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agent-exec /drift — API Drift Detection for x402 Venues
x402
agent-exec /drift — API Drift Detection for x402 Venues is a paid API for AI agents from agent-exec.448c.org, paid per call via x402, $0.0061/call, status unknown (last checked 2026-10-10).
Fetches a snapshot of a known x402 API marketplace venue and compares it against a stored baseline to detect changes (drift) in the live response.
Price / call$0.0061
Success—
StatusUnknown
How this service works
Accountless, pay-per-use code execution for software agents: submit source code, get stdout, stderr and exit code back from an isolated, network-less sandbox. No account, no API key -- possession of valid payment is sufficient.
Output
Returns two response objects: t1 (the archived baseline snapshot) and t2 (the freshly fetched live response), each containing the URL, HTTP status, content-type, body bytes, SHA-256 hash, raw body, and fetch timestamp. Also includes a list of diff events describing what changed between the two fetches, and the venue name.
Example use cases
Monitor x402 marketplace for listing changes
“Has the agentry venue changed since the last baseline was recorded? Fetch the current response and show me any drift events or body differences.”
Verify percall venue content integrity
“Compare the live percall x402 venue against its stored baseline and tell me if the SHA-256 hash matches — I want to confirm nothing has changed.”
Audit verantis endpoint for API updates
“Run a drift check on the verantis venue and let me know if the HTTP status, content-type, or body has changed since the last snapshot.”
Technical details
Endpoint
POSThttps://agent-exec.448c.org/drift?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to detect drift or changes in one of the five pre-indexed x402 API venue snapshots (agentry, clearedindex, percall, verantis, x402-list). It is ideal for monitoring whether AI agent API marketplaces have updated their listings, changed status codes, or altered their response bodies since a known baseline. Prefer this over generic HTTP diff tools when operating within the x402 pay-per-use micropayment ecosystem with no account setup required.
Side effects
- Invalid venue value — only agentry, clearedindex, percall, verantis, and x402-list are accepted; any other value returns a 400 or validation error
- Live fetch failure — t2 fields (body, sha256, http_status, content_type) may be null if the upstream venue URL is unreachable
- Payment not included or invalid — returns HTTP 402 requiring x402-compatible payment of 0.0061 USDC before the request is processed
- Venue URL redirected — t2 URL will reflect the final redirected URL, which may differ from the baseline t1 URL
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| venuerequired | string | One of the endpoints we already snapshot. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| t1required | object | |
| t2required | — | |
| venuerequired | string | |
| eventsrequired | — | Our typed diff between t1 and t2, or null if t2's body did not parse as JSON (or t1 has no recorded fingerprint) -- verify against t1.body/t2.body yourself rather than trusting this. |
| payment | object | Always present -- POST /drift and POST /drift/{venue} are both paid, unlike GET /drift/{venue}'s free baseline check. |
Tags
x402
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