{"id":"cc884667-acd2-4d4b-8a83-c4b6a6502c04","shortId":"6s7F4C","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/178` is listed as \"Premium API Access\" and advertises a max amount 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 x402 challenge confirms the endpoint is live and uses the \"exact\" payment scheme with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 per call. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this specific endpoint and others remain undocumented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","no-rate-limits"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["No API documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no technical content.","The specific purpose and expected input/output of /api/v1/transfers/178 is undocumented; 'Premium API Access' is a generic label.","No OpenAPI or schema information is provided for any endpoint on the platform.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented request/response formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/178","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema documentation, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The purpose of this specific '/transfers/178' endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,62,119,182 '000':108 '0x8335':113 '20':107 '2913':114 '300':149 '402 payment api' '6':123 'accept':127 'access':100 'across':45 'actual':204 'advertis':102,155 'ai/ml':48 'amount':105 'analysi':159 'analyt':47 'api':5,20,37,72,99 'application/json':132 'attach':82 'base':8,23,69,109,116 'base network api' 'base-network' 'broader':153 'call':4,19,184 'caller':80 'challeng':135 'classif':162 'confirm':136 'connect':194 'convers':174 'data':46,176 'decim':124 'detail':201 'doc':188 'document':186 'embed':163 'enabl':36 'endpoint':44,55,92,126,138,156,210 'equal':118 'estim':171 'exact':144 'exchang':166 'feed':165 'finance/web3':50 'gas':170 'generat':177 'geocod':172 'given':120 'header':86 'howev':185 'infer':49 'infrastructur':52 'json-api' 'key':73 'limit':75 'list':96 'live':140 'low payment fee' 'lowpaymentfee.com':31 'max':104 'micropayment api' 'network':9,24,70 'no-api-key' 'no-rate-limits' 'offer':40 'other':212 'page':187 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85,145 'per':3,18,59,183 'platform':6,21,38,154 'post':128 'premium':98 'price':164,189 'prompt':196 'quot':169 'rate':74,167 'readm':190 'remain':213 'request':60,89,129 'request/response':205 'requir':79 'return':131,191 'schema':206 'scheme':146 'second':150 'sentiment':158 'settl':64 'simpli':81 'specif':91,209 'subscript':77 'summar':161 'technic':200 'text':160 'timeout':151 'token':168 'undocu':214 'unit':110 'usdc':15,30,66,112,121 'usdc api' 'usdc-settlement' 'use':142 'util':53 'valid':173 'varieti':42 'via':10,25 'wallet':195 'x402':11,26,35,84,134 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"73d3799e-f612-4ecf-a054-ccde114edf71","listingId":"cc884667-acd2-4d4b-8a83-c4b6a6502c04","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:33.748Z"}],"sources":[{"listingId":"cc884667-acd2-4d4b-8a83-c4b6a6502c04","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/178","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:33.748Z","lastSeenAt":"2026-04-23T04:02:06.310Z"}],"details":{"listingId":"cc884667-acd2-4d4b-8a83-c4b6a6502c04","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/178 \\\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 maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transfers/178"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call billing","Testing x402 payment flows on Base network at low cost"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Consumers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.692Z"},"updatedAt":"2026-04-23T04:02:06.310Z"}}