{"id":"711c1d39-cb49-4810-bb58-34d35579e7b6","shortId":"Enu2JM","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/45` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 endpoints are listed at the same $0.02/request price point.\n\nThe specific purpose of the `/api/v1/keys/45` endpoint is unclear from the available material — the description simply says \"Premium API Access\" with no further documentation, input schema, or example responses. There is no OpenAPI spec, no detailed docs, and the pricing/README pages require a wallet connection to view. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific function of /api/v1/keys/45 ('Premium API Access') is not explained anywhere in the crawled material","Pricing, README, and API doc pages require wallet connection and could not be crawled","No example request or response payloads are available","The platform lists many endpoints but none have detailed documentation visible without authentication"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/45","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/keys/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI spec, no documentation of request/response schemas, and the purpose of /api/v1/keys/45 specifically is undocumented. Pricing and README pages are behind a wallet-connect gate. This is effectively a stub 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'/request':19,38,168 '0.02':18,37,80,167 '000':84 '20':83 '402':226 '6':90 'Base network API' 'USDC API' 'access':75,190 'account':102 'advertis':123 'ai':12,31,134 'ai-inference' 'analysi':138 'analyt':128 'api':5,24,45,74,100,189 'attach':109 'avail':182 'base':8,27,63,85 'base-network' 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':126 'challeng':228 'classif':141 'confirm':221 'connect':215 'convers':158 'cost':77 'data':11,30,127,131 'data-analytics' 'decim':91 'descript':185 'detail':206 'difficult':236 'doc':207 'document':194,233 'embed':142 'enabl':44 'endpoint':16,35,57,67,125,161,177,219 'estim':152 'exampl':198 'exchang':147 'expect':247 'export':132 'feed':146 'financ':13,32,143 'finance-data' 'four':124 'gas':151 'generat':159 'geocod':156 'handl':94 'header':114 'infrastructur':154 'input':195 'insight':133 'key':101 'know':238 'lack':231 'learn':136 'list':71,163 'live':222 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':135 'make':234 'materi':183 'metric':129 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'openapi':203 'page':211 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payload':240 'payment':92,113,118 'per':3,22,55,81 'platform':6,25,46,122 'point':170 'premium':73,188 'premium API access' 'price':145,169 'pricing/readme':210 'proof':119 'proper':225 'protocol':98 'provid':48 'purpos':173 'quot':150 'rate':148 'report':130 'request':56 'requir':106,212 'respons':199,245 'return':223 'say':187 'schema':196 'send':242 'sentiment':137 'settl':58 'simpli':108,186 'spec':204 'specif':66,172 'subscript':104 'summar':140 'text':139 'token':149 'unclear':179 'unit':86 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,155 'utility-services' 'valid':117,157 'via':95 'view':217 'wallet':214 'web3':144 'wider':121 'x':112 'x-payment':111 'x402':43,97,227 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0ae6e965-a7a7-4e84-85db-c8d5f6241617","listingId":"711c1d39-cb49-4810-bb58-34d35579e7b6","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/keys/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.614Z"}],"sources":[{"listingId":"711c1d39-cb49-4810-bb58-34d35579e7b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.614Z","lastSeenAt":"2026-04-22T01:02:18.972Z"}],"details":{"listingId":"711c1d39-cb49-4810-bb58-34d35579e7b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/45 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/45"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/45"}],"useCases":["Accessing pay-per-request data analytics and reports without creating an account","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payment","Fetching real-time financial data and crypto gas estimates via micropayments","Using utility endpoints (geocoding, validation, conversion) on a pay-as-you-go basis"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime commitments","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.52Z"},"updatedAt":"2026-04-22T01:02:18.972Z"}}