longwatch
Managed change detection for public web pages, RSS feeds, crypto price thresholds, and SEC filings. Retrieve unseen alerts by cursor through MCP or REST; a watch includes 7 days of polling.
TradingLiveeip155:8453Exactvia cdp
MonitoringAlertsChange-detectionWebsite monitoringPage diff
Calls · 30d
2↑ 56%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$0.13
Verified settled volume
64 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-09-17 03:52Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x8CB34360d7BB93D4386384D549D69ecE30F1aB48The 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": "https://longwatch.dev/",
"hint": "Pay $0.001 USDC via x402 (Base); the full payment requirements are in the PAYMENT-REQUIRED header. No API key or account is needed.",
"error": "payment_required",
"price": "$0.001 USDC",
"retry": {
"url": "https://longwatch.dev/check?type=edgar&ticker=NVDA&forms=8-K%2C4",
"method": "GET"
},
"networks": [
"base"
],
"input_example": {
"type": "edgar",
"forms": [
"8-K",
"4"
],
"ticker": "NVDA"
},
"required_input": [
"type"
],
"free_alternative": "GET https://longwatch.dev/demo for a free NVDA Form 4 sample, or POST https://longwatch.dev/try for a 24h watch — no wallet needed.",
"agentcash_command": "npx agentcash@latest fetch 'https://longwatch.dev/check?type=edgar&ticker=NVDA&forms=8-K%2C4'",
"valid_input_shapes": [
{
"type": "url",
"required": [
"type",
"url"
]
},
{
"type": "rss",
"required": [
"type",
"url"
]
},
{
"type": "price",
"required": [
"type",
"coin"
],
"require_one_of": [
"above",
"below",
"move_pct_24h"
]
},
{
"type": "edgar",
"required": [
"type"
],
"require_one_of": [
"ticker",
"cik"
]
},
{
"type": "x402",
"required": [
"type",
"url"
]
}
]
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.001USDC≈ $0.001 USD
on Base · exact scheme
Pay 0.001 USDC on Base to 0x8CB3…1aB48. The signed payment is good for 5 minutes.
- Paid to
- 0x8CB3…1aB48
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 1000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x8CB34360d7BB93D4386384D549D69ecE30F1aB48",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"type": "edgar",
"forms": [
"8-K",
"4"
],
"ticker": "NVDA"
}
},
"output": {
"type": "json",
"example": {
"type": "edgar",
"watch": {
"body": {
"type": "edgar",
"forms": [
"8-K",
"4"
],
"ticker": "NVDA"
},
"create": "POST /watches"
},
"result": {
"company": "NVIDIA CORP",
"filings": [
{
"form": "4",
"summary": "CFO bought 10,000 shares"
}
]
}
}
}
},
"schema": {
"type": "object",
"$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",
"oneOf": [
{
"title": "Web page",
"required": [
"type",
"url"
],
"properties": {
"type": {
"const": "url"
}
}
},
{
"title": "RSS feed",
"required": [
"type",
"url"
],
"properties": {
"type": {
"const": "rss"
}
}
},
{
"anyOf": [
{
"required": [
"above"
]
},
{
"required": [
"below"
]
},
{
"required": [
"move_pct_24h"
]
}
],
"title": "Crypto price",
"required": [
"type",
"coin"
],
"properties": {
"type": {
"const": "price"
}
}
},
{
"anyOf": [
{
"required": [
"ticker"
]
},
{
"required": [
"cik"
]
}
],
"title": "SEC EDGAR filings",
"required": [
"type"
],
"properties": {
"type": {
"const": "edgar"
}
}
},
{
"title": "x402 endpoint",
"required": [
"type",
"url"
],
"properties": {
"type": {
"const": "x402"
}
}
}
],
"required": [
"type"
],
"properties": {
"cik": {
"type": "number",
"description": "edgar: SEC CIK, alternative to ticker"
},
"url": {
"type": "string",
"description": "url|rss|x402: public page, feed, or payment endpoint URL"
},
"body": {
"type": "object",
"description": "x402: optional qualified JSON request body",
"additionalProperties": true
},
"coin": {
"type": "string",
"description": "price: CoinGecko id, e.g. bitcoin"
},
"type": {
"enum": [
"url",
"rss",
"price",
"edgar",
"x402"
],
"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\"]"
},
"method": {
"enum": [
"GET",
"POST",
"PUT",
"PATCH",
"DELETE",
"HEAD"
],
"type": "string",
"description": "x402: unpaid probe method"
},
"ticker": {
"type": "string",
"description": "edgar: stock ticker"
},
"move_pct_24h": {
"type": "number",
"description": "price: alert when abs 24h change exceeds this pct"
},
"expected_scheme": {
"type": "string",
"description": "x402: optional expected scheme, e.g. exact"
},
"expected_network": {
"type": "string",
"description": "x402: optional expected CAIP-2 network, e.g. eip155:8453"
},
"expected_amount_atomic": {
"type": "string",
"description": "x402: optional expected token amount in atomic units"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"eip2612GasSponsoring": {},
"erc20ApprovalGasSponsoring": {}
}Provenance
- Seen in the source catalog
- 2026-09-17 03:52Z
- Last indexed by Roundhouse
- 2026-09-24 10:00Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 21:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
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. 30 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service longwatch 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=longwatch' 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://longwatch.dev/check, 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.