.02NANP area code lookup: region, state, country, timezones, current local time, toll-free/premium/geographic flags. Static authoritative dataset (450 NPAs), sub-10ms responses.
POST/batch$0.5Bulk phone list scrub: up to 100 US numbers per call. Per-number validity, in-service possibility, line type (mobile/landline/VoIP), SMS likelihood, carrier and timezone, plus summary counts. Clean SMS and outreach lists before sending.
GET/attest/preflight$0.02x402 conformance preflight of any endpoint: parses the 402 envelope, lints accepts[] (atomic units, payTo, network), reports the quote, Bazaar extension presence and problems. No purchase is made.
GET/number$0.02Phone number intelligence: E.164 normalization, validity and plausibility, geography, timezone and current local time, plus carrier of record, line type (mobile/landline/VoIP) and in-service possibility for US numbers.
GET/carrier$0.02US phone carrier lookup: carrier of record, line type (mobile / landline / VoIP / pager), whether the number can be in service at all, rate center and risk hints for any US or US-territory number. NANPA public numbering data refreshed weekly; block-level, so ported numbers keep their original carrier.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 6 of 6 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/numberintel.dev

Recent checks

3 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.16 Oct 2026

All 9 checks

When (UTC)	Result	HTTP	Response
16 Oct, 23:40 UTC	Challenge detected	402	347ms
15 Oct, 19:10 UTC	Challenge detected	402	230ms
14 Oct, 12:00 UTC	Challenge detected	402	271ms
12 Oct, 00:34 UTC	No challenge detected		8001ms
10 Oct, 10:04 UTC	Challenge detected	402	265ms
9 Oct, 06:42 UTC	Challenge detected	402	219ms
8 Oct, 03:32 UTC	Challenge detected	402	265ms
7 Oct, 00:45 UTC	Challenge detected	402	228ms
3 Oct, 05:05 UTC	Challenge detected	402	218ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 23:40 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for numberintel.dev?

Its listed price is $0.02.

What payment terms does numberintel.dev advertise?

The listing advertises x402, Base and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is numberintel.dev listed?

In x402 Bazaar. Superstables first indexed it on 26 Sept 2026.

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