{"id":"ac9b9bf7-6928-489a-bbd0-94810d23a1da","shortId":"U69uVr","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/355` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) 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 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/355` endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality it provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown beyond the 402 challenge","All doc/pricing/API/README pages return only a 'Connect wallet' prompt with no usable content","The specific endpoint /api/v1/transactions/355 has no description of what data it returns or what input it expects","Platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/355","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/355","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 on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no technical content. The purpose of the specific /transactions/355 endpoint is 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'/request':13,28 '0.02':12,27,77,150 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92 'across':108 'actual':193 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,160 'attach':95 'base':8,23,51,73 'broader':104 'call':4,19,80 'categori':110 'challeng':67,205 'classif':125 'connect':169 'convers':142 'crypto-paid API' 'data':111,115,213 'descript':187 'detail':176 'doc':159 'document':154,208 'embed':126 'endpoint':55,107,145,192,196 'estim':136 'exampl':184 'exchang':131 'export':116 'extrem':156 'feed':130 'financ':127 'four':109 'function':215 'gas':135 'generat':143 'geocod':140 'header':99 'howev':153 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'learn':120 'limit':89 'list':58 'live':198 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':180 'page':164 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,151 'platform':6,21,39,82,105 'post-method' 'premium':60 'price':129,148,161 'prompt':171 'protocol':44 'provid':217 'quot':134 'rate':88,132 'readm':163 'render':166 'report':114 'request':37,68,102,152 'request/response':183 'respond':200 'return':64,194 'schema':181 'sentiment':121 'simpli':94 'spars':157 'specif':54 'summar':124 'technic':175 'text':123 'token':133 'unclear':211 'uniform':147 'unit':74 'usd':78 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141,203 'via':10,25 'wallet':170 'web3':128 'without':207 'x402':11,26,43,97,204 'x402 API' 'x402-payment'","prices":[{"id":"e6fb625b-2d04-4514-8974-f8e0b10bf6ea","listingId":"ac9b9bf7-6928-489a-bbd0-94810d23a1da","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/355","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:19.258Z"}],"sources":[{"listingId":"ac9b9bf7-6928-489a-bbd0-94810d23a1da","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/355","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:19.258Z","lastSeenAt":"2026-04-23T11:31:27.672Z"}],"details":{"listingId":"ac9b9bf7-6928-489a-bbd0-94810d23a1da","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/355 \\\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 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/355"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, per-call payment APIs"],"bestFor":["Developers who want to pay per request without subscriptions or API keys","AI agents that can attach x402 payment headers automatically","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Developers without USDC on Base network or unfamiliar with x402 protocol"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.226Z"},"updatedAt":"2026-04-23T11:31:27.672Z"}}