{"id":"3a5280ed-b79f-45a6-aec7-6b5e7ed8d2cf","shortId":"T86KHc","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. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/104` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The broader platform advertises additional categories of endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 per call.\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 spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what input the `/api/v1/transfers/104` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content","No OpenAPI or schema definition for request or response payloads","The specific purpose of /api/v1/transfers/104 is undocumented; 'Premium API Access' is vague","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/104","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The purpose of the specific '/transfers/104' endpoint is unclear beyond its generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,64,123,164 '000':112 '0x8335':117 '20':111 '2913':118 '402':211 '6':127 'Base network API' 'USDC API' 'accept':131 'access':102 'addit':141 'advertis':107,140 'ai/ml':49 'analysi':147 'analyt':48 'api':5,20,37,74,101,173 'application/json':136 'attach':84 'avail':202 'base':8,23,71,113,120 'base-network' 'broad':42 'broader':138 'call':4,19,166 'caller':82 'categori':142 'challeng':106,213 'classif':150 'confirm':206 'connect':182 'content':188 'data':47,52 'decim':128 'doc':172 'document':167,197,216 'embed':151 'enabl':36 'endpoint':45,57,94,130,144,204,224 'equal':122 'exampl':200 'exchang':154 'expect':225 'extrem':169 'feed':153 'finance/web3':51 'geocod':156 'given':124 'header':88 'includ':145 'infer':50 'input':221 'json-response' 'key':75 'limit':77 'list':98 'live':207 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':109 'micropayment API' 'network':9,24,72 'no-api-key' 'offer':40 'openapi':192 'page':177 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payload':201 'payment':87 'per':3,18,61,165 'platform':6,21,38,139 'post':132 'post-method' 'premium':100 'price':152,174 'prompt':184 'proper':210 'rate':76,155 'readm':176 'render':179 'request':62,91,133 'request/response':195 'requir':81 'return':135,208,229 'schema':196 'sentiment':146 'servic':55 'set':43 'settl':66 'simpli':83 'span':46 'spars':170 'spec':193 'specif':93 'subscript':79 'summar':149 'text':148 'unclear':219 'unit':114 'usdc':15,30,68,116,125 'usdc-settlement' 'util':54 'valid':157 'via':10,25 'wallet':183 'without':215 'x402':11,26,35,86,105,212 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1afd7b1d-7b97-4fff-b9ab-58e0bd11b033","listingId":"3a5280ed-b79f-45a6-aec7-6b5e7ed8d2cf","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:16.100Z"}],"sources":[{"listingId":"3a5280ed-b79f-45a6-aec7-6b5e7ed8d2cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/104","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:16.100Z","lastSeenAt":"2026-04-23T06:31:40.562Z"}],"details":{"listingId":"3a5280ed-b79f-45a6-aec7-6b5e7ed8d2cf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/104 \\\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 minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settled in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transfers/104"},{"claim":"Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic transfers or data retrieval without subscription overhead"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up vs. subscription plans","Developers who cannot settle payments in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.547Z"},"updatedAt":"2026-04-23T06:31:40.562Z"}}