# Delx Null Distribution

> Delx Null Distribution is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Measures the distribution of null and missing fields across an array of JSON records, returning per-field null counts and rates.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/null-distribution
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-null-distribution-c3237f33
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RZKDpBihE9x9AFas1rmUT

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 delx-null-distribution-c3237f33 -d '<json body>'
```

Example prompt: Can you check this batch of customer records for null and missing fields and tell me which fields have the highest null rates before I send them to the enrichment pipeline?

## When to prefer this

Choose this endpoint when you need a fast, stateless, deterministic null-field profile of a bounded set of JSON records as a preflight step before downstream data processing, policy evaluation, or integration workflows. Prefer it over custom code when you need a consistent machine-readable output with per-field null rates at low cost ($0.003 USDC) without retaining input data.

## Known failure modes

- Empty records array returns zero-count distribution or validation error
- Malformed JSON input returns a parsing error
- Non-object array elements may cause field extraction to fail or return partial results
- Very large record arrays may hit payload size limits
- Missing required 'records' field returns a schema validation error

## How this service works

Measure null and missing-field distribution across JSON records. Use it as a bounded preflight or analysis step inside an enterprise agent workflow before data, policy, integration, security, or commercial decisions reach production. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, memory-only, and has no paid upstream or input retention. Results are advisory; the caller remains responsible for authorization and produ…

## Output

A machine-readable JSON object containing per-field null counts, null rates (as fractions or percentages), total record count, and a summary of field coverage across the submitted records array. Results are deterministic and stateless.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "records": {
   "type": "array",
   "description": "Input field: records."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "fields": {
   "id": {
    "percent": 0,
    "null_or_missing": 0
   },
   "score": {
    "percent": 50,
    "null_or_missing": 1
   }
  },
  "schema": "delx/util-null-distribution/v1",
  "record_count": 2
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-null-distribution-c3237f33/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)