# Whaletape x402 Merchant Measurement History

> Whaletape x402 Merchant Measurement History is a paid API for AI agents from whaletape.xyz, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns per-purchase measurement history for a specific x402 merchant, including settlement state, transaction ID, latency, advertised price, and actual price charged.

## Facts

- Endpoint: GET https://whaletape.xyz/index/merchant/:id
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/whaletape-x402-merchant-measurement-history-452e86a1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_32Kj1YUhYZQ3Efr61V89e

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 whaletape-x402-merchant-measurement-history-452e86a1
```

Example prompt: Pull the full measurement history for x402 merchant abc123 — I want to see every purchase, whether it settled, the settlement txid, how long it took, and whether the price charged matched what was advertised.

## When to prefer this

Use this endpoint when you need granular, per-transaction audit data for a specific x402 merchant — including settlement confirmation, on-chain txid, pricing accuracy, and latency. Prefer this over the aggregate settlement-rate ranking endpoint when you need the full purchase-level detail rather than a summary score.

## Known failure modes

- Merchant ID not found — returns empty or 404-style response
- Merchant has no recorded purchases yet — returns empty array
- Invalid merchant ID format — returns error
- Upstream data unavailable — intermittent service errors possible at $0.02/call cost

## How this service works

Measurement history for one x402 merchant: state, settlement txid, latency, advertised price and price actually charged, purchase by purchase

## Output

A list of per-purchase measurement records for the specified x402 merchant, each containing: settlement state (e.g. settled or failed), settlement transaction ID, end-to-end latency, advertised price at time of purchase, and the price actually charged. Records cover the merchant's full measurement history ordered by purchase.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/whaletape-x402-merchant-measurement-history-452e86a1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whaletape.xyz](https://www.zero.xyz/host/whaletape.xyz/llms.txt)