x402donghang.duckdns.org

Name: x402donghang.duckdns.org
Price: 0.03 USDC
Availability: OutOfStock

Live crypto narrative and sentiment radar for AI agents. Searches recent X posts and the web, adds a verifiable CoinGecko market snapshot, and returns structured signals, risks, watch items, and source URLs. Input ticker + 1h/6h/24h/7d window. $0.03 USDC per call.

Searchoffline · HTTP 526eip155:8453Exactvia cdp

https://x402donghang.duckdns.org/x402/v1/crypto-radar

Calls · 30d

1→ 0%

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 18 snapshots so far.

$0.65

Verified settled volume

62 settlements proven x402 by their on-chain EIP-3009 marker.

$0.030

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-08-13 07:22Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0x7F394b1E127CBCEA346979E552A4227328385B3d

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "docs": "GET /x402/integrate for OpenAPI spec and client examples",
  "error": "payment_required",
  "message": "Attach an x402 payment header (Base or Solana USDC) OR use an API Key (Authorization: Bearer sk-x402-...).",
  "how_to_pay": [
    "0. API Key (no wallet needed): GET /x402/v1/apikey/balance to check your prepaid balance",
    "1. Free sample (no payment): /x402/v1/crypto-radar/sample",
    "2. Live catalog (prices + paths): GET /x402/v1/models",
    "3. Pay directly: sign the 402 PAYMENT-REQUIRED header with your wallet, resend with X-PAYMENT"
  ],
  "free_sample": "/x402/v1/crypto-radar/sample"
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.03USDC≈ $0.03 USD

on Base · exact scheme

Pay 0.03 USDC on Base to 0x7F39…85B3d. The signed payment is good for 5 minutes.

Paid to: 0x7F39…85B3d
USD Coin contract: 0x8335…02913
Payment window: 5 minutes
As published: 30000 smallest units

30000units

on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: DzUgGW…MdSN3
Token contract: EPjFWd…TDt1v
Payment window: 5 minutes

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x7F394b1E127CBCEA346979E552A4227328385B3d",
    "amount": "30000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
    },
    "payTo": "DzUgGWEzssF472WRZNEmMmnTxZRA9QCbYMeoQVYMdSN3",
    "amount": "30000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "focus": "ETF flows, regulation, exploits, exchange flows, and market-moving narratives",
          "locale": "en",
          "symbol": "BTC",
          "window": "6h"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "ok": true,
          "risks": [
            "A low-volatility range can break sharply in either direction."
          ],
          "market": {
            "provider": "CoinGecko",
            "price_usd": 63821,
            "change_24h_pct": 0.19
          },
          "symbol": "BTC",
          "window": "6h",
          "product": "crypto-radar",
          "signals": [],
          "sources": [
            {
              "url": "https://example.com/source",
              "type": "web",
              "title": "Source title"
            }
          ],
          "summary": "ETF-flow support is offset by cautious positioning and low volatility.",
          "sentiment": "mixed",
          "confidence": 0.74,
          "disclaimer": "Information only, not financial advice.",
          "narratives": [
            {
              "name": "ETF flows",
              "direction": "supportive",
              "evidence_urls": [
                "https://example.com/source"
              ]
            }
          ],
          "watch_next": [
            "Confirmed exchange-flow changes",
            "A break of the observed range"
          ],
          "observed_at": "2026-08-13T07:30:00.000Z",
          "source_count": 1,
          "sentiment_score": 0.12
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "symbol"
              ],
              "properties": {
                "focus": {
                  "type": "string",
                  "description": "Optional research focus, max 300 characters"
                },
                "locale": {
                  "enum": [
                    "en",
                    "zh"
                  ],
                  "type": "string",
                  "description": "Output language; default en"
                },
                "symbol": {
                  "type": "string",
                  "description": "Crypto ticker, e.g. BTC, ETH, SOL, HYPE, XRP, DOGE"
                },
                "window": {
                  "enum": [
                    "1h",
                    "6h",
                    "24h",
                    "7d"
                  ],
                  "type": "string",
                  "description": "Freshness window; default 6h"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  },
  "builder-code": {
    "info": {
      "s": [
        "cdp_sdk_server"
      ]
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "a": {
          "type": "string",
          "pattern": "^[a-z0-9_]{1,32}$",
          "description": "App builder code"
        },
        "s": {
          "type": "array",
          "items": {
            "type": "string",
            "pattern": "^[a-z0-9_]{1,32}$"
          },
          "maxItems": 11,
          "description": "Service builder codes"
        },
        "w": {
          "type": "string",
          "pattern": "^[a-z0-9_]{1,32}$",
          "description": "Wallet builder code"
        }
      },
      "additionalProperties": false
    }
  },
  "eip2612GasSponsoring": {},
  "erc20ApprovalGasSponsoring": {}
}

Provenance

Seen in the source catalog: 2026-08-13 07:22Z
Last indexed by Roundhouse: 2026-09-10 06:30Z
Last enriched (probe, favicon, geo): 2026-09-21 14:45Z
x402 version: 2
Max timeout: 300s
Liveness probe: HTTP 526

Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 18 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md

Show the prompt

Using Roundhouse, look up the x402 service x402donghang.duckdns.org and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=x402donghang.duckdns.org'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://x402donghang.duckdns.org/x402/v1/crypto-radar, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.