x402 List

x402 Protocol Service Directory

●

longwatch

Data PAYMENT-READY

payment-ready until 2026-08-27

Monitoring API for AI agents. Look up a page, RSS feed, crypto price, or SEC filings in one call ($0.001), or create a standing watch ($0.005) and poll for structured alerts since a cursor. Form 4 insider trades are parsed; 8-K item codes are decoded. Pay per call in USDC over x402 on Base and Solana — no API key or account. GET /demo is a free NVDA sample.

Pay from $0.001 to $0.005 per request in USDC on Base / Solana, settled onchain via the x402 protocol, no signup, no API key needed.

listed 2026-08-20 · no on-chain settlement recorded yet

BASE URL https://longwatch.dev │ WEBSITE https://longwatch.dev │ ENDPOINTS 2 │ NETWORK Base / Solana │ ASSET USDC │ MEMBER SINCE 2026-08-20 │ MONITORED SINCE 2026-08-20

ASSESSMENT

updated 3h 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
-
avg response
-
total checks
0

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

compliance unknown

x402 compliance not evaluated yet.

jump to compliance checklist

price $0.001 to $0.005 (p10 in Data)
price (min)
$0.001
price (max)
$0.005
category percentile (min)
p10 in Data
category percentile (max)
p12 in Data
endpoints / prices
2 / 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
17d
registrar
CloudFlare, Inc.
hosting
custom
domain created
2026-08-02

Identity facts, not a risk score.

traction $0.00 30d · 0 buyers
volume 30d
$0.00
buyers 30d
0
settlements 30d
0
measured since
--- (start of our harvest window)
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
GET /check $0.001 Base/Solana USDC header
POST /watches $0.005 Base/Solana USDC header
2 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to GET /check returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i 'https://longwatch.dev/check'
// 402 response (captured by monitor) · 2 payloads · click to expand 
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x8CB34360d7BB93D4386384D549D69ecE30F1aB48",
        "amount": "1000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"
        },
        "payTo": "HaT4P67h3EDcxLjQMRucX8przKL7J7VYRj6RdH4j8VS2",
        "amount": "1000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://longwatch.dev/check",
      "tags": [
        "monitoring",
        "alerts",
        "change-detection",
        "website monitoring",
        "page diff",
        "sec-filings",
        "edgar",
        "insider trading",
        "form 4",
        "rss",
        "price-alerts",
        "web-monitoring",
        "mcp"
      ],
      "iconUrl": "https://longwatch.dev/icon.svg",
      "mimeType": "",
      "description": "This-session snapshot only — no watch, no cursor. Use when you will not come back. Types: url, rss, price, edgar (8-K items decoded, Form 4 trades parsed). If the job spans runs, create_watch instead and persist watch_id + key.",
      "serviceName": "longwatch"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "type": "edgar",
              "forms": [
                "8-K",
                "4"
              ],
              "ticker": "NVDA"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "type": "edgar",
              "watch": {
                "body": {
                  "type": "edgar",
                  "forms": [
                    "8-K",
                    "4"
                  ],
                  "ticker": "NVDA"
                },
                "create": "POST /watches"
              },
              "result": {
                "company": "NVIDIA CORP",
                "filings": [
                  {
                    "form": "4",
                    "summary": "CFO bought 10,000 shares"
                  }
                ]
              }
            }
          }
        },
        "schema": {
          "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",
                  "required": [
                    "type"
                  ],
                  "properties": {
                    "cik": {
                      "type": "number",
                      "description": "edgar: SEC CIK, alternative to ticker"
                    },
                    "url": {
                      "type": "string",
                      "description": "url|rss: page or feed URL to watch"
                    },
                    "coin": {
                      "type": "string",
                      "description": "price: CoinGecko id, e.g. bitcoin"
                    },
                    "type": {
                      "enum": [
                        "url",
                        "rss",
                        "price",
                        "edgar"
                      ],
                      "type": "string",
                      "description": "watch type"
                    },
                    "above": {
                      "type": "number",
                      "description": "price: alert when USD price crosses above"
                    },
                    "below": {
                      "type": "number",
                      "description": "price: alert when USD price crosses below"
                    },
                    "forms": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      },
                      "description": "edgar: form filter, e.g. [\"8-K\",\"4\"]"
                    },
                    "ticker": {
                      "type": "string",
                      "description": "edgar: stock ticker"
                    },
                    "move_pct_24h": {
                      "type": "number",
                      "description": "price: alert when abs 24h change exceeds this pct"
                    }
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      },
      "eip2612GasSponsoring": {},
      "erc20ApprovalGasSponsoring": {}
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x8CB34360d7BB93D4386384D549D69ecE30F1aB48",
        "amount": "5000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"
        },
        "payTo": "HaT4P67h3EDcxLjQMRucX8przKL7J7VYRj6RdH4j8VS2",
        "amount": "5000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://longwatch.dev/watches",
      "tags": [
        "monitoring",
        "alerts",
        "change-detection",
        "website monitoring",
        "page diff",
        "sec-filings",
        "edgar",
        "insider trading",
        "form 4",
        "rss",
        "price-alerts",
        "web-monitoring",
        "mcp"
      ],
      "iconUrl": "https://longwatch.dev/icon.svg",
      "mimeType": "",
      "description": "Keep watching a source between agent runs. Persist watch_id and key; later poll_alerts with since=<last cursor> returns only what you missed. Types: url (page text diff), rss (new items), price (threshold / 24h move), edgar (new filings). Create includes the baseline so the next poll is not empty. The first check's baseline is included in the response. Poll GET /watches/{id}/alerts?since={cursor}&key={key} for later alerts.",
      "serviceName": "longwatch"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "type": "edgar",
              "forms": [
                "8-K"
              ],
              "ticker": "NVDA"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "key": "kq3…",
              "type": "edgar",
              "poll_url": "https://longwatch.dev/watches/5b2e…/alerts?since=0&key=kq3…",
              "watch_id": "5b2e…"
            }
          }
        },
        "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": {
                  "required": [
                    "type"
                  ],
                  "properties": {
                    "cik": {
                      "type": "number",
                      "description": "edgar: SEC CIK, alternative to ticker"
                    },
                    "url": {
                      "type": "string",
                      "description": "url|rss: page or feed URL to watch"
                    },
                    "coin": {
                      "type": "string",
                      "description": "price: CoinGecko id, e.g. bitcoin"
                    },
                    "type": {
                      "enum": [
                        "url",
                        "rss",
                        "price",
                        "edgar"
                      ],
                      "type": "string",
                      "description": "watch type"
                    },
                    "above": {
                      "type": "number",
                      "description": "price: alert when USD price crosses above"
                    },
                    "below": {
                      "type": "number",
                      "description": "price: alert when USD price crosses below"
                    },
                    "forms": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      },
                      "description": "edgar: form filter, e.g. [\"8-K\",\"4\"]"
                    },
                    "ticker": {
                      "type": "string",
                      "description": "edgar: stock ticker"
                    },
                    "webhook": {
                      "type": "object",
                      "required": [
                        "url"
                      ],
                      "properties": {
                        "url": {
                          "type": "string",
                          "description": "https endpoint that alerts are POSTed to"
                        }
                      },
                      "description": "optional: push alerts to this URL as they occur, instead of only polling"
                    },
                    "move_pct_24h": {
                      "type": "number",
                      "description": "price: alert when abs 24h change exceeds this pct"
                    }
                  }
                },
                "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"
                }
              }
            }
          }
        }
      },
      "eip2612GasSponsoring": {},
      "erc20ApprovalGasSponsoring": {}
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/longwatch/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
08-20 · uptime 100.0% · 593ms avg08-2008-20
30d UPTIME 100%
RESPONSE TIME
08-20 · 593ms avg08-20 · 593ms avg08-2008-20
AVG RESP 598ms
PRICE (captured 402, USD)
building price history ($0.003)

Median across 2 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)
building assessment history

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

VOLUME (on-chain settlement, USD)
no on-chain volume yet
DISTINCT BUYERS
no distinct buyers yet

COMPLIANCE

not evaluated

last 402 captured 2026-08-20 · last up 2026-08-20

  • 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 (14) live · click to expand
TIME STATUS RESP CAUSE
● OK 628ms
● OK 777ms
● OK 730ms
● OK 308ms
● OK 635ms
● OK 791ms
● OK 550ms
● OK 777ms
● OK 301ms
● OK 527ms
● OK 424ms
● OK 700ms
● OK 588ms
● OK 636ms
14 of 14 checks · live count

EMBED THIS BADGE

Show that longwatch is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

longwatch listed on x402-list
status
longwatch uptime on x402-list
live uptime
// HTML
<a href="https://x402-list.com/services/longwatch?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/longwatch.svg" alt="longwatch listed on x402-list" height="28">
</a>
// Markdown
[![longwatch on x402-list](https://x402-list.com/badge/longwatch.svg)](https://x402-list.com/services/longwatch?utm_source=badge&utm_medium=referral&utm_campaign=embed)
// HTML · live uptime variant
<a href="https://x402-list.com/services/longwatch?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/longwatch.svg?data=uptime" alt="longwatch uptime on x402-list" height="28">
</a>

RUN THIS SERVICE?

Keep this listing accurate: propose changes to the name, description, website, category or add new endpoints to monitor. Ownership is verified with a domain proof and every change is reviewed manually; measured data stays read-only.

[ update this listing ]

Earn the verified tier: x402list pays a real call to this endpoint and, if it delivers, the service is delivery-verified. The fee covers the cost of the probe, not the badge; there is no refund if the call does not deliver. Agent and API only, no in-browser signing. See /api.

[ verify this service ($0.25) ]

To request delisting, email info@x402-list.com or update your listing at /services/longwatch/update.