{"id":"74b32901-1322-43ea-b528-00ba0fcacf84","shortId":"SCptMb","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/ML inference, finance/Web3, and infrastructure utilities. 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/27` is listed as \"Premium API Access\" but its exact functionality is not documented in the available crawl material. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base units of USDC (0.02 USDC = $0.02) per call on Base. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02 price point.\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 usage examples available. The actual behavior of this specific transfer endpoint (and most other endpoints) cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["infrastructure","api-gateway"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","crypto payment api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific function of /api/v1/transfers/27 ('Premium API Access') is unknown — the name and path suggest a transfer operation but no details are provided","Cannot verify what data or service is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/27","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/27","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 pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schemas, and no examples. The specific endpoint's purpose ('Premium API Access' at /transfers/27) is entirely undocumented. The docs pages all render only a wallet-connect 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'/api/v1/transfers/27':94 '/docs':174 '/pricing':176 '/readme':178 '/request':13,28 '0.02':12,27,62,133,135,166 '000':128 '20':127 'accept':120 'access':100 'across':45 'actual':206 'advertis':143 'ai/ml':48 'analysi':147 'analyt':47 'api':5,20,37,72,99 'attach':82 'avail':110,204,222 'base':8,23,69,129,139 'base network api' 'base-network' 'behavior':207 'broader':141 'call':4,19,137 'caller':80 'cannot':217 'challeng':115 'classif':150 'confirm':116 'connect':184 'content':190 'convers':158 'crawl':111 'crypto payment api' 'data':46,160 'determin':219 'document':107,169,199 'embed':151 'enabl':36 'endpoint':44,55,92,144,212,216 'exact':103 'exampl':203 'exchang':154 'export':161 'extrem':171 'feed':153 'finance/web3':50 'function':104 'geocod':156 'header':86 'infer':49 'infrastructur':52 'key':73 'limit':75 'list':96 'live':119 'low payment fee' 'lowpaymentfee.com':31 'materi':112,223 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':194 'page':179 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85 'per':3,18,59,136 'platform':6,21,38,142 'point':168 'post':121 'post-endpoint' 'premium':98 'price':152,167 'prompt':186 'rate':74,155 'render':181 'request':60,89,122 'request/response':197 'requir':79,124 'schema':198 'sentiment':146 'settl':64 'simpli':81 'spars':172 'spec':195 'specif':91,210 'subscript':77 'summar':149 'text':148 'transfer':211 'unit':130 'usag':202 'usdc':15,30,66,132,134 'usdc api' 'usdc-settlement' 'util':53 'valid':157 'varieti':42 'via':10,25 'wallet':185 'x402':11,26,35,84,114 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"062ca9a4-ddfa-4c1d-b9ab-b990e520dd62","listingId":"74b32901-1322-43ea-b528-00ba0fcacf84","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:50.588Z"}],"sources":[{"listingId":"74b32901-1322-43ea-b528-00ba0fcacf84","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:50.588Z","lastSeenAt":"2026-04-22T11:32:28.986Z"}],"details":{"listingId":"74b32901-1322-43ea-b528-00ba0fcacf84","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/27 \\\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, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC (0.02 USDC) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/27"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API access without pre-registration or API keys","Programmatic pay-per-call access to utility and data endpoints","Testing x402 payment protocol integrations"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously","Projects already operating on the Base L2 network"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring fiat-only payment methods","High-volume use cases where per-request pricing is cost-prohibitive compared to subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.896Z"},"updatedAt":"2026-04-22T11:32:28.986Z"}}