{"id":"b4a74fc9-231b-4a52-b3a3-9ee65ef25616","shortId":"wLRcDt","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 is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/transactions/81` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific endpoint being listed here (`/api/v1/transactions/81`) is described only as \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional content. Without documentation or example responses, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content","The specific functionality of /api/v1/transactions/81 is unknown; 'Premium API Access' is not descriptive","No OpenAPI schema or example responses provided","No information about what input the POST endpoint expects"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/81","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/transactions/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns 402 with a valid x402 challenge), but there is no documentation, no OpenAPI schema, no example requests or responses, and the endpoint's actual functionality is completely undescribed beyond the generic label 'Premium API Access'. The docs pages are 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'/request':13,28,148 '0.02':12,27,74,147 '000':68 '20':67 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,88,165 'across':104 'actual':203 'addit':195 'advertis':79 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,81,164,181 'attach':91 'base':8,23,51,69 'behavior':204 'broader':100 'call':4,19,76 'categori':106 'charg':64 'classif':121 'connect':190 'content':196 'convers':138 'data':107,111,172 'describ':160 'doc':178 'document':169,198 'embed':122 'endpoint':55,103,141,154,207 'estim':132 'exampl':200 'exchang':127 'export':112 'feed':126 'financ':123 'four':105 'function':174 'gas':131 'generat':139 'geocod':136 'header':95 'howev':151 'i.e':73 'infrastructur':134 'insight':113 'instant':87 'json-response' 'key':82 'label':59 'learn':116 'limit':85 'list':143,156 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'network':9,24,52 'no-api-key' 'offer':102 'page':182 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,94 'per':3,18,36,75 'platform':6,21,39,78,101 'point':150 'premium':60,163 'premium API access' 'price':125,149,179 'prompt':192 'protocol':44 'quot':130 'rate':84,128 'render':187 'report':110 'request':37,98 'respons':201 'return':176 'sentiment':117 'simpli':90 'site':185 'specif':54,153 'summar':120 'text':119 'token':129 'unit':70 'unknown':209 'usdc':15,30,47,72 'usdc-base-network' 'use':41 'util':135 'valid':137 'via':10,25 'wallet':191 'web3':124 'without':197 'x402':11,26,43,93 'x402 API' 'x402-payment'","prices":[{"id":"26988092-10ef-4d87-abea-3aa2bce364e1","listingId":"b4a74fc9-231b-4a52-b3a3-9ee65ef25616","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/transactions/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:07.619Z"}],"sources":[{"listingId":"b4a74fc9-231b-4a52-b3a3-9ee65ef25616","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:07.619Z","lastSeenAt":"2026-04-23T10:31:29.154Z"}],"details":{"listingId":"b4a74fc9-231b-4a52-b3a3-9ee65ef25616","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/81 \\\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 requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/81"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/81"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API consumption with per-call USDC payments on Base","Accessing premium data or services without API key registration","Programmatic pay-as-you-go API calls settled on-chain"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume use cases where per-call pricing is cost-prohibitive compared to subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.972Z"},"updatedAt":"2026-04-23T10:31:29.154Z"}}