# Orders of Magnitude NS Index Range Lookup

> Orders of Magnitude NS Index Range Lookup is a paid API for AI agents from x402-api-production-5133.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Retrieves a range of entries from a namespace index, enabling ordered data retrieval by input key or range specifier

## Facts

- Endpoint: GET https://x402-api-production-5133.up.railway.app/ns/index/range
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/orders-of-magnitude-ns-index-range-lookup-87027f3e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GikesuAo6V7vBH0Vc7NOT

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 orders-of-magnitude-ns-index-range-lookup-87027f3e
```

Example prompt: Can you fetch a range of entries from the namespace index using the key 'products:2024' so I can see what's stored there?

## When to prefer this

Use this endpoint when you need to retrieve an ordered range or slice of entries from a namespace index rather than a single point lookup; ideal for paginated access or scanning ordered data sets stored under namespace keys.

## Known failure modes

- Missing required 'input' parameter returns validation error
- Input key does not match any namespace entries, returning empty result
- Malformed input string causes lookup failure
- Payment not fulfilled via x402 protocol results in 402 response
- Service unavailable on Railway deployment returns 5xx error

## How this service works

Data and AI services via x402 payment protocol

## Output

Returns an object containing a range of namespace index entries matching the provided input key or range specifier; specific fields depend on what is stored in the namespace index.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/orders-of-magnitude-ns-index-range-lookup-87027f3e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-api-production-5133.up.railway.app](https://www.zero.xyz/host/x402-api-production-5133.up.railway.app/llms.txt)