{"id":"ea69b00b-04f2-45e6-b4a6-4a7a2878ed56","shortId":"JUkaUT","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 broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/transactions/201` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. The challenge specifies the `exact` payment scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation utilities — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual behavior, request schemas, and response formats for any of these endpoints are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["All documentation pages (/docs, /api, /pricing, /README) are empty, showing only 'Connect wallet'","No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/transactions/201 ('Premium API Access') is not explained anywhere","No request body schema or response schema documented — callers cannot know what to send or expect back","The platform lists many endpoints on its landing page but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/201","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/201","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no documentation of request/response schemas, and all doc pages are empty ('Connect wallet'). The actual functionality behind 'Premium API Access' at /api/v1/transactions/201 is unclear — the name is generic and no examples 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'/request':13,28 '0.02':12,27,59,138,192 '000':122 '0x8335':127 '20':121 '2913':128 '300':150 '402':116 '402 payment api' '6':134 'accept':155 'access':112 'actual':214 'addit':165 'advertis':164 'ai/ml':49 'analysi':169 'analyt':48 'api':5,20,37,71,111 'application/json':160 'attach':87 'base':8,23,67,123,130 'base network api' 'behavior':215 'beyond':197 'broad':42 'broader':162 'call':4,19,140 'caller':86 'challeng':117,142 'classif':172 'commit':78 'connect':210 'convers':184 'cost':58 'data':47,52 'decim':135 'document':196 'embed':173 'empti':203 'enabl':36 'endpoint':45,57,104,154,166,225 'equal':137 'essenti':202 'estim':181 'everi':56 'exact':145 'exchang':176 'feed':175 'finance/web3':51 'format':220 'gas':180 'generat':186 'geocod':182 'handl':83 'header':90 'howev':195 'http':93 'immedi':99 'includ':167 'infer':50 'inlin':85 'json-api' 'key':72 'land':199 'limit':75 'list':108 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'page':200,207 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,89,146 'per':3,18,60,139 'platform':6,21,38,163 'point':194 'post':156 'post-method' 'premium':110 'price':174,193 'protocol':82 'quot':179 'rate':74,177 'receiv':96 'request':61,94,118,157,216 'requir':79 'respons':98,219 'return':114,159 'schema':217 'scheme':147 'second':151 'sentiment':168 'servic':55 'set':43 'settlement':101 'show':209 'sinc':131 'span':46 'specif':103 'specifi':143 'sub':206 'sub-pag':205 'summar':171 'text':170 'timeout':152 'token':178 'undocu':227 'unit':124 'upon':100 'usdc':15,30,64,126,132 'usdc api' 'usdc-base' 'use':133 'util':54,187 'valid':183 'via':10,25 'wallet':211 'x402':11,26,35,81 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"da82c549-e572-4c51-bb60-4985a7de10c5","listingId":"ea69b00b-04f2-45e6-b4a6-4a7a2878ed56","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/201","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:06.001Z"}],"sources":[{"listingId":"ea69b00b-04f2-45e6-b4a6-4a7a2878ed56","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/201","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:06.001Z","lastSeenAt":"2026-04-23T19:01:45.750Z"}],"details":{"listingId":"ea69b00b-04f2-45e6-b4a6-4a7a2878ed56","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/201 \\\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 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/201"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/201"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call billing","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","AI agents that can settle USDC payments on Base per request","Users who want zero-commitment, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.172Z"},"updatedAt":"2026-04-23T19:01:45.750Z"}}