x402 List

x402 Protocol Service Directory

●

x402donghang Agent APIs

Data PAYMENT-READY

payment-ready until 2026-08-20

Pay-per-call agent APIs led by live crypto narrative research: recent X and web evidence, CoinGecko market context, structured JSON, and source URLs. Also provides bilingual context briefs, summarization, and OpenAI-compatible chat. USDC via x402 on Base and Solana; no account or API key.

Pay from $0.01 to $0.03 per request in USDC on Base / Solana, settled onchain via the x402 protocol, no signup, no API key needed.

listed 2026-08-13 · no on-chain settlement recorded yet

BASE URL https://x402donghang.duckdns.org │ WEBSITE https://x402donghang.duckdns.org/x402/ │ ENDPOINTS 4 │ NETWORK Base / Solana │ ASSET USDC │ MEMBER SINCE 2026-08-13 │ MONITORED SINCE 2026-08-13

ASSESSMENT

updated 2h ago

Evidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.

reliability 100%
uptime 24h
-
uptime 7d
-
uptime 30d
-
uptime 90d
-
response p95
229ms
avg response
229ms
total checks
1

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

compliance A (14/14)

14 of 14 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.01 to $0.03 (p53 in Data)
price (min)
$0.01
price (max)
$0.03
category percentile (min)
p53 in Data
category percentile (max)
p50 in Data
endpoints / prices
4 / 2
model
tiered
stability
100%
risk clean

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

domain age
4870d
registrar
Gandi SAS
hosting
custom
domain created
2013-04-12

Identity facts, not a risk score.

traction $0.00 30d · 0 buyers
volume 30d
$0.00
buyers 30d
0
settlements 30d
0
first settlement
---
last settlement
---
top buyer share
-
trend 7d vs 30d
-
networks
eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time
$0
settlements all-time
0
median settlement 30d
-
max settlement 30d
-
settled via
-

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share is a concentration signal, not part of the ranking score.

WHAT IT DOES

ai-derived

No AI synthesis has been produced for this service yet.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD PATH DESCRIPTION PRICE NETWORK ASSET 402 CHANNEL
POST /x402/v1/chat/completions $0.01 Base/Solana USDC header
POST /x402/v1/crypto-brief $0.01 Base/Solana USDC header
POST /x402/v1/crypto-radar $0.03 Base/Solana USDC header
POST /x402/v1/summarize $0.01 Base/Solana USDC header
4 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to POST /x402/v1/chat/completions returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i -X POST 'https://x402donghang.duckdns.org/x402/v1/chat/completions'
// 402 response (captured by monitor) · 4 payloads · click to expand 
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x7F394b1E127CBCEA346979E552A4227328385B3d",
        "amount": "30000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "DzUgGWEzssF472WRZNEmMmnTxZRA9QCbYMeoQVYMdSN3",
        "amount": "30000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402donghang.duckdns.org/x402/v1/crypto-radar",
      "mimeType": "",
      "description": "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."
    },
    "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": {}
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x7F394b1E127CBCEA346979E552A4227328385B3d",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "DzUgGWEzssF472WRZNEmMmnTxZRA9QCbYMeoQVYMdSN3",
        "amount": "10000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402donghang.duckdns.org/x402/v1/summarize",
      "mimeType": "",
      "description": "Bilingual EN/ZH summary API for a public URL or raw text. Returns structured summary, key points, and actions. $0.01 USDC per call. Lightweight fetch, no headless browser."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "text": "这里是一段需要摘要的中文或英文正文……",
              "max_chars": 500
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "ok": true,
              "title": "标题（如有）",
              "source": {
                "type": "text",
                "chars_in": 1200
              },
              "actions": [
                "可执行动作1",
                "动作2",
                "动作3"
              ],
              "product": "summarize",
              "summary": "中文要点摘要……",
              "key_points": [
                "要点1",
                "要点2",
                "要点3"
              ]
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "type": "object",
                  "properties": {
                    "url": {
                      "type": "string",
                      "description": "Public http(s) URL to fetch and summarize (optional if text given)"
                    },
                    "text": {
                      "type": "string",
                      "description": "Raw text to summarize (optional if url given)"
                    },
                    "locale": {
                      "type": "string",
                      "description": "Default zh"
                    },
                    "max_chars": {
                      "type": "number",
                      "description": "Target summary length in Chinese chars, default 500, max 1200"
                    }
                  }
                },
                "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": {}
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x7F394b1E127CBCEA346979E552A4227328385B3d",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "DzUgGWEzssF472WRZNEmMmnTxZRA9QCbYMeoQVYMdSN3",
        "amount": "10000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402donghang.duckdns.org/x402/v1/chat/completions",
      "mimeType": "",
      "description": "Grok 4.5 High chat via x402. OpenAI-compatible /v1/chat/completions, streaming supported. Listed as grok-4.5-high. $0.01 USDC per request on Base/Solana mainnet. See GET /x402/v1/models for the full chat catalog."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "model": "grok-4.5-high",
              "stream": false,
              "messages": [
                {
                  "role": "user",
                  "content": "Hello"
                }
              ],
              "max_tokens": 256
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "id": "chatcmpl-x402",
              "model": "grok-4.5-high",
              "object": "chat.completion",
              "choices": [
                {
                  "index": 0,
                  "message": {
                    "role": "assistant",
                    "content": "Hello!"
                  },
                  "finish_reason": "stop"
                }
              ]
            }
          }
        },
        "schema": {
          "type": "object",
          "$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": [
                    "messages"
                  ],
                  "properties": {
                    "model": {
                      "type": "string",
                      "description": "Use \"grok-4.5-high\""
                    },
                    "stream": {
                      "type": "boolean"
                    },
                    "messages": {
                      "type": "array",
                      "items": {
                        "type": "object",
                        "required": [
                          "role",
                          "content"
                        ],
                        "properties": {
                          "role": {
                            "type": "string"
                          },
                          "content": {
                            "type": "string"
                          }
                        }
                      }
                    },
                    "max_tokens": {
                      "type": "number"
                    }
                  }
                },
                "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": {}
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x7F394b1E127CBCEA346979E552A4227328385B3d",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "DzUgGWEzssF472WRZNEmMmnTxZRA9QCbYMeoQVYMdSN3",
        "amount": "10000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402donghang.duckdns.org/x402/v1/crypto-brief",
      "mimeType": "",
      "description": "Bilingual EN/ZH crypto market brief as structured JSON for agents. Input symbol plus optional caller context. Output bias, thesis, evidence bullets, risks, invalidation, and actions. $0.01 USDC per call."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "locale": "zh",
              "symbol": "BTC",
              "context": "funding 转正，现货稳，合约多头拥挤"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "ok": true,
              "bias": "中性偏多",
              "risks": [
                "流动性抽离",
                "宏观突发"
              ],
              "symbol": "BTC",
              "thesis": "短线结构未破，但杠杆拥挤限制上行弹性。",
              "actions": [
                "轻仓观察",
                "避免追高"
              ],
              "bullets": [
                "现货支撑仍在",
                "资金费率偏贵",
                "等待回踩再加仓"
              ],
              "product": "crypto-brief",
              "confidence": 0.62,
              "disclaimer": "信息整理，非投资建议",
              "invalidation": "跌破关键支撑并放量"
            }
          }
        },
        "schema": {
          "type": "object",
          "$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 focus: spot | perp | macro | news"
                    },
                    "locale": {
                      "type": "string",
                      "description": "Default zh (Chinese brief)"
                    },
                    "symbol": {
                      "type": "string",
                      "description": "Ticker e.g. BTC / ETH / SOL / HYPE"
                    },
                    "context": {
                      "type": "string",
                      "description": "Optional market notes, news blurb, or on-chain snapshot (plain text)"
                    }
                  }
                },
                "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": {}
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 90d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/x402donghang-agent-apis/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.

UPTIME
08-13 · uptime 100.0% · 228ms avg08-1308-13
90d UPTIME 100%
RESPONSE TIME
08-13 · 228ms avg08-13 · 228ms avg08-1308-13
AVG RESP 253ms
PRICE (captured 402, USD)
building price history ($0.01)

Median across 4 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)
building assessment history (1 day so far)

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

VOLUME (on-chain settlement, USD)
building volume history (1 day so far)
DISTINCT BUYERS
building buyer history (1 day so far)

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-08-13 · last up 2026-08-13

  • 402 payload captured
  • accepts[] array present
  • payTo address recoverable
  • payTo at accepts[0].payTo (conformant shape)
  • payTo is a valid on-chain address
  • atomic price declared
  • atomic price in a sane range
  • asset (token) address declared
  • network resolves to CAIP-2
  • payment scheme declared
  • served over HTTPS
  • declares the current x402 version (2)
  • EIP-712 domain parameters present on every EVM entry
  • x402 v2 envelope delivered in the payment-required header

SITE PILLARS

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
recent checks (10) live · click to expand
TIME STATUS RESP CAUSE
● OK 214ms
● OK 272ms
● SLOW 448ms
● OK 193ms
● OK 190ms
● OK 360ms
● OK 213ms
● OK 88ms
● OK 325ms
● OK 229ms
10 of 10 checks · live count

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