{"id":"079e40b2-1d13-45ee-94b9-19435c784b2c","shortId":"n9tF2u","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 an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/transfers/127` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is settled on-chain to the specified payTo address, with a 300-second timeout window.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented and unverifiable from the crawl material alone.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no substantive content.","The specific functionality of /api/v1/transfers/127 is undescribed; 'Premium API Access' is a generic label.","No request or response schemas are documented or inferrable from the crawl material.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none could be verified for actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/127","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/transfers/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and all doc pages return only 'Connect wallet' with no content. The specific purpose of '/api/v1/transfers/127' beyond 'Premium API Access' is 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'/request':13,28 '0.02':12,27,62,118 '000':107 '0x8335':112 '20':106 '2913':113 '300':134 '402 payment API' '6':116 'Base network API' 'USDC micropayment API' 'accept':92 'access':90 'across':45 'actual':182 'address':131 'advertis':141 'ai':48 'alon':198 'analysi':145 'analyt':47 'api':5,20,37,74,89 'base':8,23,70,108,115 'behavior':183 'broader':139 'call':4,19,120 'categori':56 'chain':126 'challeng':97 'classif':148 'commit':79 'confirm':98 'connect':173 'content':179 'convers':160 'crawl':196 'crypto-paid API' 'data':46,162 'decim':117 'doc':167 'document':165 'embed':149 'enabl':36 'endpoint':44,58,83,142,189 'estim':157 'exchang':152 'feed':151 'financ':51 'gas':156 'generat':163 'geocod':158 'howev':164 'infrastructur':54 'json-response' 'key':75 'learn':50 'limit':77 'list':86 'live':101 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'materi':197 'maximum':104 'network':9,24,71 'no-api-key' 'offer':40 'on-chain':124 'page':166 'paid':65 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':121 'payto':130 'per':3,18,63,119 'platform':6,21,38,140 'post':93 'post-endpoint' 'premium':88 'price':60,150,168 'prompt':175 'quot':155 'rate':76,153 'readm':169 'remain':190 'request':64,94,102 'requir':80 'respons':185 'return':170 'schema':186 'second':135 'sentiment':144 'settl':123 'specif':82 'specifi':129 'substant':178 'summar':147 'text':146 'timeout':136 'token':154 'undocu':191 'unit':109 'unverifi':193 'usdc':15,30,67,111 'usdc-base-network' 'util':55 'valid':159 'varieti':42 'via':10,25 'wallet':174 'web3':52 'window':137 'x402':11,26,35,96 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"24389375-0fc1-4165-9715-486f681e0c82","listingId":"079e40b2-1d13-45ee-94b9-19435c784b2c","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/transfers/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:16.713Z"}],"sources":[{"listingId":"079e40b2-1d13-45ee-94b9-19435c784b2c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/127","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:16.713Z","lastSeenAt":"2026-04-22T12:04:42.547Z"}],"details":{"listingId":"079e40b2-1d13-45ee-94b9-19435c784b2c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/127 \\\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":"Endpoint returns HTTP 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/127"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/127"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-use services into agent workflows via x402 protocol"],"bestFor":["Developers wanting frictionless API access without signup or subscriptions","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing with no minimum commitments"],"notFor":["Users who need detailed API documentation and response schemas before integrating","Applications requiring high-throughput bulk access at volume-discounted rates"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.517Z"},"updatedAt":"2026-04-22T12:04:42.547Z"}}