{"id":"fe9dc43c-a257-468e-aa8c-950d6765049b","shortId":"Gcjh3n","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/transfers/150` is listed as \"Premium API Access\" and was probed live, returning a valid 402 challenge. Its maxAmountRequired is 20000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals. The platform advertises no API keys, no rate limits, no minimums, and instant access — payment is handled entirely through the x402 payment header.\n\nDocumentation is extremely thin: the /docs, /pricing, /api, 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 usage examples available from the crawl. The exact functionality behind the `/api/v1/transfers/150` endpoint is unclear — the description simply says \"Premium API Access\" without specifying what data or service it returns. Users should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API access","402 payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema specification found","The specific function of /api/v1/transfers/150 is unclear; 'Premium API Access' is not descriptive","No request body schema or response format documented anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/150","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/150","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, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific endpoint (/api/v1/transfers/150) is undocumented beyond the generic label 'Premium API 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'/api/v1/transfers/150':116,216 '/docs':177 '/pricing':178 '/readme':181 '/request':19,38 '0.02':18,37,99,143 '0x8335':140 '20000':135 '402':130 '402 payment API' '6':147 'Base network API' 'USDC API' 'access':122,162,226 'across':58 'advertis':151 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,153,225 'avail':207 'base':8,27,107,136 'behind':214 'broad':50 'call':4,23 'catalog':51 'categori':60 'challeng':131 'classif':75 'classification' 'connect':187 'contact':241 'content':193 'convers':92 'crawl':210 'crypto API access' 'data':11,30,61,65,230 'data-analytics' 'decim':148 'descript':221 'detail':245 'document':172,202 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,217 'entir':166 'equal':142 'estim':86 'exact':212 'exampl':206 'exchang':81 'expect':237 'experi':239 'export':66 'extrem':174 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':213 'gas':85 'generat':93 'geocod':90 'geocoding' 'given':144 'handl':165 'header':171 'infrastructur':88 'insight':67 'instant':161 'key':154 'learn':70 'limit':157 'list':118 'live':126 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'maxamountrequir':133 'metric':63 'micropayment API' 'minimum':159 'network':108 'no-api-key' 'offer':48 'openapi':197 'page':182 'paid':102 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':163,170 'per':3,22,55,100 'platform':6,25,46,150 'premium':120,224 'price':79,97 'probe':125 'prompt':189 'protocol':112 'provid':243 'quot':84 'rate':82,156 'render':184 'report':64 'request':56,101 'request/response':200 'return':127,234 'say':223 'schema':201 'sentiment':71 'sentiment-analysis' 'servic':232 'simpli':222 'spec':198 'specif':114 'specifi':228 'summar':74 'text':73 'text-summarization' 'thin':175 'token':83 'unclear':219 'unit':137 'usag':205 'usdc':104,139,145 'usdc-base' 'user':235 'util':15,34,89 'valid':91,129 'via':9,28,109 'wallet':188 'web3':78 'without':227 'x402':10,29,43,111,169 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"6bfdfb1a-17e2-4f59-b8cd-a2b34084f191","listingId":"fe9dc43c-a257-468e-aa8c-950d6765049b","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:31.285Z"}],"sources":[{"listingId":"fe9dc43c-a257-468e-aa8c-950d6765049b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:31.285Z","lastSeenAt":"2026-04-22T09:01:47.946Z"}],"details":{"listingId":"fe9dc43c-a257-468e-aa8c-950d6765049b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/150 \\\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 are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/150"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with no subscription commitment","Using utility services like geocoding, validation, and conversion via micropayments"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Projects needing low-cost per-request pricing without rate limits","x402-compatible clients settling in USDC on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.812Z"},"updatedAt":"2026-04-22T09:01:47.946Z"}}