{"id":"69bed819-c646-4318-8a13-7e028eec74b7","shortId":"MRYGhG","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/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-97`) is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per request. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader 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 (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, `/api/endpoint-97` does not map to any of these named endpoints, so its exact functionality is unclear — the description simply says \"Premium API Access\" with no further documentation.\n\nNo OpenAPI schema, request/response examples, or detailed documentation were found. The docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does or what request format it expects, callers will need to experiment or contact the provider for guidance.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["Endpoint functionality is completely undocumented — 'Premium API Access' is the only description available","No OpenAPI schema or request/response format documented","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no content","/api/endpoint-97 does not correspond to any of the named endpoints listed on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-97","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-97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of /api/endpoint-97 is completely undocumented. The docs pages are empty. This is effectively a stub 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'/request':13,28,160 '0.02':12,27,88,159 '000':82 '20':81 'Base network API' 'USDC API' 'accept':63 'access':42,61,185 'across':118 'actual':223 'advertis':98,116 'ai':128 'analysi':132 'analyt':122 'api':5,20,40,60,92,184,203 'attach':101 'base':8,23,50,67,83 'broader':114 'call':4,19 'caller':99,231 'categori':120 'challeng':70 'classif':135 'collect':34 'confirm':71 'connect':211 'contact':237 'content':217 'convers':151 'data':121,125 'descript':180 'detail':196 'doc':201 'document':189,197 'embed':136 'endpoint':41,54,73,117,155,172,222 'estim':146 'exact':175 'exampl':194 'exchang':141 'expect':230 'experi':235 'export':126 'feed':140 'financ':137 'format':228 'found':199 'four':119 'function':176 'gas':145 'generat':152 'geocod':149 'guidanc':241 'header':106 'host':32 'howev':162 'http-post' 'i.e':87 'infrastructur':148 'insight':127 'key':93 'know':219 'learn':130 'limit':96 'list':57,154 'live':75 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':129 'map':166 'maximum':79 'metric':123 'micropayment API' 'name':171 'need':233 'network':9,24,51 'no-api-key' 'openapi':191 'page':206 'pay':2,17,37 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':36 'payment':46,65,105,111 'per':3,18,38,89 'platform':6,21,115 'premium':59,183 'price':139,161,202 'prompt':213 'proof':112 'protocol':47 'provid':239 'quot':144 'rate':95,142 'readm':205 'report':124 'request':39,90,227 'request/response':193 'requir':77 'return':208 'say':182 'schema':192 'sentiment':131 'share':156 'simpli':100,181 'specif':53 'substant':216 'summar':134 'text':133 'token':143 'unclear':178 'unit':84 'usdc':15,30,64,86 'usdc-base' 'valid':109,150 'via':10,25,43 'wallet':212 'web3':138 'without':218 'x':104 'x-payment':103 'x402':11,26,45,69,110 'x402 API' 'x402-payment'","prices":[{"id":"d2b3cf90-d56f-4cab-afaa-371adbf1786b","listingId":"69bed819-c646-4318-8a13-7e028eec74b7","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-97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:15.535Z"}],"sources":[{"listingId":"69bed819-c646-4318-8a13-7e028eec74b7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:15.535Z","lastSeenAt":"2026-04-24T08:02:34.129Z"}],"details":{"listingId":"69bed819-c646-4318-8a13-7e028eec74b7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-97 \\\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 of USDC (USD Coin, 6 decimals) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/endpoint-97"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an unspecified premium API service via x402 micropayments","Agent-driven API consumption without pre-registration or API keys","Paying per request in USDC on Base for on-demand data or compute"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Exploring micropayment-gated API services"],"notFor":["Users who need documented request/response schemas before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone needing a specific, well-documented capability (endpoint purpose is unclear)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.466Z"},"updatedAt":"2026-04-24T08:02:34.129Z"}}