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Sentinel402 RCP/1 Retrieval Server
x402
Sentinel402 RCP/1 Retrieval Server is a paid API for AI agents from pii-guardrail.chronokey.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-12).
Retrieves live, citable data (crypto prices, weather, GitHub activity, sports scores, FX rates, Hacker News, Wikipedia, stocks, news, geolocation, npm/pypi packages, ENS names) via sparse-mode RCP/1 protocol, paid per-call over x402.
Price / call$0.003
Success—
StatusUnknown
How this service works
Paid tools for AI agents over x402: a PII and secret guardrail that scans outbound payloads, live citable data (crypto, weather, GitHub, sports, FX), and an RCP/1 retrieval server backed by that live data.
Output
A JSON-RPC 2.0 response containing a `result.hits` array, each hit having an `id`, `text` (human-readable sentence with the data), `score`, `meta` (structured fields like priceUsd, symbol, kind), and a `citation` object with `uri` and `title`. The `_meta` object includes query routing details, collection name, upstream source, freshness in seconds, and routing confidence score.
Example use cases
Live crypto price lookup for trading bot
“Get me the current price of ETH in USD with a citation — use sparse mode and return the top 3 hits from the crypto collection.”
Real-time weather for travel planning
“What's the weather right now in Tokyo? Give me up to 5 results using sparse mode so I have citable data to share.”
GitHub commit activity monitoring
“Pull the latest commits from the vercel/next.js GitHub repo — sparse mode, top 10 results — so I can summarize recent activity.”
Technical details
Endpoint
POSThttps://pii-guardrail.chronokey.workers.dev/rcp/retrieve?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need live, citable, structured data across a broad set of domains (crypto, weather, FX, sports, GitHub, news, wiki, stocks, geo, packages, ENS) in a single unified RCP/1 interface with per-call micropayment via x402. Prefer it over domain-specific APIs when you want citation URIs alongside data, when you need routing across multiple data types from one call, or when you are building an agent that pays per query rather than managing multiple API keys.
Side effects
- Query routed to wrong collection if natural-language parsing is ambiguous (low routingConfidence)
- dense or hybrid mode requested returns error -32005 (only sparse is supported)
- Payment not attached or invalid x402 token returns 402 Payment Required
- k out of range (must be 1-50) returns validation error
- Upstream data source (Binance, weather API, etc.) unavailable causes stale or missing hits
- Unknown collection enum value causes schema validation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"id": 1,
"result": {
"hits": [
{
"id": "crypto:BTC",
"meta": {
"kind": "crypto.price",
"symbol": "BTC",
"priceUsd": 84621.74
},
"text": "Bitcoin (BTC) is trading at $84,621.74 USD, 24h +1.83%. Source: Binance BTCUSDT.",
"score": 1,
"citation": {
"uri": "https://www.binance.com/en/trade/BTCUSDT",
"title": "Bitcoin price"
}
}
],
"_meta": {
"query": "what is the btc price",
"returned": 1,
"routedBy": "query-parse",
"upstream": "api.binance.com / api.coinbase.com",
"fromCache": false,
"collection": "crypto",
"freshnessSeconds": 30,
"routingConfidence": 0.9
}
},
"jsonrpc": "2.0"
}
}Tags
x402
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