# RQM Measure Phase Drift

> RQM Measure Phase Drift is a paid API for AI agents from jobs.rqmtechnologies.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Measures phase drift between a reference and observed complex signal sequence, returning a bounded pass/fail result with absolute and RMS drift metrics.

## Facts

- Endpoint: POST https://jobs.rqmtechnologies.com/x402/buyer-jobs/wave.measure-phase-drift.v1
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rqm-measure-phase-drift-9ec8cdd8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aNNKDa0nCWKirt_mBSl7X

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability rqm-measure-phase-drift-9ec8cdd8 -d '<json body>'
```

Example prompt: Check the phase drift between my reference signal and my observed signal — both are arrays of complex values up to 1024 samples — and tell me if it passes with a maximum absolute drift of 0.1 radians and a maximum RMS drift of 0.05 radians.

## When to prefer this

Choose this endpoint when you need a deterministic, bounded pass/fail result on phase drift between two complex signal arrays and want to gate or feed a downstream automated step. Prefer it over open-ended diagnostic tools (like RQM Phase Sensitive Inspection) when you already know your tolerances and need a simple accept/reject answer. Not suitable when you need hardware-level ground truth, continuous streaming analysis, causal diagnosis of why drift occurred, or unbounded real-time monitoring.

## Known failure modes

- Reference or observation arrays have fewer than 2 or more than 4096 items — returns validation error
- Drift threshold values exceed the maximum of ~201 radians — rejected by schema
- Complex value components outside the allowed [-1e12, 1e12] range — schema validation failure
- Mismatched array lengths between reference and observation — may return error or undefined behavior
- Insufficient USDC balance or max_total_price too low — payment rejected before execution
- Idempotency key format violation — request rejected

## How this service works

Measure Phase Drift: Measure phase drift in this bounded complex observation against the supplied reference and toler... Use when: The caller needs a bounded objective result that can directly gate or feed its next step. Returns: strict JSON summary, checksummed artifact manifest. Boundaries: Bounded deterministic local software evidence only; no physical, causal, regulatory, hardware, or perform...

## Output

Returns a bounded, objective measurement result including the computed absolute phase drift and RMS phase drift in radians, along with a pass/fail determination based on the supplied tolerance thresholds. The result can directly gate or feed the next step in an automated workflow.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "request": {
   "type": "object",
   "description": "Measure Phase Drift request metadata is discovery-only while execution is disabled.",
   "additionalProperties": true
  },
  "schema_version": {
   "const": "rqm.jobs.bazaar-buyer-job-request.v1"
  },
  "idempotency_key": {
   "type": "string",
   "pattern": "^[A-Za-z0-9][A-Za-z0-9._:-]*$",
   "maxLength": 128,
   "minLength": 1
  },
  "max_total_price": {
   "type": "string",
   "pattern": "^(?:0|[1-9]\\d{0,13})(?:\\.\\d{1,6})?$"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rqm-measure-phase-drift-9ec8cdd8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from jobs.rqmtechnologies.com](https://www.zero.xyz/host/jobs.rqmtechnologies.com/llms.txt)