{"id":"3f20a5f8-6e86-47db-b159-1700aca55952","shortId":"Zve88B","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 specific endpoint at `/api/v1/transfers/30` is listed as \"Premium API Access\" and accepts POST requests settled via the x402 exact-payment scheme.\n\nThe platform advertises four categories of APIs: 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 appear to follow the same $0.02 pricing model.\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 schema, no request/response examples, and no detailed documentation available from the crawl. The x402 challenge confirms the endpoint is live and accepts USDC (contract 0x8335…) on Base with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no content","No OpenAPI or JSON schema provided for any endpoint","The specific function of /api/v1/transfers/30 is unclear; 'Premium API Access' is a generic label","No request or response examples available to verify what this endpoint actually returns","The breadth of advertised capabilities (AI, finance, geo, etc.) cannot be verified from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/30","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation, no OpenAPI schema, no request/response examples, and the specific purpose of the /api/v1/transfers/30 endpoint is unclear beyond the generic label 'Premium API Access'. The docs pages are all empty wallet-connect 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'/request':13,28 '0.02':12,27,59,150,216 '000':212 '0x8335':203 '20':211 '6':220 'accept':92,200 'access':90 'advertis':105 'ai':117 'ai-inference' 'ai/ml':49 'amount':209 'analysi':121 'analyt':48,111 'api':5,20,37,71,89,109,159 'appear':145 'avail':187 'base':8,23,67,205,213 'base network api' 'broad':42 'call':4,19 'categori':107 'challeng':193 'classif':124 'classification' 'commit':78 'confirm':194 'connect':168 'content':174 'contract':202 'convers':141 'conversion' 'cost':58 'crawl':190 'crypto api access' 'crypto-quotes' 'data':47,52,110,114 'data-analytics' 'decim':221 'detail':185 'doc':158 'document':153,186 'embed':125 'embeddings' 'enabl':36 'endpoint':45,57,82,144,196 'estim':135 'everi':56 'exact':100 'exact-pay':99 'exampl':182 'exchang':130 'export':115 'extrem':155 'feed':129 'financ':126 'finance-data' 'finance/web3':51 'follow':147 'four':106 'gas':134 'generat':142 'geocod':139 'geocoding' 'given':217 'i.e':215 'infer':50 'infrastructur':137 'insight':116 'key':72 'learn':119 'limit':75 'list':86 'live':198 'low payment fee' 'lowpaymentfee.com':31 'machin':118 'max':208 'metric':112 'micropayment api' 'model':152 'network':9,24,68 'offer':40 'openapi':178 'page':163 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':101 'per':3,18,60 'platform':6,21,38,104 'post':93 'premium':88 'price':128,151,160 'prompt':170 'quot':133 'rate':74,131 'readm':162 'render':165 'report':113 'request':61,94 'request/response':181 'requir':79 'schema':179 'scheme':102 'sentiment':120 'sentiment-analysis' 'servic':55 'set':43 'settl':95 'span':46 'spars':156 'specif':81 'summar':123 'text':122 'text-summarization' 'token':132 'unit':214 'usdc':15,30,64,201,218 'usdc api' 'usdc-base-network' 'util':54,138 'valid':140 'validation' 'via':10,25,96 'wallet':169 'web3':127 'x402':11,26,35,98,192 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bdd6d887-2292-461c-bd33-9e6f22161008","listingId":"3f20a5f8-6e86-47db-b159-1700aca55952","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:40.996Z"}],"sources":[{"listingId":"3f20a5f8-6e86-47db-b159-1700aca55952","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:40.996Z","lastSeenAt":"2026-04-22T15:02:24.711Z"}],"details":{"listingId":"3f20a5f8-6e86-47db-b159-1700aca55952","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/30 \\\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 cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/30"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/30"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with micropayments","Exporting data or generating analytics reports via pay-as-you-go calls"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring low-friction micropayments in USDC on Base","Prototyping or low-volume usage where subscription plans are overkill"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot pay in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.354Z"},"updatedAt":"2026-04-22T15:02:24.711Z"}}