{"id":"89b973fe-4093-49e3-9daf-4c17b8979eaf","shortId":"fnnbbp","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/12`. 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 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/12`) accepts POST requests and returns `application/json`. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment for up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). No API keys or accounts are required — access is gated purely by micropayment. The platform advertises no rate limits and instant access.\n\nBecause this particular path (`/notifications/12`) is not described in the site's public API listing (which covers analytics, AI, finance, and utility categories), its exact functionality is unclear. The crawl material does not provide request/response schemas or documentation for notification endpoints specifically. The broader platform appears to be a demonstration or marketplace of low-fee x402-gated APIs, but details on what data or action the notifications endpoint returns are not available from the crawled content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response","post-method","notifications"],"categories":["infrastructure","notifications"],"synonyms":["x402 notification API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","402 payment endpoint"],"warnings":["The /api/v1/notifications/12 endpoint is not listed among the provider's publicly advertised APIs — its purpose is unknown.","No request body schema or response schema is documented anywhere in the crawled material.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.","Endpoint functionality is entirely opaque; callers cannot know what they are paying for without trial calls."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/12","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, and the specific /notifications/12 path is not listed on the provider's own site. Functionality must be entirely 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'/notifications/12':159 '/request':16,32 '0.02':15,31,75,127 '000':121 '20':120 '402 payment endpoint' '6':131 'Base network API' 'USDC pay-per-call' 'accept':95 'access':41,140,154 'account':137 'action':221 'advertis':148 'ai':173 'ai/ml':65 'analyt':64,172 'api':40,60,134,168,214 'appear':200 'application/json':100 'attach':106 'avail':228 'base':8,24,84,122 'base-network' 'broader':51,198 'call':4,20,59 'caller':105 'categori':177 'contain':112 'content':232 'cover':171 'crawl':184,231 'data':63,68,219 'decim':132 'demonstr':204 'describ':162 'detail':216 'document':192 'dozen':54 'endpoint':6,22,34,61,92,195,224 'exact':179 'fee':210 'financ':174 'finance/web3':67 'function':180 'gate':142,213 'handl':103 'header':111 'i.e':126 'infer':66 'infrastructur':70 'inlin':104 'instant':153 'json-response' 'key':135 'limit':151 'list':169 'low':209 'low-fe':208 'lowpaymentfee' 'lowpaymentfee.com':36 'marketplac':206 'materi':185 'micropay':145 'micropayment API' 'network':85 'no-api-key' 'notif':5,21,42,194,223 'notifications' 'offer':53 'part':48 'particular':157 'path':158 'pay':2,18,57 'pay-per-cal':1,17,56 'pay-per-call' 'payment':101,110,116 'per':3,19,58,76 'platform':52,147,199 'post':96 'post-method' 'premium':39 'premium API access' 'price':73 'probe':93 'protocol':89 'provid':37,188 'public':167 'pure':143 'rate':150 'request':77,97 'request/response':189 'requir':139 'resourc':43 'return':99,225 'schema':190 'settl':11,27,79 'sign':114 'sinc':128 'site':165 'span':62 'specif':91,196 'unclear':182 'unit':123 'usdc':13,29,81,125,129 'usdc-settlement' 'use':130 'util':71,176 'via':9,25,86 'x':109 'x-payment':108 'x402':10,26,88,115,212 'x402 notification API' 'x402-gated':211 'x402-payment'","prices":[{"id":"202ef391-7bf7-4d7c-a678-7ba18941fe79","listingId":"89b973fe-4093-49e3-9daf-4c17b8979eaf","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.939Z"}],"sources":[{"listingId":"89b973fe-4093-49e3-9daf-4c17b8979eaf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.939Z","lastSeenAt":"2026-04-22T02:32:10.426Z"}],"details":{"listingId":"89b973fe-4093-49e3-9daf-4c17b8979eaf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/12 \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\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 platform lists APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/notifications/12 requires maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/notifications/12"},{"claim":"USDC uses 6 decimals, so 20000 base units = $0.02.","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notification data via a single paid API call","Demonstrating x402 micropayment integration for agent-to-agent commerce","Accessing premium notification content without traditional API key signup"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC micropayments on Base","Use cases requiring keyless, per-call API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments","Anyone needing notification endpoints with well-documented schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.938Z"},"updatedAt":"2026-04-22T02:32:10.426Z"}}