{"id":"83c5013d-2c3d-4c8f-b9a8-38dcecc3ba95","shortId":"JFjMu8","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-67`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-67`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe x402 challenge was successfully captured (HTTP 402 with a well-formed accepts array), confirming the endpoint is live. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed feature description available for this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The path /api/endpoint-67 does not match any of the named endpoints listed on the lowpaymentfee.com landing page; its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README, /api) returned only a 'Connect wallet' stub with no usable content.","No request or response schema is available — callers cannot determine what input is expected or what output is returned.","The platform lists many endpoint categories (AI, finance, data, infrastructure) but provides no evidence that any of them return real data."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-67","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/endpoint-67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/endpoint-67 actually does — no input/output schema, no examples, and the path doesn't match any named endpoint on the landing page. Docs pages are empty 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'/docs':219 '/pricing':220 '/readme':221 '/request':168 '0.02':12,28,88,167 '000':83 '0x8335':73 '20':82 '2913':74 '402':204 '6':93 'Base network API' 'USDC micropayment endpoint' 'accept':64,210 'access':44,62 'across':125 'advertis':123 'ai':135 'analysi':139 'analyt':129 'api':6,22,42,61,96 'array':211 'attach':107 'avail':244 'base':9,25,52,76,84 'base-network' 'broader':120 'call':4,20 'caller':105 'captur':202 'categori':127 'challeng':199 'classif':142 'collect':36 'commit':102 'confirm':212 'connect':225 'content':231 'contract':72 'convers':159 'correspond':178 'cost':80 'crypto-paid API' 'data':128,132 'decim':94 'descript':243 'detail':241 'document':217,237 'embed':143 'endpoint':7,23,43,56,124,163,173,184,214,248 'equal':87 'estim':153 'exact':193 'exampl':239 'exchang':148 'export':133 'featur':242 'feed':147 'financ':144 'form':209 'four':126 'function':194 'gas':152 'generat':160 'geocod':157 'header':112 'host':34 'howev':170 'http':203 'infrastructur':155 'insight':134 'key':97 'label':59 'land':189 'learn':137 'limit':99 'list':162 'live':216 'lowpaymentfee' 'lowpaymentfee.com':33,121 'machin':136 'maximum':79 'metric':130 'name':183 'network':53 'no-api-key' 'page':190,218 'particular':172 'path':174 'pay':2,18,39 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':38 'payment':48,67,111,117 'per':3,13,19,29,40,89 'platform':122 'post':65 'post-endpoint' 'premium':5,21,60 'premium API access' 'price':146,169 'prompt':227 'proof':118 'protocol':49 'quot':151 'rate':98,149 'report':131 'request':14,30,41,66,90 'request/response':238 'requir':104 'return':222 'schema':236 'sentiment':138 'settl':69 'share':164 'simpli':106 'site':187 'specif':55,247 'substant':230 'success':201 'summar':141 'text':140 'token':150 'unclear':196 'unit':85 'upfront':101 'usdc':16,32,71,91 'usdc-settlement' 'use':92 'util':156 'valid':115,158 'via':10,26,45 'wallet':226 'web3':145 'well':208 'well-form':207 'x':110 'x-payment':109 'x402':11,27,47,116,198 'x402 API' 'x402-payment'","prices":[{"id":"43ed7dea-4ed5-4429-a780-c10d2953d55b","listingId":"83c5013d-2c3d-4c8f-b9a8-38dcecc3ba95","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/endpoint-67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:47.944Z"}],"sources":[{"listingId":"83c5013d-2c3d-4c8f-b9a8-38dcecc3ba95","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:47.944Z","lastSeenAt":"2026-04-23T00:31:03.800Z"}],"details":{"listingId":"83c5013d-2c3d-4c8f-b9a8-38dcecc3ba95","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/endpoint-67"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven API consumption where per-call USDC micropayments replace traditional API key subscriptions","Programmatic access to premium data or services without upfront registration","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402 protocol users settling in USDC on Base","Low-volume callers who prefer per-request billing over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:20:27.728Z"},"updatedAt":"2026-04-23T00:31:03.800Z"}}