{"id":"69e06dcc-6a69-4edb-b7c8-46ba49e9d7a0","shortId":"T9P8t4","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 at `/api/v1/transfers/190` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. Payment is made via the x402 exact scheme on the Base network, with a 300-second timeout. The endpoint accepts HTTP 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 — all at the same $0.02 price point. However, documentation beyond the landing page 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 this specific \"Premium API Access\" endpoint actually returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","http-post","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of the specific endpoint '/api/v1/transfers/190' ('Premium API Access') is completely undocumented","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/190","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/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' at /api/v1/transfers/190 actually does. The docs/pricing/README pages are all blank beyond a wallet connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,62,113,172 '000':100 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':106 '20':99 '300':130 '402 payment API' '6':109 'Base network API' 'USDC pay-per-call' 'accept':135 'access':91,220 'across':45 'actual':222 'addit':146 'advertis':95,145 'ai':48 'analysi':150 'analyt':47 'api':5,20,37,74,90,186,219 'application/json':141 'asset':105 'base':8,23,70,101,126 'beyond':177 'broader':143 'call':4,19,115 'categori':56 'challeng':94 'classif':153 'commit':79 'connect':195 'convers':165 'crypto API access' 'data':46 'decim':110 'descript':213 'detail':202 'doc':185 'document':176 'embed':154 'enabl':36 'endpoint':44,58,83,134,147,221 'equat':111 'estim':162 'exact':122 'exampl':210 'exchang':157 'extrem':182 'feed':156 'financ':51 'gas':161 'generat':167 'geocod':163 'howev':175 'http':136 'http-post' 'includ':148 'infrastructur':54 'json-response' 'key':75 'land':179 'learn':50 'limit':77 'list':87 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':118 'maxamountrequir':97 'micropayment API' 'network':9,24,71,127 'offer':40 'openapi':206 'page':180,190 'paid':65 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payment':116 'per':3,18,63,114 'platform':6,21,38,144 'point':174 'post':137 'premium':89,218 'price':60,155,173,187 'prompt':197 'quot':160 'rate':76,158 'readm':189 'render':192 'request':64,138 'request/response':209 'requir':80 'return':140,223 'schema':207 'scheme':123 'second':131 'sentiment':149 'spars':183 'specif':82,217 'summar':152 'technic':201 'text':151 'timeout':132 'token':159 'unit':102 'usdc':15,30,67,104 'usdc-base-network' 'use':108 'util':55 'valid':164 'varieti':42 'via':10,25,119 'wallet':196 'web3':52 'x402':11,26,35,93,121 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"92a7949c-611b-4dfd-b7d3-f054013e8e02","listingId":"69e06dcc-6a69-4edb-b7c8-46ba49e9d7a0","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/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:51.180Z"}],"sources":[{"listingId":"69e06dcc-6a69-4edb-b7c8-46ba49e9d7a0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/190","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:51.180Z","lastSeenAt":"2026-04-22T23:02:17.586Z"}],"details":{"listingId":"69e06dcc-6a69-4edb-b7c8-46ba49e9d7a0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/190 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base network with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transfers/190"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/190"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to various API services with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access","Exploring x402 payment protocol integrations on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up quickly","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.948Z"},"updatedAt":"2026-04-22T23:02:17.586Z"}}