numberintel.dev — agent-tools.cloud

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

Paid verification

How it works

No sponsored paid call yet.

Pay this endpoint once from your own wallet (Base USDC, up to $1.00) and we call it and record what came back. Your wallet pays the listed recipient directly; Agent Tools never holds funds. Sponsored checks prove delivery; they do not count as demand.

Quality grade

How grading works

B+ 69.7 / 100

Availability 20.0 / 20

Endpoint responded (HTTP 200)

Payability 15.0 / 15

✓ Answers a real HTTP 402 challenge
✓ Publishes a /.well-known/x402 descriptor
✓ Payment address on record
✓ Settlement network declared
✓ Price declared

Demand 11.7 / 35

7 distinct payers, 39 USDC transfers in the last 30 days

Performance 10.0 / 10

Last probe answered in 173 ms (full marks at 200 ms or less)

Readiness 13.0 / 15

Agent readiness 87/100

Owner verified 0.0 / 5

Nobody has claimed this listing yet

Endpoint last checked 18 h ago. On-chain activity last read 2 d ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass. This grade sets search order and leaderboards; the readiness score below is shown for reference only.

x402 readiness

B · 87/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B+, 69.7/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements	10/10	Payment requirements carry a payee, a mainnet network and a price.
Live 402 challenge	20/25	Endpoint reachable; its 402 challenge was seen earlier (173 ms).
x402 version	n/a	x402 version not observed yet.
Signed descriptor	n/a	No x402 standard defines a signed descriptor.
Uptime (30 days)	15/15	32/32 probes succeeded over 30 days (100%).
Resource declaration	10/10	Declares 11 paid resource(s).
Verified identity	5/10	Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags	5/5	seen in a source within 7 days; declares x402.
Security declaration	n/a	Payment is the access control for an x402 resource.

Applicable criteria total 75 points, scaled to 100.

Responsiveness: Responsive (173 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).

Payment evidence: x402_challenge — We sent a request and got a live HTTP 402 challenge. Also: x402_manifest, bazaar_feed, catalog_listing. Qualifies the payment claim; adds no points.

Measured 2026-11-11.

Nine criteria, the same as the A2A readiness score, read from our daily probe of the paid endpoint, its payment requirements and 30-day probe history. Signed descriptor and security declaration are n/a for x402 (payment is the access control), as is an x402 version we have not observed; the remaining points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. It also feeds 15 points of the x402 quality grade.

Compared with peers

Against 10,082 reachable x402 APIs in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.

Readiness: Higher than 75% of peers; This listing 87 · peer median 78
Latency: Faster than 60% of peers; This listing 173 ms · peer median 205 ms

Where it loses the most points, and how to win them back

Live 402 challenge −5 — Answer the paid path with a valid 402 challenge.
Now: Endpoint reachable; its 402 challenge was seen earlier (173 ms).
Verified identity −5 — Claim the listing and prove control of its domain.
Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.

How many agent tools actually work · All statistics

Paid endpoints

11 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.

GET https://numberintel.dev/v1/carrier

US carrier of record, line type (mobile/landline/VoIP/pager), in-service possibility, rate center, risk hints.

POST https://numberintel.dev/v1/batch

Bulk list scrub: up to 100 numbers per call with validity, in-service possibility, line type, SMS likelihood, carrier and summary counts.

GET https://numberintel.dev/v1/number

Full-number intelligence: E.164 normalization, validity, plausibility, geo, timezones, local time, plus carrier and line type for US numbers.

GET https://numberintel.dev/v1/npa

NANP area code lookup: region, state, country, timezones, live local time, toll-free/premium flags.

GET https://numberintel.dev/v1/attest/preflight

x402 endpoint conformance check: parse the 402, lint accepts[], report quote and problems. No purchase made.

POST https://numberintel.dev/v1/attest

Real-purchase settlement attestation: we buy from the target (up to $0.1), grade delivery vs its advertised schema, and return a signed attestation with the on-chain receipt.

GET https://numberintel.dev/v1/shop-check

x402 shop checkup: audits a seller the way raters, index crawlers, paying agents and the CDP Bazaar see it; every finding with its fix. Read-only.

GET https://numberintel.dev/v1/trust

Can I trust this contact? One verdict from a phone number, email and/or website: dead or VoIP numbers, throwaway emails, brand-new or parked domains, mismatches.

GET https://numberintel.dev/v1/email-grade

Email security grade A-F for any domain: SPF, DKIM, DMARC, MX, MTA-STS, TLS-RPT, certificate health, with a fix for each finding.

POST https://numberintel.dev/v1/text-check

Business texting (10DLC / toll-free) registration pre-check: finds the usual carrier rejection reasons in your brand, use case, sample messages, opt-in flow and privacy policy, with fixes.

GET https://numberintel.dev/v1/sample

Rate-limited preview for schema validation.

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -sS -i -X GET https://numberintel.dev/  # expect HTTP 402 Payment Required (about $0.02/call)

/.well-known/x402.json

https://numberintel.dev/.well-known/x402

Listed in

Directories this entry was found in.

cdp-bazaar since 2026-07-27 x402scan since 2026-09-13 a2a since 2026-10-08 x402 since 2026-10-09