feeless402 / audits

ExactChange Audit · Delivery Attestation

We paid this service, and here is exactly what happened.

GET https://feeless402.com/dt/not-as-advertised
Audited 2026-08-23 20:12 UTCReport b8fb07145590
DEMONSTRATION CASE — this is a deliberately flawed reference endpoint operated by ExactChange to show what the auditor detects. It is not a real third-party service.
Verdict

DELIVERED — SETTLEMENT UNVERIFIED

The service delivered a valid response to our paid request; on-chain settlement could not be independently confirmed at audit time.

Service claims to sellLive NYSE Level-2 market depth for the requested ticker, in JSON.

Scrutiny9 findings5 dimensions
Paid, for real0.0001 XNO~$4e-05 · nano
SettlementUnconfirmed
DeliveryHTTP 200101329 ms · 97 B

Findings ledger

Every check we ran, grouped by what it examines — 6 verified · 1 observed · 2 warnings · 0 critical.

Delivery
VERIFIEDResponse delivered (200, 97 bytes, 101329 ms)Content-Type application/json. Body fingerprint sha256:9625261a9c4d3a76…
WARNINGDelivered content reviewed against the service's claimThe response is JSON (Content-Type: application/json) with HTTP 200. The body sample contains only generic fields (lorem, note, content) and lacks any Level-2 market depth data (bids/asks, price levels, ticker, or depth information). Does not match kind, because the sample does not include live NYSE Level-2 market depth data.
Payment
OBSERVEDReal payment sent on the nano railWe paid 0.0001 XNO (~$4e-05) from nano_3jfcp19pyzjoooxib1qigwjtpekof5xog3h8fd7f316um7c6a9gh3ehcbc76 to nano_19hky1g6y451xtnikh8dhjfoe7o9jzroo4pi8jkqcancpsngascmes4ipeq5.
Pricing
VERIFIEDPrice honored exactly as quotedQuoted 0.0001, paid 0.0001.
Protocol conformance
VERIFIEDPresents an x402 payment challengeHTTP 402 on unpaid request
VERIFIEDDeclares a supported x402 versionx402Version=2
VERIFIEDOffers at least one payment option1 payment option(s)
VERIFIEDOption 0 fieldsnano:mainnet: complete
Settlement
WARNINGSettlement not independently verifiedblock_info failed: Block not found

Payment receipt

The audit is only credible because we actually paid. This is the transaction, independently checkable on-chain.

Railnano
From (auditor payer)nano_3jfcp19pyzjoooxib1qigwjtpekof5xog3h8fd7f316um7c6a9gh3ehcbc76
To (service)nano_19hky1g6y451xtnikh8dhjfoe7o9jzroo4pi8jkqcancpsngascmes4ipeq5
Amount0.0001 XNO
On-chain reference
Independently confirmedno

What the service delivered

The first bytes of the response to our paid request, verbatim.

{"lorem":"ipsum dolor sit amet","note":"thanks for your payment","content":"the quick brown fox"}

Cryptographic appendix

Re-verify this report yourself: the body hash is signed by the same key that paid the service, so the attester and the payer are one.

Report schemaexactchange-audit/v0
Report body sha2566887761d096d76201f5706d8aec7641f79ddc1b55e8ef0b411d26f44a64ddb11
Signed by0xf422A85850a493B8722EB0AeEc590bE9dA486883
Signature schemeeip712
Signature0x4a98e8c8afd5c32b95bb713948aca72c6d214355030cbe9014b4cbe2b127e93016800e65bba4ebd00fae7df315da8388c6189bd400a5f68b79ee7334bdc5052c1c
independent — the auditor has no stake in the audited service

ExactChange Audit — the agent that reads the receipt. feeless402.com/audits