{"id":"9a61818a-bfbf-4f7a-a533-84e01d7c5dab","shortId":"DLEFF8","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/54` 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 — callers attach an `X-PAYMENT` header with a signed payment proof, and the server fulfills the request without traditional API keys or subscriptions.\n\nThe 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 per request price point. The site claims no API keys, no rate limits, no minimums, and instant access.\n\nNote that the specific endpoint probed (`/api/v1/keys/54`) does not clearly map to any of the named API categories on the landing page. Its purpose beyond \"Premium API Access\" is undocumented. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. The actual behavior of this endpoint and the data it returns remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment required"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/keys/54 path does not correspond to any named endpoint on the landing page — its actual functionality is unknown","Docs, pricing, and README pages all resolve to a minimal 'Connect wallet' page with no useful content","No request or response examples available — callers cannot know what payload to send or what to expect back"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/54","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/54","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), but there is no OpenAPI schema, no request/response examples, and the docs/pricing/README pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/keys/54 is undocumented. Effectively a stub 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'/request':19,38 '0.02':18,37,80,169 '000':84 '20':83 '402 payment required' '6':90 'access':75,187,215 'actual':246 'addit':243 'advertis':125 'ai':12,31,136 'ai-inference' 'analysi':140 'analyt':130 'api':5,24,45,74,119,178,204,214 'attach':100 'base':8,27,63,85 'base network api' 'behavior':247 'beyond':212 'broad':50 'call':4,23,82 'caller':99 'catalog':51 'categori':128,205 'claim':176 'classif':143 'classification' 'clear':197 'connect':238 'content':244 'convers':160 'cost':77 'cover':10,29 'crypto api access' 'crypto-quotes' 'data':11,30,129,133,253 'data-analytics' 'decim':91 'doc':228 'embed':144 'embeddings' 'enabl':44 'endpoint':16,35,57,67,127,163,192,250 'estim':154 'exampl':225 'exchang':149 'export':134 'feed':148 'financ':13,32,145 'finance-data' 'four':126 'fulfil':114 'gas':153 'generat':161 'geocod':158 'geocoding' 'handl':94 'header':105 'infrastructur':156 'insight':135 'instant':186 'key':120,179 'land':208 'learn':138 'limit':182 'list':71,165 'low payment fee' 'lowpaymentfee.com':39 'machin':137 'map':198 'metric':131 'micropayment api' 'minim':237 'minimum':184 'name':203 'network':64 'note':188 'offer':48 'openapi':221 'page':209,232 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,104,109 'per':3,22,55,81,170 'platform':6,25,46,124 'point':173 'premium':73,213 'price':147,172,229 'probe':193 'prompt':240 'proof':110 'protocol':98 'purpos':211 'quot':152 'rate':150,181 'readm':231 'remain':256 'report':132 'request':56,116,171 'request/response':224 'resolv':234 'return':255 'schema':222 'sentiment':139 'sentiment-analysis' 'server':113 'settl':58 'sign':108 'site':175 'specif':66,191 'subscript':122 'summar':142 'text':141 'text-summarization' 'token':151 'tradit':118 'undocu':217 'unit':86 'unknown':257 'usdc':9,28,60,88 'usdc api' 'usdc-base-settlement' 'util':15,34,157 'utility-apis' 'valid':159 'via':95 'wallet':239 'web3':146 'without':117 'x':103 'x-payment':102 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4f94688d-48fa-4e7a-a747-c9e15441e5e1","listingId":"9a61818a-bfbf-4f7a-a533-84e01d7c5dab","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.560Z"}],"sources":[{"listingId":"9a61818a-bfbf-4f7a-a533-84e01d7c5dab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.560Z","lastSeenAt":"2026-04-22T01:02:18.904Z"}],"details":{"listingId":"9a61818a-bfbf-4f7a-a533-84e01d7c5dab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/54 \\\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 402 challenge requiring X-PAYMENT header with USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/keys/54"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/54"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as exchange rates, token quotes, or gas estimates via micropayment","Running geocoding or data validation tasks with per-request billing and no subscription commitment"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing may add up versus flat-rate plans","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.635Z"},"updatedAt":"2026-04-22T01:02:18.904Z"}}