{"id":"7994d603-05eb-43d7-a28d-a37276447ce5","shortId":"3YaNBV","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call notification endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" notification resource at `/api/v1/notifications/42`. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced uniformly at $0.02 per request and settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint probed (`/api/v1/notifications/42`) accepts POST requests and returns `application/json`. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment voucher for up to 20,000 base units of USDC (i.e., $0.02) on Base. No API keys, accounts, or rate limits are advertised — access is gated purely by micropayment.\n\nDocumentation beyond the landing-page catalog is essentially absent: the `/api`, `/pricing`, and `/README` routes all resolve to a wallet-connect stub with no further detail. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is confirmed live (402 challenge returned), but the actual behavior of the notifications resource — what it returns, what POST body it expects — is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-call","notification-api","no-api-key","json-response"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification endpoint","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown.","The /api, /pricing, and /README pages all resolve to a wallet-connect stub with no content.","The specific behavior of /api/v1/notifications/42 (what it does, what it returns) is not documented anywhere in the crawled material.","Endpoint purpose is unclear: 'Premium API Access' is a generic label shared across many endpoints on this platform."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/42","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing-page catalog, and the actual purpose of the /notifications/42 resource is unexplained. This is effectively a stub 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'/api/v1/notifications/42':45,96 '/pricing':160 '/readme':162 '/request':16,32 '0.02':15,31,77,130 '000':124 '20':123 '402':193 'Base network API' 'USDC pay-per-call' 'absent':157 'accept':97 'access':41,142 'account':136 'actual':198 'advertis':141 'ai/ml':65 'analyt':64 'api':40,60,134 'application/json':102 'attach':108 'avail':216 'base':8,24,86,125,132 'base-network' 'behavior':199 'beyond':149 'bodi':209 'broader':51 'call':4,20,59 'caller':107 'catalog':154 'challeng':194 'confirm':191 'connect':170 'contain':114 'data':63,69 'detail':175 'document':148 'dozen':54 'endpoint':6,22,34,61,94,189 'essenti':156 'exampl':187 'expect':211 'financ':67 'gate':144 'handl':105 'header':113 'i.e':129 'infer':66 'infrastructur':71 'inlin':106 'json-response' 'key':135 'land':152 'landing-pag':151 'limit':139 'live':192 'lowpaymentfee' 'lowpaymentfee.com':36 'materi':217 'micropay':147 'network':87 'no-api-key' 'notif':5,21,42,202 'notification endpoint' 'notification-api' 'offer':53 'openapi':179 'page':153 'part':48 'pay':2,18,57 'pay-per-cal':1,17,56 'pay-per-call' 'payment':103,112,118 'per':3,19,58,78 'platform':52 'post':98,208 'premium':39 'premium API access' 'price':74 'probe':95 'protocol':91 'provid':37 'pure':145 'rate':138 'request':79,99 'request/response':182 'resolv':165 'resourc':43,203 'return':101,195,206 'rout':163 'schema':183 'settl':11,27,81 'sign':116 'span':62 'spec':180 'specif':93 'stub':171 'uniform':75 'unit':126 'unknown':213 'usag':186 'usdc':13,29,83,128 'usdc-micropayment' 'util':72 'via':9,25,88 'voucher':119 'wallet':169 'wallet-connect':168 'web3':68 'x':111 'x-payment':110 'x402':10,26,90,117 'x402 micropayment API' 'x402-payment'","prices":[{"id":"112f7496-01a0-48b2-88fd-d09e39223fc1","listingId":"7994d603-05eb-43d7-a28d-a37276447ce5","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.112Z"}],"sources":[{"listingId":"7994d603-05eb-43d7-a28d-a37276447ce5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.112Z","lastSeenAt":"2026-04-22T04:02:46.575Z"}],"details":{"listingId":"7994d603-05eb-43d7-a28d-a37276447ce5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/42 \\\n  -H \"X-PAYMENT: <x402_payment_voucher>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (asset 0x8335…)","source_url":"https://lowpaymentfee.com/api/v1/notifications/42"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","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":["Triggering or retrieving notification data via a single micropayment call","Integrating pay-per-use notification services into agent workflows without API key management","Demonstrating x402 micropayment protocol usage on Base"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call notification access","x402 protocol experimentation on Base with low-cost USDC payments","Scenarios where no rate limits and no API keys are preferred"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integration","High-volume notification pipelines where $0.02/request adds up significantly","Anyone requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.424Z"},"updatedAt":"2026-04-22T04:02:46.575Z"}}