{"id":"00171948-febd-48da-8964-a78ea6e7eafa","shortId":"R7HLGy","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/43` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are gated via the x402 payment protocol, settling in USDC on the Base network. The specific endpoint probed here is described as \"Premium API Access\" and accepts POST requests.\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). The platform advertises no API keys, no rate limits, no minimums, and instant access — you simply attach an x402 payment header to each call. The payment recipient address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nThe exact functionality behind this particular `/notifications/43` path is unclear from available documentation. The site groups its APIs into categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure) but does not list a notifications endpoint among them. There is no OpenAPI spec, no request/response schema documentation, and the crawled subpages (/api, /pricing, /README) returned only a wallet-connect prompt with no additional content. Treat this endpoint with caution until its input/output behavior is independently verified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","notifications","post-method"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","lowpaymentfee","x402 notification","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint.","The /notifications/43 path is not listed among the site's advertised API categories — its exact functionality is unknown.","Crawled /api, /pricing, and /README pages returned no useful content (only a wallet-connect prompt).","No example request or response bodies are available; input format must be discovered experimentally."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/43","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation of what the /notifications/43 endpoint actually does, and the crawled pages beyond the homepage were empty. This is effectively a stub 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'/api/v1/notifications/43':34 '/notifications/43':161 '/pricing':205 '/readme':206 '0.02':11,26,94,115 '000':105 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':152 '20':104 '6':112 'Base network API' 'USDC micropayment API' 'accept':89 'access':87,129 'addit':216 'address':143 'advertis':100,118 'ai':177 'ai/ml':55 'among':189 'analyt':54,176 'api':51,86,120,172 'asset':149 'attach':132 'avail':166 'base':8,23,75,106,154 'behavior':226 'behind':158 'broad':44 'call':4,19,139 'categori':174 'caution':222 'challeng':99 'connect':212 'content':217 'contract':150 'crawl':202 'data':53,175 'decim':113 'describ':83 'document':167,199 'endpoint':6,21,32,62,79,188,220 'equal':114 'exact':156 'financ':179 'finance/web3':57 'function':157 'gate':64 'group':170 'header':136 'independ':228 'infer':56 'infrastructur':59,181 'input/output':225 'instant':128 'key':121 'limit':124 'list':185 'lowpaymentfee' 'lowpaymentfee.com':39 'maxamountrequir':102 'minimum':126 'ml':178 'network':76 'notif':5,20,187 'notifications' 'offer':42 'openapi':194 'part':36 'particular':160 'path':162 'pay':2,17,48 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':47 'payment':68,135,141 'per':3,12,18,27,49,95 'platform':40,117 'post':90 'post-method' 'premium':85 'premium API access' 'price':92 'probe':80 'prompt':213 'protocol':69 'rate':123 'recipi':142 'request':13,28,50,91,96 'request/response':197 'return':207 'schema':198 'settl':70 'simpli':131 'site':169 'span':52 'spec':195 'specif':78 'subpag':203 'suit':45 'treat':218 'unclear':164 'unit':107 'usdc':15,30,72,109,148 'usdc-base' 'util':60 'verifi':229 'via':9,24,65 'wallet':211 'wallet-connect':210 'web3':180 'x402':10,25,67,98,134 'x402 notification' 'x402-payment'","prices":[{"id":"5510faf5-257e-4091-9244-d3cc48148372","listingId":"00171948-febd-48da-8964-a78ea6e7eafa","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.030Z"}],"sources":[{"listingId":"00171948-febd-48da-8964-a78ea6e7eafa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.030Z","lastSeenAt":"2026-04-22T04:02:46.477Z"}],"details":{"listingId":"00171948-febd-48da-8964-a78ea6e7eafa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/43 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/notifications/43"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, no minimums, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not list a notifications endpoint.","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Integrating low-cost per-request notification services into agent workflows","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers wanting keyless, pay-per-use API access","Agent systems that can settle USDC payments on Base automatically","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume notification use cases where per-call pricing adds up quickly","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.543Z"},"updatedAt":"2026-04-22T04:02:46.477Z"}}