# Economic Loop Detector

> Economic Loop Detector is a paid API for AI agents from phion.systems, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-23).

Detects self-referential and reciprocal transaction patterns in economic activity without falsely flagging correlated behavior as fraudulent

## Facts

- Endpoint: POST https://phion.systems/v1/paid/trust/economic-loop-detector?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/economic-loop-detector-c4e5867d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__tqd0D5zHbIs2N1_DKboa

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 economic-loop-detector-c4e5867d -d '<json body>'
```

Example prompt: Can you check these transaction records for self-dealing or reciprocal payment loops — I want to know if any agents are cycling money back to themselves, but without treating normal correlated activity as fraud?

## When to prefer this

Choose this endpoint when you need to identify economic loop patterns — such as self-transactions or reciprocal payment cycles — in agent or human transaction networks, especially when it is critical not to conflate statistical correlation with actual fraudulent looping. Prefer this over generic fraud-detection APIs when the use case involves multi-agent economies, autonomous payment systems, or audit trails where false positives on correlated transactions would be harmful.

## Known failure modes

- Empty or malformed transaction input returns a validation error
- Insufficient transaction history may yield low-confidence or no detected patterns
- Highly obfuscated loop structures with many intermediaries may be missed
- Ambiguous correlation vs. causation cases may produce inconclusive classifications

## How this service works

Detect self and reciprocal transaction patterns without treating correlation as fraud

## Output

Returns identified self-referential and reciprocal transaction patterns found in the input economic activity data, including confidence scores and pattern classifications, while distinguishing genuine loop structures from merely correlated but legitimate transactions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "additionalProperties": true
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "example"
   ],
   "properties": {
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/economic-loop-detector-c4e5867d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from phion.systems](https://www.zero.xyz/host/phion.systems/llms.txt)