Siliq SPC Analytics

x402

Siliq SPC Analytics is a paid API for AI agents from compute.siliq.io, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Computes Statistical Process Control metrics including control limits, Western Electric rule violations, and process capability indices (Cp, Cpk) for a data series.

Price / call$0.01

Seller volume →—

Success—

StatusDown

Output

Returns computed UCL/LCL control limits, a list of Western Electric rule violations with their indices, and process capability indices Cp and Cpk indicating whether the process is both stable and capable relative to specification limits.

Example use cases

Example prompt

“Run an SPC analysis on this dataset of 50 bottle-fill measurements (target 500ml, LSL 495ml, USL 505ml) — give me the control limits, flag any Western Electric rule violations, and calculate the Cp and Cpk.”

Technical details

Endpoint

POSThttps://compute.siliq.io/analytics/spc

When to prefer

Choose this endpoint when you need a complete SPC analysis bundle — control limits, Western Electric rule checks, and capability indices — in a single API call, rather than computing each separately. Ideal for quality engineers automating process monitoring pipelines or agents performing on-demand manufacturing quality assessments.

Side effects

Insufficient data points for reliable control limit calculation (too few samples)
Missing or invalid specification limits preventing Cp/Cpk calculation
Non-numeric or malformed data series returning a 400 validation error
Data with extreme outliers skewing control limit estimates
Payment failure via x402 protocol returning 402 status

Input

{
  "lsl": 45,
  "usl": 55,
  "data": [
    45.2,
    46.1,
    47.3,
    48.5,
    49.1,
    50.2,
    51,
    50.8,
    49.9,
    48.7,
    47.5,
    46.8,
    47.2,
    48.1,
    49.3,
    50.5,
    51.2,
    50.9,
    49.8,
    48.6,
    47.4,
    46.9,
    47.1,
    48,
    49.2,
    50.4,
    51.1,
    50.7,
    49.7,
    48.5
  ],
  "chartType": "xbar-r",
  "subgroupSize": 5
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "n": 30,
  "cp": 1.0078,
  "pp": 1.0078,
  "cpk": 0.7773,
  "lcl": 43.8954,
  "ppk": 0.7773,
  "ucl": 53.818,
  "sigma": 1.6538,
  "alerts": [],
  "centerline": 48.8567,
  "lcl_2sigma": 45.5491,
  "ucl_2sigma": 52.1642,
  "interpretation": "Process in control — no out-of-control signals detected. Cpk = 0.78 (not capable at 1.33 threshold).",
  "compute_time_ms": 1,
  "process_capable": false,
  "out_of_control_points": 0
}

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Technical details

Endpoint

POSThttps://compute.siliq.io/analytics/spc

When to prefer

Side effects

Insufficient data points for reliable control limit calculation (too few samples)
Missing or invalid specification limits preventing Cp/Cpk calculation
Non-numeric or malformed data series returning a 400 validation error
Data with extreme outliers skewing control limit estimates
Payment failure via x402 protocol returning 402 status

Input

{
  "lsl": 45,
  "usl": 55,
  "data": [
    45.2,
    46.1,
    47.3,
    48.5,
    49.1,
    50.2,
    51,
    50.8,
    49.9,
    48.7,
    47.5,
    46.8,
    47.2,
    48.1,
    49.3,
    50.5,
    51.2,
    50.9,
    49.8,
    48.6,
    47.4,
    46.9,
    47.1,
    48,
    49.2,
    50.4,
    51.1,
    50.7,
    49.7,
    48.5
  ],
  "chartType": "xbar-r",
  "subgroupSize": 5
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "n": 30,
  "cp": 1.0078,
  "pp": 1.0078,
  "cpk": 0.7773,
  "lcl": 43.8954,
  "ppk": 0.7773,
  "ucl": 53.818,
  "sigma": 1.6538,
  "alerts": [],
  "centerline": 48.8567,
  "lcl_2sigma": 45.5491,
  "ucl_2sigma": 52.1642,
  "interpretation": "Process in control — no out-of-control signals detected. Cpk = 0.78 (not capable at 1.33 threshold).",
  "compute_time_ms": 1,
  "process_capable": false,
  "out_of_control_points": 0
}