{"id":"09b0cf7e-d58a-4c3e-a048-56ed065789c4","shortId":"vQjCPw","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/infrastructure 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/45` 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 also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per call.\n\nDocumentation is extremely sparse. 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 actual functionality behind `/api/v1/transfers/45` and the other listed endpoints cannot be verified beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"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 OpenAPI or schema documentation available — all endpoint functionality is unverifiable","All doc/pricing/README pages render only 'Connect wallet' with no content","The specific endpoint /api/v1/transfers/45 has no description beyond 'Premium API Access' — its actual purpose is unclear","No request body schema or response schema documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/45","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/45","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/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual functionality behind the endpoints is unverifiable from available 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'/api/v1/transfers/45':96,213 '/docs':175 '/pricing':176 '/readme':179 '/request':13,28 '0.02':12,27,64,123,167 '000':112 '0x8335':117 '20':111 '2913':118 '6':127 'accept':131 'access':102 'actual':210 'advertis':107,141 'ai-inference' 'ai/ml':49 'also':140 'analysi':145 'analyt':48 'api':5,20,37,74,101 'application/json':136 'attach':84 'avail':205 'base':8,23,71,113,120 'base network api' 'behind':212 'beyond':222 'broad':42 'broader':138 'call':4,19,169 'caller':82 'cannot':219 'challeng':106,225 'classif':148 'classification' 'connect':185 'content':191 'convers':160 'crawl':208 'crypto api access' 'crypto-data' 'data':47,52 'data-analytics' 'decim':128 'document':170,200 'embed':149 'embeddings' 'enabl':36 'endpoint':45,57,94,130,142,218 'equal':122 'estim':157 'exampl':204 'exchang':152 'extrem':172 'feed':151 'finance-data' 'finance/web3':51 'function':211 'gas':156 'generat':162 'geocod':158 'geocoding' 'given':124 'header':88 'infer':50 'key':75 'limit':77 'list':98,217 'low payment fee' 'lowpaymentfee.com':31 'maxamountrequir':109 'metadata':226 'micropayment api' 'network':9,24,72 'offer':40 'openapi':195 'page':180 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87 'per':3,18,61,168 'platform':6,21,38,139 'post':132 'premium':100 'price':150 'prompt':187 'quot':155 'rate':76,153 'render':182 'request':62,91,133 'request/response':198 'requir':81 'return':135 'schema':199 'sentiment':144 'sentiment-analysis' 'servic':55 'set':43 'settl':66 'simpli':83 'span':46 'spars':173 'spec':196 'specif':93 'subscript':79 'summar':147 'text':146 'text-summarization' 'token':154 'unit':114 'usag':203 'usdc':15,30,68,116,125 'usdc api' 'usdc-base-network' 'utility-services' 'utility/infrastructure':54 'valid':159 'verifi':221 'via':10,25 'wallet':186 'x402':11,26,35,86,105,224 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"6879ad26-aca4-41df-b6ee-80f5a2571d0c","listingId":"09b0cf7e-d58a-4c3e-a048-56ed065789c4","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/45","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":"09b0cf7e-d58a-4c3e-a048-56ed065789c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:50.588Z","lastSeenAt":"2026-04-22T15:02:25.373Z"}],"details":{"listingId":"09b0cf7e-d58a-4c3e-a048-56ed065789c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/45 \\\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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/45"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates via pay-per-call","Geocoding, data validation, or format conversion as lightweight utility calls","Exporting analytics data or generating reports on a per-request billing basis"],"bestFor":["AI agents that need keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for low-volume usage","Crypto-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-request pricing becomes expensive","Users who need detailed documentation or SLA guarantees before integrating","Applications requiring non-USDC or non-Base-network payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.867Z"},"updatedAt":"2026-04-22T15:02:25.373Z"}}