●

longwatch

Data PAYMENT-READY

payment-ready until 2026-09-13

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, settled onchain via the x402 protocol, no signup, no API key needed.

measured since 2026-08-02 (start of our harvest window) · $0.12 all-time · settled via coinbase

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

VERDICT

ranking generation 3

solid 86/100 #89 of 265 in Data by measured score

What the score read on this service: status online, 100% uptime 30d, 1293ms response p95, x402 compliance 14 of 14, $0.001 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.

The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.

It is a score inside Data, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 265 listings, this one among them. That set is wider than the 265 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.

Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.

ALTERNATIVES IN DATA

Other Data services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).

Ranked alternative x402 services in the same category, with band, measured score, 30-day uptime and 30-day on-chain settlement volume
SERVICE	BAND	SCORE	UPTIME 30D	VOL 30D
Clink Forge	strong	98	98.5%	---
WhaleTape	strong	98	97.4%	---
ThirdMade Shelf	strong	98	100%	---
AgentToll	strong	98	100%	---
Japan Transit API	strong	97	99.1%	---

5 of 264 other ranked services in Data · see the whole category

ASSESSMENT

updated 1h ago

The parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.

reliability 100%

uptime 24h: 100%
uptime 7d: 100%
uptime 30d: 100%
uptime 90d: 100%
response p95: 1293ms
avg response: 710ms
total checks: 1,545

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 $0.001 to $0.005 (p10 in Data)

price (min): $0.001
price (max): $0.005
category percentile (min): p10 in Data
category percentile (max): p11 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: 31d
registrar: CloudFlare, Inc.
hosting: custom
domain created: 2026-08-02

Identity facts, not a risk score.

traction $0.001 30d · 1 buyers · top buyer 100%

volume 30d: $0.001
buyers 30d: 1
settlements 30d: 1
measured since: 2026-08-02 (start of our harvest window)
last settlement: 2026-08-17
top buyer share: 100% of 30d volume
trend 7d vs 30d: 0.00x the 30d daily rate
networks: eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time: $0.12
settlements all-time: 62
median settlement 30d: $0.001
max settlement 30d: $0.001
settled via: coinbase ($0.001, 1 tx)

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.

CHANGES

1 in 30d

Payout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.

changes schema changed 16d ago (1 in 30d)

schema changed · 16d ago

schema removed GET /check exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed POST /watches exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

see all changes for this service

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	USDC	header
POST	/watches		$0.005	Base	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
      }
    ],
    "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
      }
    ],
    "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

30d UPTIME 100%

RESPONSE TIME

AVG RESP 710ms

PRICE (captured 402, USD)

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

SUB-SCORES (uptime + x402 compliance)

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

PILLARS OVER TIME (measured)

price percentile in Data

site signals present (of 6)

Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.

VOLUME (on-chain settlement, USD)

DISTINCT BUYERS

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-08-21 · last up 2026-09-06

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 (18) live · click to expand

TIME STATUS RESP CAUSE

10:51:08 UTC ● OK 717ms

10:35:08 UTC ● SLOW 1106ms

10:19:09 UTC ● OK 1005ms

10:03:08 UTC ● OK 910ms

09:47:08 UTC ● OK 908ms

09:31:08 UTC ● OK 508ms

09:15:05 UTC ● OK 700ms

08:59:06 UTC ● OK 839ms

08:43:06 UTC ● OK 567ms

08:27:04 UTC ● OK 805ms

08:11:09 UTC ● OK 724ms

07:55:08 UTC ● OK 474ms

07:39:06 UTC ● OK 659ms

07:23:09 UTC ● OK 471ms

07:07:06 UTC ● OK 404ms

06:51:08 UTC ● OK 542ms

06:35:06 UTC ● OK 508ms

06:19:07 UTC ● OK 699ms

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.

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.