{"id":"8dba8cc4-bcd3-4d84-b923-92ce0b5853de","shortId":"NXHTWS","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/50` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 listed at the same $0.02/request 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 schema, no request/response examples, and no description of what the `/api/v1/transfers/50` endpoint actually returns or what input it expects beyond a POST request. The endpoint is live and responds with a valid x402 challenge, but the actual functionality behind this specific path is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The specific functionality of /api/v1/transfers/50 ('Premium API Access') is not described anywhere","The platform lists many endpoint categories but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/50","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/transfers/50 actually does. The listing is effectively a stub with confirmed 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'/request':13,30,156 '0.02':12,29,82,155 '000':76 '20':75 '402':70 'accept':50 'access':66,96 'across':112 'actual':197,221 'advertis':87 'ai':122 'ai-inference' 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,165 'attach':99 'avail':230 'base':8,25,55,77 'base network api' 'behind':223 'beyond':204 'broader':108 'call':4,21,84 'categori':114 'challeng':71,218 'classif':129 'connect':174 'content':180 'convers':146 'crypto api access' 'data':115,119 'data-analytics' 'descript':191 'doc':164 'document':159 'embed':130 'endpoint':59,111,149,196,209 'estim':140 'exampl':188 'exchang':135 'expect':203 'export':120 'extrem':161 'feed':134 'financ':131 'finance-data' 'four':113 'function':222 'gas':139 'generat':147 'geocod':144 'header':103 'i.e':81 'infrastructur':142 'input':201 'insight':121 'instant':95 'key':16,33,90 'learn':124 'limit':93 'list':62,151 'live':211 'low payment fee' 'lowpaymentfee.com':35 'machin':123 'materi':231 'metric':117 'micropayment api' 'network':9,26,56 'no-api-key' 'offer':110 'openapi':184 'page':169 'path':226 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,102 'per':3,20,40,83 'platform':6,23,43,86,109 'point':158 'post':206 'post-endpoint' 'premium':64 'price':133,157,166 'prompt':176 'protocol':48 'quot':138 'rate':92,136 'readm':168 'render':171 'report':118 'request':41,72,106,207 'request/response':187 'requir':17,34 'respond':213 'return':68,198 'schema':185 'sentiment':125 'simpli':98 'spars':162 'specif':58,225 'summar':128 'text':127 'token':137 'unclear':228 'unit':78 'usdc':51,80 'usdc api' 'usdc-base-network' 'use':45 'util':143 'utility-services' 'valid':145,216 'via':10,27 'wallet':175 'web3':132 'x402':11,28,47,101,217 'x402 api' 'x402-payment'","prices":[{"id":"0b04ecf7-b935-4025-b035-4bf9207556eb","listingId":"8dba8cc4-bcd3-4d84-b923-92ce0b5853de","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:54.180Z"}],"sources":[{"listingId":"8dba8cc4-bcd3-4d84-b923-92ce0b5853de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:54.180Z","lastSeenAt":"2026-04-22T15:02:25.565Z"}],"details":{"listingId":"8dba8cc4-bcd3-4d84-b923-92ce0b5853de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/50 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/50"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/50"}],"useCases":["Accessing data analytics and reports on a per-request payment basis without subscription","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching financial data like exchange rates, token quotes, and gas estimates via micropayments","Using utility services like geocoding and validation without needing API keys"],"bestFor":["Developers who want pay-as-you-go API access without subscriptions or API key management","Agent-based systems that can autonomously pay for API calls via x402/USDC on Base","Users who need occasional access to diverse API endpoints at low per-call cost"],"notFor":["High-volume production workloads where per-request pricing may add up versus flat-rate plans","Users who need detailed API documentation, schemas, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.75Z"},"updatedAt":"2026-04-22T15:02:25.565Z"}}