dev.coinop/longwatch

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

You are ephemeral; this remembers. Persist watch_id+key; poll later for what you missed.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "longwatch": {
      "url": "https://longwatch.dev/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (18)

• check_now

  This-session snapshot only — no watch, no cursor. Use when you will not come back. Required by type: url/rss/x402 need url; price needs coin plus above, below, or move_pct_24h; edgar needs ticker or cik. 8-K items are decoded, Form 4 trades parsed, and x402 probes validate the unpaid 402 challenge without sending payment. If the job spans runs, create_watch instead and persist watch_id + key. Costs $0.001 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • type (required) — string — source type
  • cik — number — edgar: SEC CIK, as an alternative to ticker
  • url — string — url|rss|x402: public URL
  • body — object
  • coin — string — price: CoinGecko id, e.g. 'bitcoin'
  • above — number — price: threshold to compare against
  • below — number — price: threshold to compare against
  • forms — array — edgar: form filter, e.g. ["8-K","4"]
  • method — string
  • ticker — string — edgar: stock ticker, e.g. 'NVDA'
  • move_pct_24h — number — price: 24h move threshold to compare against
  • expected_scheme — string
  • expected_network — string
  • expected_amount_atomic — ['string', 'number']

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• create_watch

  Keep watching a source between agent runs and alert when it changes. Persist watch_id and key; later poll_alerts with since=<last cursor> returns only what you missed. Required by type: url/rss/x402 need url; price needs coin plus a threshold; edgar needs ticker or cik. Create includes the baseline and 7 days of polling. Costs $0.005 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • type (required) — string — watch type
  • cik — number — edgar: SEC CIK, as an alternative to ticker
  • url — string — url|rss|x402: public URL to watch
  • body — object
  • coin — string — price: CoinGecko id, e.g. 'bitcoin'
  • above — number — price: alert when USD price crosses above this
  • below — number — price: alert when USD price crosses below this
  • forms — array — edgar: form filter, e.g. ["8-K","4"]
  • method — string
  • ticker — string — edgar: stock ticker, e.g. 'NVDA'
  • webhook — object — optional: POST alerts to this URL as they occur (signed); polling still works
  • move_pct_24h — number — price: alert when |24h change| exceeds this percent
  • expected_scheme — string
  • idempotency_key — string — unique retry key; the same key and input return the original watch without charging twice
  • expected_network — string
  • expected_amount_atomic — ['string', 'number']

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• check_web_page

  Fetch a public web page now and return normalized text metadata. Use for a one-session lookup. Costs $0.001 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • url (required) — string — public http(s) page URL

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• watch_web_page

  Monitor a public web page between agent runs and alert with added and removed text when it changes. Includes 7 days of polling. Costs $0.005 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • url (required) — string — public http(s) page URL
  • webhook — object — optional HTTPS endpoint for signed push alerts; polling still works
  • idempotency_key — string — unique retry key; the same key and input return the original watch

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• check_rss_feed

  Read the latest items from a public RSS or Atom feed now. Use for a one-session lookup. Costs $0.001 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • url (required) — string — public RSS or Atom feed URL

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• watch_rss_feed

  Monitor an RSS or Atom feed between agent runs and alert once per new item. Includes 7 days of polling. Costs $0.005 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • url (required) — string — public RSS or Atom feed URL
  • webhook — object — optional HTTPS endpoint for signed push alerts; polling still works
  • idempotency_key — string — unique retry key; the same key and input return the original watch

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• check_crypto_price

  Check a CoinGecko asset price and whether it currently meets a USD threshold or 24-hour move condition. Costs $0.001 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • coin (required) — string — CoinGecko id, e.g. bitcoin
  • above — number
  • below — number
  • move_pct_24h — number

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• watch_crypto_price

  Monitor a crypto price between agent runs and alert once when it crosses a threshold, with hysteresis before re-arming. Includes 7 days of polling. Costs $0.005 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • coin (required) — string — CoinGecko id, e.g. bitcoin
  • above — number
  • below — number
  • webhook — object — optional HTTPS endpoint for signed push alerts; polling still works
  • move_pct_24h — number
  • idempotency_key — string — unique retry key; the same key and input return the original watch

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• check_sec_filings

  Get recent SEC filings for a ticker or CIK now, with decoded 8-K items and parsed Form 4 transactions. Costs $0.001 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • cik — number
  • forms — array
  • ticker — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• watch_sec_filings

  Monitor a company between agent runs for new SEC filings, decoded 8-K events, and parsed Form 4 trades. Includes 7 days of polling. Costs $0.005 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • cik — number
  • forms — array
  • ticker — string
  • webhook — object — optional HTTPS endpoint for signed push alerts; polling still works
  • idempotency_key — string — unique retry key; the same key and input return the original watch

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• check_insider_trades

  Get recent Form 4 insider transactions for a ticker or CIK, parsed into buyer/seller, shares, value, transaction type, and 10b5-1 status. Costs $0.001 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • cik — number
  • ticker — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• watch_insider_trades

  Monitor a company between agent runs for new Form 4 insider buys, sells, grants, and tax withholding. Includes 7 days of polling. Costs $0.005 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • cik — number
  • ticker — string
  • webhook — object — optional HTTPS endpoint for signed push alerts; polling still works
  • idempotency_key — string — unique retry key; the same key and input return the original watch

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• check_x402_endpoint

  Send an unpaid request and validate the endpoint's HTTP 402 challenge, accepted networks, scheme, amount, and recipient. The target probe does not attach payment. Costs $0.001 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • url (required) — string
  • body — object
  • method — string
  • expected_scheme — string
  • expected_network — string
  • expected_amount_atomic — ['string', 'number']

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• watch_x402_endpoint

  Monitor an x402 endpoint for downtime and changes to its payment challenge, price, network, scheme, or recipient. Target probes do not attach payment. Includes 7 days of polling. Costs $0.005 USDC per call via x402 (Base) — no API key, no account. Calling without payment returns 402 with the payment requirements. 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.

  Parameters:

  • url (required) — string
  • body — object
  • method — string
  • webhook — object — optional HTTPS endpoint for signed push alerts; polling still works
  • expected_scheme — string
  • idempotency_key — string — unique retry key; the same key and input return the original watch
  • expected_network — string
  • expected_amount_atomic — ['string', 'number']

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• poll_alerts

  What is new since your last run. Pass since={last seq you saw}; the response carries a new cursor. New paid watches include 7 days of polling. After that window, one $0.005 paid poll renews the next 7 days. Polling keeps the watch alive; beta watches remain free. Free through the watch's included polling window; after that, one $0.005 USDC x402 payment renews 7 days. No API key or account.

  Parameters:

  • watch_id (required) — string — watch_id returned by create_watch
  • key (required) — string — key returned by create_watch
  • since — number — highest alert seq already seen; 0 on first poll

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• try_watch

  Create a free trial watch — no payment, no wallet, no account. Same watch types as create_watch (url, rss, price, edgar, x402). The trial runs for 24h, one at a time per caller, and cannot use webhooks. Use this first to see what the alerts look like before paying. Free — no payment required.

  Parameters:

  • type (required) — string — watch type
  • cik — number — edgar: SEC CIK, as an alternative to ticker
  • url — string — url|rss|x402: public URL to watch
  • body — object
  • coin — string — price: CoinGecko id, e.g. 'bitcoin'
  • above — number — price: alert when USD price crosses above this
  • below — number — price: alert when USD price crosses below this
  • forms — array — edgar: form filter, e.g. ["8-K","4"]
  • method — string
  • ticker — string — edgar: stock ticker, e.g. 'NVDA'
  • move_pct_24h — number — price: alert when |24h change| exceeds this percent
  • expected_scheme — string
  • expected_network — string
  • expected_amount_atomic — ['string', 'number']

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• poll_trial

  Poll a trial watch created by try_watch. Free. Pass since={last seq you saw}; the response carries a new cursor. Once the trial expires, create a paid watch with create_watch; paid creation includes 7 days of polling and can be renewed. Free — no payment required.

  Parameters:

  • watch_id (required) — string — watch_id returned by try_watch
  • key (required) — string — key returned by try_watch
  • since — number — highest alert seq already seen; 0 on first poll

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• delete_watch

  Stop and delete a watch. Free. Free — no payment required.

  Parameters:

  • watch_id (required) — string — watch_id to delete
  • key (required) — string — key returned by create_watch

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

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