{"id":"a02e341f-6d2c-4616-be69-2bdbc4cb8e45","shortId":"puKEuh","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 `/api/v1/keys/40` 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 attach an X-PAYMENT header with each request.\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 listed endpoints share the same $0.02/request pricing with no rate limits or minimum commitments.\n\nImportant caveat: the specific functionality behind `/api/v1/keys/40` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI spec, no request/response schema, and the crawled docs pages (pricing, README, API) returned only a wallet-connect prompt with no additional detail. Treat this listing as a stub until richer documentation becomes available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","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","402 payment api"],"warnings":["No OpenAPI or schema available — request and response formats are unknown","The specific endpoint /api/v1/keys/40 ('Premium API Access') has no documentation explaining its functionality","Crawled /pricing, /README, and /api pages returned only a wallet-connect prompt with no content","No rate-limit or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/40","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/40","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 no OpenAPI spec, no request/response schema, no documentation of what /api/v1/keys/40 actually returns, and the crawled doc pages were empty. This is effectively a stub 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'/request':19,38,163 '0.02':18,37,79,162 '000':83 '20':82 '402 payment api' '6':89 'access':74,187 'account':101 'addit':213 'advertis':119 'ai':12,31,130 'ai-inference' 'analysi':134 'analyt':124 'api':5,24,45,73,99,186,203 'attach':107 'avail':225 'base':8,27,63,84 'base network api' 'becom':224 'behind':177 'beyond':182 'broad':50 'call':4,23,81 'caller':106 'catalog':51 'categori':122 'caveat':173 'classif':137 'classification' 'commit':171 'connect':209 'convers':154 'cost':76 'crawl':198 'data':11,30,123,127 'data-analytics' 'decim':90 'detail':214 'doc':199 'document':181,223 'embed':138 'embeddings' 'enabl':44 'endpoint':16,35,57,67,121,158 'estim':148 'exchang':143 'export':128 'feed':142 'financ':13,32,139 'finance-data' 'four':120 'function':176 'gas':147 'generat':155 'geocod':152 'geocoding' 'handl':93 'header':112 'import':172 'infrastructur':150 'insight':129 'key':100 'label':184 'learn':132 'limit':168 'list':70,157,217 'low payment fee' 'lowpaymentfee.com':39 'machin':131 'metric':125 'micropayment api' 'minimum':170 'network':64 'offer':10,29 'openapi':191 'page':200 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':91,111 'per':3,22,55,80 'platform':6,25,46,118 'premium':72,185 'price':141,164,201 'prompt':210 'protocol':97 'provid':48 'quot':146 'rate':144,167 'readm':202 'report':126 'request':56,115 'request/response':194 'requir':105 'return':204 'richer':222 'schema':195 'sentiment':133 'sentiment-analysis' 'settl':58 'share':159 'spec':192 'specif':66,175 'stub':220 'subscript':103 'summar':136 'text':135 'text-summarization' 'token':145 'treat':215 'unit':85 'usdc':9,28,60,87 'usdc api' 'usdc-base' 'util':15,34,151 'utility-apis' 'valid':153 'via':94 'wallet':208 'wallet-connect':207 'web3':140 'wider':117 'x':110 'x-payment':109 'x402':43,96 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b352688f-c15f-46af-8d61-5a0db8509b10","listingId":"a02e341f-6d2c-4616-be69-2bdbc4cb8e45","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.127Z"}],"sources":[{"listingId":"a02e341f-6d2c-4616-be69-2bdbc4cb8e45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.127Z","lastSeenAt":"2026-04-22T09:02:14.488Z"}],"details":{"listingId":"a02e341f-6d2c-4616-be69-2bdbc4cb8e45","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/40 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/40"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/40"}],"useCases":["Agent-driven data retrieval without API key management","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto gas estimates or token quotes with micropayments","Geocoding or data conversion as a utility microservice"],"bestFor":["AI agents that need frictionless, keyless API access","Developers wanting pay-as-you-go endpoints without subscriptions","Crypto-native applications already on Base that can settle in USDC"],"notFor":["High-volume batch processing where per-call fees add up quickly","Users who need detailed SLAs, uptime guarantees, or enterprise support","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.264Z"},"updatedAt":"2026-04-22T09:02:14.488Z"}}