{"id":"abd1c3c4-032c-4ad8-bafe-c0fc3d0c3577","shortId":"Z4Xqat","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/54` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, infrastructure utilities, and notifications. Each call is settled on-chain via the x402 protocol on the Base network using USDC (contract `0x8335…2913`). The pricing is uniform across the platform at $0.02 per request (20,000 base units with 6 decimals = $0.02).\n\nThe specific endpoint being listed here is described only as \"Premium API Access\" with no further documentation on what the notification resource returns or what POST body it expects. The broader platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request. The x402 challenge confirms the endpoint is live, accepting POST requests, and discoverable.\n\nBecause the platform's `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional documentation, the actual request/response schema for this notifications endpoint is unknown. There is no OpenAPI spec, no example payloads, and no description of what notification ID 54 represents. Treat this as a low-documentation endpoint where the input and output formats must be discovered experimentally.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","notifications","post-endpoint","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["premium api access","notification api","pay-per-call api","x402 notification","lowpaymentfee","base usdc api","micropayment api"],"warnings":["No documentation exists for the /api/v1/notifications/54 endpoint — request and response schemas are completely unknown.","The platform's /api, /pricing, and /README pages all render only a 'Connect wallet' prompt with no useful content.","No OpenAPI or ai-plugin manifest is available.","The meaning of notification ID 54 is unexplained; it is unclear whether this is a fixed resource or a parameterized path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/54","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but there is zero documentation on what this notifications endpoint actually does, what request body it expects, or what it returns. No OpenAPI spec, no examples, and the site's docs pages are empty wallet-connect 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'/api/v1/notifications/54':34 '/pricing':169 '/readme':171 '0.02':11,26,88,98 '000':92 '0x8335':78 '20':91 '2913':79 '54':210 '6':96 'accept':159 'access':111,140 'across':84 'actual':186 'addit':183 'advertis':131 'ai/ml':54 'analyt':53 'api':50,110,133 'attach':143 'base':8,23,73,93 'base usdc api' 'base-network' 'bodi':125 'broader':129 'call':4,19,61 'chain':66 'challeng':153 'collect':44 'confirm':154 'connect':178 'contract':77 'data':52 'decim':97 'describ':106 'descript':205 'discov':228 'discover':163 'document':115,184,218 'endpoint':6,21,32,101,156,192,219 'exampl':201 'expect':127 'experiment':229 'financ':55 'format':225 'header':147 'id':209 'infrastructur':56 'input':222 'instant':139 'key':134 'limit':137 'list':103 'live':158 'low':217 'low-document':216 'lowpaymentfee' 'lowpaymentfee.com':39 'micropayment api' 'minim':177 'must':226 'network':74 'no-api-key' 'notif':5,20,59,119,191,208 'notification api' 'notifications' 'offer':42 'on-chain':64 'openapi':198 'output':224 'page':172 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request':46 'payload':202 'payment':146 'per':3,12,18,27,48,89 'per-request-billing' 'platform':40,86,130,166 'post':124,160 'post-endpoint' 'premium':109 'premium api access' 'price':81 'prompt':180 'protocol':70 'rate':136 'repres':211 'request':13,28,49,90,150,161 'request/response':187 'resolv':174 'resourc':120 'return':121 'schema':188 'settl':63 'simpli':142 'span':51 'spec':199 'specif':100 'treat':212 'uniform':83 'unit':94 'unknown':194 'usdc':15,30,76 'usdc-settlement' 'use':75 'util':57 'via':9,24,67 'wallet':179 'x402':10,25,69,145,152 'x402 notification' 'x402-payment'","prices":[{"id":"66752298-6629-4cba-9f46-180771ba15ea","listingId":"abd1c3c4-032c-4ad8-bafe-c0fc3d0c3577","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.189Z"}],"sources":[{"listingId":"abd1c3c4-032c-4ad8-bafe-c0fc3d0c3577","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.189Z","lastSeenAt":"2026-04-22T02:32:10.780Z"}],"details":{"listingId":"abd1c3c4-032c-4ad8-bafe-c0fc3d0c3577","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/54 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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 (= $0.02).","source_url":"https://lowpaymentfee.com/api/v1/notifications/54"},{"claim":"The platform advertises $0.02/request, no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/notifications/54"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Agent-driven workflows that need to trigger or read notification data with on-chain payment","Integrating low-cost notification services into automated pipelines on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go notification access","AI agents that can settle x402 payments autonomously on Base","Prototyping notification workflows without committing to a subscription"],"notFor":["High-volume notification use cases where per-call pricing adds up quickly","Users who need detailed API documentation and guaranteed SLAs before integrating","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.472Z"},"updatedAt":"2026-04-22T02:32:10.780Z"}}