{"id":"e9e5900d-03e9-4005-9971-6fde531eaaa2","shortId":"yKHBjd","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/notifications/83` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific endpoint listed here is described as \"Premium API Access\" and sits under a notifications path, though no further documentation clarifies what notification data or functionality it provides.\n\nPricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC, which at 6 decimals equals $0.02). There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header with each request. The endpoint accepts POST requests and returns application/json responses. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the canonical USDC contract (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nThe platform's landing page lists many sibling endpoints (analytics, AI, finance, infrastructure utilities) all at the same $0.02 price point, but no OpenAPI schema, request/response examples, or detailed documentation is available for any of them, including this notifications endpoint. The exact payload format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","notifications","json-response","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification API","x402 notification","lowpaymentfee notifications","pay-per-call notification","Base USDC API"],"warnings":["No documentation available for this specific endpoint — the purpose of /api/v1/notifications/83 is unclear","No OpenAPI or schema describing request body or response format","The /pricing, /api, and /README pages all returned only a 'Connect wallet' prompt with no useful content","The endpoint path includes a hardcoded ID (83) with no explanation of what it references"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/83","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/notifications/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the notifications/83 path is entirely opaque. Effectively a stub 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'0.02':11,26,106,127,192 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':173 '20':116 '6':124 'Base USDC API' 'accept':152 'access':85 'address':164 'advertis':112 'ai':184 'ai/ml':54 'analyt':53,183 'api':50,84,131 'application/json':157 'attach':142 'avail':205 'base':8,23,73,118,167 'call':4,19 'caller':140 'canon':170 'challeng':111 'clarifi':96 'collect':44 'commit':139 'contract':172 'crypto':57 'data':52,99 'decim':125 'describ':81 'detail':202 'document':95,203 'endpoint':6,21,32,62,77,151,182,213 'equal':126 'exact':215 'exampl':200 'financ':56,185 'format':217 'function':101 'header':146 'includ':210 'infer':55 'infrastructur':186 'json-response' 'key':132 'land':177 'limit':135 'list':78,179 'lowpaymentfee notifications' 'lowpaymentfee.com':39 'mani':180 'maxamountrequir':114 'minimum':138 'network':74 'no-api-key' 'notif':5,20,90,98,212 'notification API' 'notifications' 'offer':42 'openapi':197 'page':178 'part':36 'path':91 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call notification' 'pay-per-request':46 'payload':216 'payment':66,145,160 'per':3,12,18,27,48,107 'platform':40,175 'point':194 'post':153 'premium':83 'premium API access' 'price':104,193 'protocol':67 'provid':103 'rate':134 'request':13,28,49,108,149,154 'request/response':199 'respons':158,219 'return':156 'schema':198 'sent':162 'servic':60 'settl':68 'sibl':181 'simpli':141 'sit':87 'span':51 'specif':76 'structur':220 'though':92 'unit':119 'unknown':222 'usdc':15,30,70,121,171 'usdc-base' 'use':63,168 'util':59,187 'via':9,24 'x402':10,25,65,110,144 'x402 notification' 'x402-payment'","prices":[{"id":"be3db499-6efb-43ef-aaca-1310a0d014ca","listingId":"e9e5900d-03e9-4005-9971-6fde531eaaa2","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/notifications/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.008Z"}],"sources":[{"listingId":"e9e5900d-03e9-4005-9971-6fde531eaaa2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.008Z","lastSeenAt":"2026-04-22T04:02:46.457Z"}],"details":{"listingId":"e9e5900d-03e9-4005-9971-6fde531eaaa2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/83 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/83"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/83"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving notification data via a single paid API call","Integrating pay-per-use notification access into agent workflows","Accessing premium notification content without API key management"],"bestFor":["Agents that need keyless, pay-per-call API access on Base","Developers testing x402 payment flows with low-cost endpoints","Scenarios requiring no-commitment, no-rate-limit notification retrieval"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.639Z"},"updatedAt":"2026-04-22T04:02:46.457Z"}}