{"id":"b03ccd46-e49c-4321-b3ee-8e56b099dfa5","shortId":"3NMbLd","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 `/api/v1/transactions/134` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 uniformly priced at $0.02 per request.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/134` endpoint actually returns. The endpoint is live (confirmed via 402 challenge), but the actual functionality behind this specific path is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-platform","finance"],"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 documentation available for this endpoint","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content","The specific functionality of /api/v1/transactions/134 ('Premium API Access') is not described anywhere in the crawled material","Request and response formats are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/134","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/134","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs/pricing/README pages all show only 'Connect wallet'. The actual functionality of /api/v1/transactions/134 is 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'/request':13,28 '0.02':12,27,80,152 '000':74 '20':73 '402':66,203 '402 payment api' 'accept':46 'access':62 'actual':195,207 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,162 'attach':93 'avail':216 'base':8,23,51,75 'base network api' 'behind':209 'broader':106 'call':4,19,82 'caller':91 'categori':111 'challeng':67,204 'classif':127 'confirm':201 'connect':171 'convers':144 'data':113,117 'descript':189 'detail':178 'doc':161 'document':156 'embed':128 'endpoint':55,147,194,198 'estim':138 'exampl':186 'exchang':133 'export':118 'extrem':158 'feed':132 'financ':129 'function':208 'gas':137 'generat':145 'geocod':142 'header':98 'howev':155 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'json-response' 'key':85 'learn':122 'limit':88 'list':58 'live':200 'low payment fee' 'lowpaymentfee.com':31 'machin':121 'materi':217 'metric':115 'micropayment api' 'multipl':109 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':182 'page':166 'path':212 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81,153 'platform':6,21,39,107 'premium':60 'price':131,150,163 'prompt':173 'proof':104 'protocol':44 'quot':136 'rate':87,134 'readm':165 'render':168 'report':116 'request':37,154 'request/response':185 'requir':68,90 'return':64,196 'schema':183 'sentiment':123 'simpli':92 'spars':159 'specif':54,211 'summar':126 'technic':177 'text':125 'token':135 'unclear':214 'uniform':149 'unit':76 'usdc':15,30,47,78 'usdc api' 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25,202 'wallet':172 'web3':130 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 api' 'x402-payment'","prices":[{"id":"83982931-62cc-4619-9339-1d982cfe6baf","listingId":"b03ccd46-e49c-4321-b3ee-8e56b099dfa5","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/134","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:26.161Z"}],"sources":[{"listingId":"b03ccd46-e49c-4321-b3ee-8e56b099dfa5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/134","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:26.161Z","lastSeenAt":"2026-04-23T23:03:08.681Z"}],"details":{"listingId":"b03ccd46-e49c-4321-b3ee-8e56b099dfa5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/134 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/134"},{"claim":"All 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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/134"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to transaction or financial data without subscription commitments"],"bestFor":["Developers who want zero-commitment, per-call API pricing","AI agents with x402-compatible payment capabilities on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.126Z"},"updatedAt":"2026-04-23T23:03:08.681Z"}}