Endpoint · computePOSTgoodsong.dev /verify/seller
Verify an x402 seller before paying it: does it exist and respond with a well-formed 402 challenge, is its own declared input/output schema internally consistent, and is its…
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Verify an x402 seller before paying it: does it exist and respond with a well-formed 402 challenge, is its own declared input/output schema internally consistent, and is its payout address sanctioned? Checked live against the seller itself plus Chainalysis's sanctions oracle and Blockscout (Base payTo addresses only). Confirms the checkable things about a seller check out -- not a guarantee of trustworthiness, which no free source can promise.Overview
Grade?
UNRATED
0 of 30 paid calls toward a letter
Price
$0.005 per call
Paid calls
none yet
delivery unknown until someone pays
More info
Seller?
URL
https://goodsong.dev/verify/seller
Seen
first 29 days ago · last 1 day ago
54 free handshakes
Payment
Pays through
x402
Offered on?
Base USDC
Listed on?
Base
Score, from free handshakes onlyweights 2026.09.6
UN
RATED
RATED
0.729 liveness verified, no letter
To a letter · 30 paid calls
0 of 30
Held down by latency p95 · gap to 1.000 is 0.271: 0.071 uncertain ? + 0.200 short ? · 0.071 to B
| 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 | 0.882 | 0.529 | 0 | −0.071 | |
| price stability the price stayed where it was listed |
0.20 | 1.00 | 1.000 | 0.200 | 0 | 0 | |
| Composite | 1.00 | 0.729 | gap to 1.000 = 0.271 · 0.200 short · 0.071 uncertain | 0.729 | −0.200 | −0.071 |
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 × 0.882 liveness
+ 0.200 × 1.000 price stability
= 0.729 → UNRATED: 52 of 30 paid calls weights 2026.09.6 · 52 samples · seed cap_01M1RD8PDPR3TPM5BHTREKSJSD|2026-09-03T03:21:57.983Z|2026.09.6
Verify it yourself
npx teppi-check https://goodsong.dev/verify/sellercurl -s https://api.teppi.xyz/v1/trust/cap_01M1RD8PDPR3TPM5BHTREKSJSD