Endpoint · extractionPOSTdomain-availability-checker.underscoredone.com/check

Give this API up to 10 domain names and it tells you whether each has a registration record at the official registry.

Give this API up to 10 domain names and it tells you whether each has a registration record at the official registry. It uses RDAP, the structured replacement for WHOIS, so there is no free-text parsing. Each domain comes back as 'registered', 'unregistered', or 'indeterminate' when the registry has no RDAP for that ending. 'Unregistered' means no record was found, which usually means available - but reserved and premium names also return no record. Registration status only; no pricing.

UNRATEDListed

Overview

Grade?

UNRATED

0 of 30 paid calls toward a letter

Price

$0.01 per call

Paid calls

none yet

delivery unknown until someone pays

More info

Seller?

0xe9740820…0e2c2f08

URL

https://domain-availability-checker.underscoredone.com/check

Seen

first 29 days ago · last 16 hr ago

54 free handshakes

Payment

Pays through

x402

Offered on?

Base USDC, Solana

Listed on?

Base, Solana

Score, from free handshakes onlyweights 2026.09.6

UN
RATED

0.730 liveness verified, no letter

To a letter · 30 paid calls

0 of 30

Held down by latency p95 · gap to 1.000 is 0.270: 0.070 uncertain ? + 0.200 short ? · 0.070 to B

How the composite of 0.730 is made up, part by part
Component	Weight	Measured	Lower bound ?		Adds	Short ?	Uncertain ?
latency p95costs the most it answered as fast as its class	0.20	0.00	0.000		0.000	−0.200	0
liveness it answered at all	0.60	1.00	0.884		0.530	0	−0.070
price stability the price stayed where it was listed	0.20	1.00	1.000		0.200	0	0
Composite	1.00		0.730	gap to 1.000 = 0.270 · 0.200 short · 0.070 uncertain	0.730	−0.200	−0.070

Not measured: correctness · nobody paid; honesty · nobody paid; schema conformance · no answer had a published shape to check

The multiplication, written out

  0.200 × 0.000   latency p95    
+ 0.600 × 0.884   liveness       
+ 0.200 × 1.000   price stability
= 0.730           → UNRATED: 53 of 30 paid calls      weights 2026.09.6 · 53 samples · seed cap_01M1RD8D2SAA09PT2X6A34NA8C|2026-09-03T21:43:19.258Z|2026.09.6

Verify it yourselfnpx teppi-check https://domain-availability-checker.underscoredone.com/checkcurl -s https://api.teppi.xyz/v1/trust/cap_01M1RD8D2SAA09PT2X6A34NA8C