{"uid":"cap_lR6QDyDMqWzLfmGD1fcNi","slug":"halowerk-price-change-callback-monitor-d1f33b9e","name":"HALOWERK Price Change Callback Monitor","description":"HALOWERK handelswerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.","url":"https://handel.halowerk.com/v1/price-change-callback?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType"],"properties":{"type":{"const":"http"},"method":{"const":"POST"},"bodyType":{"const":"json"},"schemaUrl":{"type":"string","format":"uri"},"exampleUrl":{"type":"string","format":"uri"}},"additionalProperties":true},"output":{"type":"object","required":["type"],"properties":{"type":{"const":"json"},"schemaUrl":{"type":"string","format":"uri"},"exampleUrl":{"type":"string","format":"uri"}},"additionalProperties":true}},"additionalProperties":true},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.006","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":"$0.006/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_1-HMxVNih28WoVBGWqPC4","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.006","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Registers a callback URL to be notified when a webpage's displayed price changes by a specified amount or direction","exampleAgentPrompt":"Watch https://shop.example.com/product/widget for any price decrease from the current price of 49.99 USD, with a minimum change of 2.00, and call back my webhook at https://myapp.example.com/price-alert when it happens.","exampleUseCases":[{"title":"Competitor price drop alert","prompt":"Monitor https://competitor.com/product/running-shoes for any price decrease from the current 89.99 USD — if it drops by at least 5.00 send a POST to https://mystore.example.com/hooks/price-drop so I can respond with a promotion."},{"title":"Supplier price increase warning","prompt":"Keep an eye on https://supplier.example.com/materials/steel-sheet where the price is currently 320.00 USD and alert my system at https://erp.mycompany.com/webhooks/price-change if it increases at all, even by a small amount."},{"title":"Consumer deal tracker","prompt":"Watch the product page at https://electronics-store.com/tv-model-x for any price change from the current 749.99 USD in any direction, minimum change of 10.00, and notify https://dealalerts.myapp.com/callback when it happens."}],"resultDescription":"An acknowledgment that the price watch has been registered. When the monitored page's price changes in the specified direction by at least the minimum threshold, the provided callback_url receives a POST notification with the detected price change details.","failureModes":["Target URL is unreachable or returns non-200 status — monitoring cannot be established","Price element not found or parseable on the target page — returns error indicating price extraction failure","Callback URL is invalid or unreachable — notification delivery fails silently or returns error","Idempotency key format invalid (must be 32-128 alphanumeric/dash/underscore chars) — 400 validation error","Currency code not in ISO 4217 three-letter format — 400 validation error","Previous value or minimum_change exceeds maximum of 1,000,000,000 — 400 validation error","Payment not provided or insufficient USDC balance — 402 Payment Required"],"whenToPreferThis":"Use this endpoint when you need asynchronous, webhook-driven notification of price changes on a specific web page, rather than polling repeatedly yourself. It is ideal when you want to react to price movements in a specific direction (increase, decrease, or any) above a configurable minimum threshold, without building your own scraping and monitoring infrastructure. Prefer this over general web scraping endpoints when the goal is specifically price surveillance with callback delivery.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T06:59:57.338Z","isFirstParty":false,"canonicalSlug":"halowerk-price-change-callback-monitor-d1f33b9e"}