longwatch
Poll a watch for alerts since a cursor. Pass since={last seq you saw}; the response carries a new cursor. Polling keeps the watch alive.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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 $0.005 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": "$0.005 USDC",
"retry": {
"url": "https://longwatch.dev/watches/5b2e0f1a-%E2%80%A6/alerts?since=0&key=kq3%E2%80%A6",
"method": "GET"
},
"networks": [
"base"
],
"input_example": {
"key": "kq3…",
"since": 0
},
"required_input": [
"key"
],
"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/watches/5b2e0f1a-%E2%80%A6/alerts?since=0&key=kq3%E2%80%A6'"
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
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
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
- HaT4P6…j8VS2
- Token contract
- EPjFWd…TDt1v
- Payment window
- 5 minutes
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x8CB34360d7BB93D4386384D549D69ecE30F1aB48",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
},
"payTo": "HaT4P67h3EDcxLjQMRucX8przKL7J7VYRj6RdH4j8VS2",
"amount": "1000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"pathParams": {
"id": "309f9910-0a44-417d-b5d2-26df1a2c222f"
},
"queryParams": {
"key": "kq3…",
"since": 0
}
},
"output": {
"type": "json",
"example": {
"alerts": [
{
"seq": 7,
"form": "8-K",
"kind": "filing"
}
],
"cursor": 7,
"status": "active",
"watch_id": "5b2e…"
}
}
},
"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"
},
"pathParams": {
"type": "object",
"required": [
"id"
],
"properties": {
"id": {
"type": "string",
"description": "watch_id returned by POST /watches"
}
}
},
"queryParams": {
"type": "object",
"required": [
"key"
],
"properties": {
"key": {
"type": "string",
"description": "watch key returned at creation"
},
"since": {
"type": "number",
"description": "cursor: highest alert seq already seen (0 on first poll)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
},
"routeTemplate": "/watches/:id/alerts"
},
"eip2612GasSponsoring": {},
"erc20ApprovalGasSponsoring": {}
}Provenance
- Seen in the source catalog
- 2026-08-04 20:19Z
- Last indexed by Roundhouse
- 2026-09-03 17:20Z
- Last enriched (probe, favicon, geo)
- 2026-09-13 16:45Z
- 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. 10 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/watches/:id/alerts, 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.