# HALOWERK Corridor Re-entry Price Calculator

> HALOWERK Corridor Re-entry Price Calculator is a paid API for AI agents from handel.halowerk.com, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-17).

Calculates the re-entry price for a trade corridor given a previous price, floor, and ceiling constraints, returning a recommended price point.

## Facts

- Endpoint: POST https://handel.halowerk.com/v1/price/articles/corridor-reentry?utm_source=zero.xyz
- Price: $0.007/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-corridor-re-entry-price-calculator-178a314a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_E-2KYgxky87-UDScDI5jG

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 halowerk-corridor-re-entry-price-calculator-178a314a -d '<json body>'
```

Example prompt: Calculate the corridor re-entry price for the article at https://shop.example.com/item/42, given a previous price of 35.00 USD, a floor of 20.00, and a ceiling of 60.00.

## When to prefer this

Use this endpoint when you need a deterministic, paid corridor re-entry price computation for a specific article or product URL, particularly in automated repricing workflows where idempotency and floor/ceiling constraints are important. Prefer this over generic pricing APIs when you specifically need corridor-based re-entry logic with USDC micropayment billing on Base Mainnet.

## Known failure modes

- Missing or invalid previous price object (missing value or currency) returns a validation error
- Currency code not matching 3-letter ISO pattern causes schema rejection
- Floor price exceeding ceiling price may return an error or undefined behavior
- Idempotency key too short (under 32 chars) or containing invalid characters is rejected
- URL exceeds 2048 character limit and is rejected
- Payment not completed via x402 protocol results in 402 Payment Required

## How this service works

Notify when a previously out-of-range price returns inside a defined corridor. Uses an optional predicate extension of the proven Price-Callback motor. price_corridor_reentry_decision records this exact rule; the rule executes BEFORE dispatch. Same public IPv4HTTPS pinned connections, robots checks,9s,1MiBHTML,at-most-once receipt/idempotency7days,failureschargedfalse. Caller supplies historical price and schedules polling.

## Output

A JSON response containing the computed re-entry price recommendation for the specified corridor, factoring in the previous price, floor, and ceiling constraints. The result represents an actionable price point, not just an estimate.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "maxLength": 2048
  },
  "previous": {
   "type": "object",
   "required": [
    "value",
    "currency"
   ],
   "properties": {
    "value": {
     "type": "number",
     "maximum": 1000000000,
     "minimum": 0
    },
    "currency": {
     "type": "string",
     "pattern": "^[A-Z]{3}$"
    }
   },
   "additionalProperties": false
  },
  "floor_price": {
   "type": "number",
   "maximum": 1000000000,
   "minimum": 0
  },
  "callback_url": {
   "type": "string",
   "maxLength": 2048
  },
  "ceiling_price": {
   "type": "number",
   "maximum": 1000000000,
   "minimum": 0
  },
  "idempotency_key": {
   "type": "string",
   "pattern": "^[A-Za-z0-9_-]+$",
   "maxLength": 128,
   "minLength": 32
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-corridor-re-entry-price-calculator-178a314a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from handel.halowerk.com](https://www.zero.xyz/host/handel.halowerk.com/llms.txt)