# zaref.dev South African Reference Series Change Feed

> zaref.dev South African Reference Series Change Feed is a paid API for AI agents from zaref.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-23).

Returns which South African regulatory/statistical reference series have changed or been reconfirmed since a given date, enabling cache-freshness checks.

## Facts

- Endpoint: GET https://zaref.dev/v1/changes?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/zaref-dev-south-african-reference-series-change-feed-a4d5f6a6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aycjNcvSXTp22UvxvmXF0

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 zaref-dev-south-african-reference-series-change-feed-a4d5f6a6
```

Example prompt: Check which South African reference series on zaref.dev have changed or been reconfirmed since 2025-03-01 so I know what to refresh in my cache.

## When to prefer this

Use this endpoint before fetching individual South African reference data series to check which ones have actually changed since your last sync — it is the cheap cache-freshness signal that avoids unnecessary paid calls to individual data endpoints on zaref.dev.

## Known failure modes

- Missing or malformed 'since' parameter returns a 400 error
- Date in wrong format (not YYYY-MM-DD) causes a parse error
- Future date returns empty change list
- Payment not included or insufficient results in 402 Payment Required

## How this service works

Which South African reference series changed or were reconfirmed since a given date. The cheap cache-freshness check for agents. Optional param: since=YYYY-MM-DD (defaults to the last 30 days).

## Output

A list of South African reference series (e.g. CPI, SASSA grants, NCA rates, toll fees) that have either changed or been reconfirmed since the supplied date, allowing the agent to determine which cached data is stale and needs re-fetching.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "since": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/zaref-dev-south-african-reference-series-change-feed-a4d5f6a6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from zaref.dev](https://www.zero.xyz/host/zaref.dev/llms.txt)