# Japan Stablecoin Payment Monitor

> Japan Stablecoin Payment Monitor is a paid API for AI agents from open-pay.jp, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns a dated change feed of stablecoin payment service events in Japan, including new launches, pilots, partnerships, fee changes, supported assets/chains, and closures, filterable by date.

## Facts

- Endpoint: GET https://open-pay.jp/api/paid/usdc/stablecoin-payments
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/japan-stablecoin-payment-monitor-dd93ea71
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ha9xTWQxBmELPVTkxDmcY

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 japan-stablecoin-payment-monitor-dd93ea71
```

Example prompt: What stablecoin payment service changes happened in Japan since 2025-06-01 — any new launches, pilots, fee updates, or closures?

## When to prefer this

Use this endpoint when you need a structured, sourced, and dated audit trail of changes to Japan's stablecoin payment services landscape — especially in automated monitoring pipelines that run on a schedule and only need incremental updates via changedSince. Prefer this over general web search when you need machine-readable events with official source citations rather than news articles.

## Known failure modes

- Invalid changedSince date format (must match YYYY-MM-DD) returns a validation error
- limit out of range (>200 or <1) may return an error or be clamped
- No events found returns an empty changes list (not an error)
- Payment failure for the $0.01 USDC x402 fee results in a 402 response blocking access
- Service may return stale data if the weekly update has not yet run

## How this service works

Japan Stablecoin Payment Monitor: weekly change feed for stablecoin payment services in Japan — new launches, pilots, partnerships, fee changes, supported assets and chains, and closures. Each event is dated, categorized and tied to an official source URL. Pass changedSince=YYYY-MM-DD (your last run date) to fetch only new events; an empty changes list explicitly means no change. Without changedSince you get the full dated history back to late 2025.

## Output

A list of dated events describing changes in Japan's stablecoin payment ecosystem, each with an event category (launch, pilot, partnership, fee change, asset/chain addition, closure), the date of the event, and a source URL pointing to official documentation or announcements. If changedSince is provided and nothing changed, an explicit empty list is returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "string",
       "description": "1-200 (default 200). In delta mode the limit is rounded up to a date boundary: a single day is never split, so a day holding more events is returned whole. Continue with nextChangedSince while hasMore is true."
      },
      "changedSince": {
       "type": "string",
       "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
       "description": "Return only events on/after this date (YYYY-MM-DD). Set to your last run date. Omit for the full history."
      }
     },
     "additionalProperties": false
    }
   },
   "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/japan-stablecoin-payment-monitor-dd93ea71/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from open-pay.jp](https://www.zero.xyz/host/open-pay.jp/llms.txt)