{"id":"ca60bcd5-152c-4f44-a213-e45585672b0f","shortId":"pApdVP","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/15` is labeled \"Premium API Access\" and requires a payment of 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\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/15` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","web3-data","geocoding","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific purpose of /api/v1/transactions/15 ('Premium API Access') is undocumented and unclear","Cannot verify what data or functionality any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/15","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/15","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 it accepts USDC payments on Base. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' at /api/v1/transactions/15 actually returns. The listing is essentially a 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'/request':13,28,150 '0.02':12,27,76,149 '000':70 '20':69 '402':200 '402 payment api' 'accept':46 'access':61,90,219 'across':106 'actual':191 'advertis':81 'ai':116 'ai-inference' 'analysi':120 'analyt':110 'api':5,20,38,60,83,159,218 'attach':93 'base':8,23,51,71 'base network api' 'beyond':214 'broader':102 'call':4,19,78 'categori':108 'challeng':201 'classif':123 'connect':168 'content':174 'convers':140 'data':109,113,209 'data-analytics' 'descript':185 'doc':158 'document':153,204 'embed':124 'endpoint':55,105,143,190,194 'estim':134 'exampl':182 'exchang':129 'export':114 'extrem':155 'feed':128 'financ':125 'finance-data' 'four':107 'function':211 'gas':133 'generat':141 'generic':216 'geocod':138 'geocoding' 'header':97 'i.e':75 'infrastructur':136 'insight':115 'instant':89 'key':84 'label':58,220 'learn':118 'limit':87 'list':145 'live':196 'low payment fee' 'lowpaymentfee.com':31 'machin':117 'metric':111 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':104 'openapi':178 'page':163 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,65,96 'per':3,18,36,77 'platform':6,21,39,80,103 'point':152 'premium':59,217 'price':127,151,160 'prompt':170 'protocol':44 'provid':213 'quot':132 'rate':86,130 'readm':162 'render':165 'report':112 'request':37,100 'request/response':181 'requir':63 'return':192,197 'schema':179 'sentiment':119 'simpli':92 'spars':156 'specif':54 'summar':122 'text':121 'token':131 'unclear':207 'unit':72 'usdc':15,30,47,74 'usdc api' 'usdc-base-network' 'use':41 'util':137 'utility-services' 'valid':139,199 'via':10,25 'wallet':169 'web3':126 'web3-data' 'without':203 'x402':11,26,43,95 'x402 api' 'x402-payment'","prices":[{"id":"c0e1a7a4-5c6d-4e99-b2a1-f1c4ade9811f","listingId":"ca60bcd5-152c-4f44-a213-e45585672b0f","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:45.511Z"}],"sources":[{"listingId":"ca60bcd5-152c-4f44-a213-e45585672b0f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:45.511Z","lastSeenAt":"2026-04-22T23:02:08.970Z"}],"details":{"listingId":"ca60bcd5-152c-4f44-a213-e45585672b0f","quickStartSnippet":"# The endpoint requires an x402 payment header with USDC on Base.\n# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/15\n# 2. Parse the 402 response, construct the X-PAYMENT header\n#    with a signed USDC payment of $0.02 (20000 base units),\n#    then resend with the header attached.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/15"},{"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"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics and reports on a per-request payment basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching crypto price feeds, exchange rates, and gas estimates via micropayments","Geocoding and data conversion utilities paid per use"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agents and bots that can attach x402 payment headers automatically","Users who prefer crypto-native (USDC on Base) billing over traditional API keys"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers unfamiliar with x402 protocol or crypto wallet-based payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.197Z"},"updatedAt":"2026-04-22T23:02:08.970Z"}}