{"id":"7714bb39-13dd-4fbb-983f-83f76dd315ee","shortId":"RX8pEg","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/charges/60` 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 $0.02 per request.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind `/api/v1/charges/60` (labeled \"Premium API Access\") is unclear — it does not correspond to any of the named endpoints on the landing page, and no description of what it returns is provided.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or schema definition found","The endpoint path /api/v1/charges/60 does not match any of the named endpoints listed on the landing page; its actual functionality is unclear","No example request or response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/60","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/charges/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific endpoint path '/api/v1/charges/60' is not explained anywhere on the site. The actual functionality behind this endpoint is 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'/api/v1/charges/60':60,197 '/docs':161 '/pricing':163 '/readme':165 '/request':13,30 '0.02':12,29,82,153 '000':76 '20':75 '402':70 'Base network API' 'USDC API' 'accept':50 'access':66,96,201 'across':112 'actual':194 'advertis':87 'ai':122 'ai-inference' 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,200 'attach':99 'avail':192 'base':8,25,55,77 'behind':196 'broader':108 'call':4,21,84 'categori':114 'challeng':71 'classif':129 'connect':171 'convers':146 'correspond':207 'crypto-data' 'data':115,119 'data-analytics' 'descript':220 'detail':178 'document':156,187 'embed':130 'endpoint':59,111,149,213 'estim':140 'exampl':190 'exchang':135 'export':120 'extrem':158 'feed':134 'financ':131 'finance-data' 'four':113 'function':195 'gas':139 'generat':147 'geocod':144 'geocoding' 'header':103 'i.e':81 'infrastructur':142 'insight':121 'instant':95 'key':16,33,90 'label':198 'land':216 'learn':124 'limit':93 'list':62,151 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'micropayment API' 'name':212 'network':9,26,56 'no-api-key' 'offer':110 'openapi':182 'page':166,217 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payload':191 'payment':52,102 'per':3,20,40,83,154 'platform':6,23,43,86,109 'premium':64,199 'price':133 'prompt':173 'protocol':48 'provid':226 'quot':138 'rate':92,136 'render':168 'report':118 'request':41,72,106,155 'request/response':185 'requir':17,34 'return':68,224 'schema':186 'sentiment':125 'simpli':98 'spars':159 'spec':183 'specif':58 'summar':128 'technic':177 'text':127 'token':137 'unclear':203 'unit':78 'usdc':51,80 'usdc-base-network' 'use':45 'util':143 'utility-services' 'valid':145 'via':10,27 'wallet':172 'web3':132 'x402':11,28,47,101 'x402 API' 'x402-payment'","prices":[{"id":"7b937f24-4f3d-4d16-b357-4476a82a5cfb","listingId":"7714bb39-13dd-4fbb-983f-83f76dd315ee","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/charges/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:34.443Z"}],"sources":[{"listingId":"7714bb39-13dd-4fbb-983f-83f76dd315ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:34.443Z","lastSeenAt":"2026-04-23T06:31:02.947Z"}],"details":{"listingId":"7714bb39-13dd-4fbb-983f-83f76dd315ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/60 \\\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/charges/60"},{"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, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/60"}],"useCases":["Accessing data analytics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto and finance data with micropayments","Geocoding and utility operations paid per request"],"bestFor":["Developers who want API access without managing API keys or subscriptions","Agents that need to pay per call using on-chain USDC on Base","Low-volume or bursty workloads where flat-rate pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime documentation","Users who need detailed API documentation, schemas, or example responses before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.108Z"},"updatedAt":"2026-04-23T06:31:02.947Z"}}