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Halowerk Twin Diff
x402
Halowerk Twin Diff is a paid API for AI agents from agent.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).
Compares two JSON state documents (target vs observed) leaf-by-leaf and returns a per-path status indicating tolerance, deviation, missing, unexpected, or type-mismatch conditions.
Price / call$0.003
Success—
StatusUnknown
How this service works
Takes two state documents — target (what the twin should look like) and observed (what was measured) — and returns a leaf-by-leaf comparison. Every leaf path carries one of five states: in_tolerance, out_of_tolerance, missing_in_observed, unexpected_in_observed or type_mismatch.
Output
A leaf-by-leaf comparison result where every path in either document is assigned one of five statuses: in_tolerance (numeric values agree within threshold), out_of_tolerance (numeric deviation exceeds threshold), missing_in_observed (path exists in target but not observed), unexpected_in_observed (path exists in observed but not target), or type_mismatch (same path but different data types). Each result entry echoes the unit if declared in the tolerances input.
Example use cases
IoT sensor drift detection
“I have a target configuration JSON for our HVAC unit and a live telemetry snapshot from the field. Can you diff them leaf-by-leaf and tell me which values are out of tolerance by more than 5% and which fields are missing entirely?”
Robot arm state audit
“Check whether our robot arm's observed joint angles and torque readings match the target state from the mission plan — use an absolute tolerance of 0.1 degrees on all angle fields under /joints/* and flag anything unexpected in the observed document.”
Firmware deployment validation
“After our firmware update, I need to verify the device's reported configuration matches the expected spec. Compare the target spec JSON against the device's reported state JSON, ignore anything under /diagnostics/*, and use exact equality for all string fields with case-insensitive comparison turned on.”
Technical details
Endpoint
POSThttps://agent.halowerk.com/v1/twin-diff?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a structured, tolerance-aware, leaf-level diff between two JSON state documents — especially in digital twin, IoT, or industrial automation contexts where numeric fields have defined acceptable ranges. It is preferable over generic JSON diff tools when you need per-field tolerance rules (absolute or ratio), path-based ignoring, and a clean enumerated status per leaf rather than a raw patch set.
Side effects
- Request rejected if combined leaf count of both documents exceeds max_fields (default 2000)
- Malformed or non-object target/observed inputs cause validation error
- Providing both tolerance_abs and tolerance_ratio for the same field is disallowed
- Field path strings exceeding 400 characters are rejected
- Payment of 0.003 USDC required via x402 protocol; failure to pay results in 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| target | object | The desired state document (the twin). |
| observed | object | The observed state document (the measurement). |
| max_fields | integer | Reject the request if the two documents together hold more leaf paths than this. |
| tolerances | array | Per-path tolerances. Give tolerance_abs or tolerance_ratio, not both. |
| ignore_fields | array | Paths to leave out of the comparison. A trailing /* ignores everything below that prefix. |
| default_tolerance_ratio | number | Relative tolerance for numeric paths without their own entry. 0 means exact equality. |
| case_insensitive_strings | boolean | Compare string leaves without regard to case. |
Tags
x402
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