{"uid":"cap_dcZpWMkXb8KuxvjJVL_NO","slug":"trollbridge-site-watch-url-change-detection-104d1926","name":"TrollBridge Site-Watch – URL Change Detection","description":"The insurance booth for AI agents, with Mini's Agent Supply Store on the side of the road. One hundred checkpoints: pre-transaction safety lanes (honeypot, approval-risk, rug-score, receipt-check, tx-dryrun, permit-scan, airdrop-verdict, deployer-history, wallet-watch, secret-scan at $0.02 USDC per call; the protection tier — /contract-check, /approval-screen, /tx-plain-english, /honeypot-check, /tx-simulate, /redteam, /skill-scan, /verdict, /egress-audit, /tool-gate, /airlock, /repo-scan, /prove, /task-scope — at $0.10; the one-call /shield don't-get-rugged screen at $0.25; the full /preflight bundle at $0.05), bounty intel (bounties, fresh, verdicts, deadlines, sweepstakes, opportunities) at $0.02 USDC per call, trader intel (/prices and /quant at $0.02; /enrich and /token-check at $0.05; /contract-check and /honeypot-check at $0.10; /sec-facts at $0.05), market intel (/markets and /search at $0.05; /grants at $0.02), DeFi intel (/yields and /new-pairs at $0.05; /gas and /defi at $0.02), AI intel (/models at $0.02), agent-ops intel (/prompt-cost, /model-picks, /rpc-speed, /terms-tldr, /scrape, /gigs, /retry-verify, /idempotency, /verify-independent at $0.02; /site-watch, /wallet-check, /code-run, /regulatory-pack, /sage, /cron-watch, /caveat-check, /tripwire, /escrow, /trust, /bridge-fees, /dao-votes, /dev-activity, /dex-arb, /dydx-perps, /funding-rates, /gas-predict, /hack-tracker, /long-short-ratio, /lp-yields, /mev-scan, /open-interest, /perp-basis, /polymarket-odds, /rwa-watch, /sentiment, /stablecoin-flows, /tokenomics, /top-movers, /whale-watch, and /yield-stable at $0.05; /approval-screen, /tx-plain-english, /tx-simulate, and /task-scope at $0.10; /scam-scan deep scan at $5.00 or 30-day subscription at $30.00), supply store (/road-pack combo meal at $0.05; curated datasets, the /audit-prep pre-audit review, and the /prove-state symbolic-execution run at $1.00; the /audit AI-agent audit at $25.00). Every lane answers before money moves — heuristic verdicts, not audits. Don't get rugged.","url":"https://mini-tollbooth.onrender.com/site-watch?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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":["url"],"properties":{"url":{"type":"string","description":"URL to hash for change detection (http/https only)."},"prev_hash":{"type":"string","description":"Optional sha256 from a previous /site-watch call — returns whether it changed."},"prev_text":{"type":"string","description":"Optional previous page text — enables a diff snippet when the hash changed."},"prev_text_b64":{"type":"string","description":"Optional base64 of the previous page text (alternative to prev_text)."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"url":"https://example.com","hash":"a1082fcfb96e…","lane":"/site-watch","note":"…","changed":false,"description":"Change detection ($0.05) — sha256 fingerprint of any URL with a compact diff when it changes. Pass the hash back on the next call; stateless, nothing stored.","text_length":182}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Djvj-MfB9EZV4iUMXJToe","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches a URL, computes a SHA-256 hash of its content, and returns whether the page has changed since the last call, optionally including a diff snippet.","exampleAgentPrompt":"Check https://example.com/announcements for any changes since last time — here's the previous hash a1082fcfb96e so you can tell me if the page has changed.","exampleUseCases":[{"title":"Monitor competitor pricing page","prompt":"Watch https://competitor.com/pricing for me — compare it against this previous hash d3f1a29c77b2 and show me a diff snippet if anything changed."},{"title":"Track government grant deadline page","prompt":"Check https://grants.gov/opportunities/deadline-list for changes; here's the last page text I saved so you can show me exactly what's different if it's been updated."},{"title":"Detect smart contract documentation updates","prompt":"Has https://docs.uniswap.org/contracts/v4/overview changed since my last visit? The previous hash was 9f4a8e2b110c — just tell me yes or no and what's different."}],"resultDescription":"Returns a JSON object containing the URL checked, a SHA-256 hash of the current page content, a boolean 'changed' flag (present when a previous hash was supplied), an optional diff snippet when previous text was provided, the text length, and a lane description. The service is stateless — no data is stored server-side.","failureModes":["Non-HTTP/HTTPS URL provided — request rejected","Target URL is unreachable or returns an error — hash cannot be computed","prev_hash or prev_text mismatch format causes incorrect change comparison","Payment not completed (x402 flow) — endpoint returns 402 before processing","Target page blocks automated fetching (e.g. Cloudflare challenge) — content may be incomplete or empty"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, stateless, pay-per-call mechanism to detect whether a specific URL's content has changed, especially within an agent workflow where you want no server-side storage or subscription overhead. It is ideal for periodic polling loops, pre-transaction checks on protocol documentation, or any scenario where you need a compact SHA-256 fingerprint plus optional diff — all for a flat $0.05 USDC per call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:47:59.148Z","isFirstParty":false,"canonicalSlug":"trollbridge-site-watch-url-change-detection-104d1926"}