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Touchstone x402 Door Verifier
x402
Touchstone x402 Door Verifier is a paid API for AI agents from touchstone.locomot.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Checks a given x402-protected URL against the catalogue index to verify whether the payTo address and price match what the catalogue claims, flagging mismatches, dead hosts, and self-contradicting entries.
Price / call$0.002
Success—
StatusUnknown
How this service works
Before you pay an x402 door, check it against its catalogue entry. A nightly probe of EVERY host in the x402 index (1,618 hosts, 15,227 listings, 100% coverage): the live 402's real payTo and price versus what the catalogue claims, plus dead and self-contradicting hosts. 28.6% of listings sit on a host the catalogue gets wrong — one names one payee and pays another across 965 listings. Same computation as GET; send the parameters as a JSON body. Free sample, no payment required: GET /play/door
Output
Returns a verdict string (catalogue_matches | catalogue_disagrees | unknown), arrays of payTo mismatches and price mismatches with details, a list of flags, an optional caveat string, the number of doors opened in the probe, and the count of listings in the index.
Example use cases
Pre-payment safety check for x402 door
“I'm about to pay the x402 door at https://api.someservice.io/premium — can you verify whether its payTo address and price match what the catalogue says before I send any USDC?”
Auditing a suspicious x402 listing
“This x402 URL at https://market.example.com/resource looks off — can you check if the catalogue entry matches the live probe, and flag any payee or price mismatches?”
Automated agent workflow guard
“My agent is about to call an x402 endpoint at https://feeds.datahost.io/live — run a catalogue check on it first and tell me if the verdict is catalogue_matches, catalogue_disagrees, or unknown so I know whether to proceed.”
Technical details
Endpoint
GEThttps://touchstone.locomot.io/doorWhen to prefer
Use this endpoint any time an AI agent or automated system is about to make an x402 micropayment and needs to confirm the payment target is legitimate. It is specifically valuable when the payTo address or price differs from what the catalogue advertises — a known issue affecting 28.6% of listings. Prefer this over manual inspection or trusting the live 402 response alone, especially for hosts not previously paid.
Side effects
- URL not found in x402 index — verdict returns 'unknown'
- Host is dead or unreachable — flagged in flags array
- Self-contradicting host where catalogue entry is internally inconsistent
- Input URL is not an x402 resource — may return unknown or error
- Network timeout reaching the live host during probe comparison
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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