{"id":"201a6b51-cb4f-46c7-ac23-b2f9bd957017","shortId":"QV86bb","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 utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/393` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" 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 generation — all at the same $0.02 price point. However, documentation 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 usage examples available. It is unclear what specific functionality the `/api/v1/charges/393` endpoint provides beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API payments"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific functionality of /api/v1/charges/393 ('Premium API Access') is undefined — it is unclear what data or service it returns","Cannot verify what the endpoint actually does without paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/393","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/393","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 402 challenge, confirming it accepts payments. However, there is no documentation, no OpenAPI spec, no request/response schemas, and no examples. The specific functionality behind 'Premium API Access' at /api/v1/charges/393 is completely opaque. All non-homepage pages return only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,62,124,169 '000':113 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':119 '20':112 '300':137 '6':128 'Base network API' 'USDC micropayment API' 'accept':102 'access':100,225 'account':74 'across':45 'advertis':108,143 'ai/ml':48 'analysi':147 'analyt':47 'api':5,20,37,72,99,179,224 'asset':118 'attach':82 'avail':209 'base':8,23,69,114,121 'base-network' 'beyond':220 'broader':141 'call':4,19 'caller':80 'challeng':107 'classif':150 'connect':188 'convers':162 'crypto-paid API' 'data':46 'decim':129 'detail':195 'doc':178 'document':173,204 'embed':151 'enabl':36 'endpoint':44,55,92,144,218 'equal':123 'estim':159 'exact':134 'exampl':208 'exchang':154 'extrem':175 'feed':153 'finance/web3':50 'function':215 'gas':158 'generat':164 'generic':222 'geocod':160 'given':125 'header':86 'howev':172 'infer':49 'key':73 'label':226 'limit':77 'list':96 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':110 'network':9,24,70 'no-api-key' 'offer':40 'openapi':199 'page':183 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':85,131 'per':3,18,59 'platform':6,21,38,142 'point':171 'post':103 'post-endpoint' 'premium':98,223 'price':152,170,180 'prompt':190 'provid':219 'quot':157 'rate':76,155 'readm':182 'render':185 'request':60,89,104 'request/response':202 'requir':79 'schema':203 'scheme':132 'second':138 'sentiment':146 'serverless API payments' 'servic':53 'settl':64 'simpli':81 'spars':176 'spec':200 'specif':91,214 'summar':149 'technic':194 'text':148 'timeout':139 'token':156 'unclear':212 'unit':115 'usag':207 'usdc':15,30,66,117,126 'usdc-settlement' 'util':52 'valid':161 'varieti':42 'via':10,25 'wallet':189 'x402':11,26,35,84,106 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"23789184-9d4b-4969-9798-89d5e7636d4c","listingId":"201a6b51-cb4f-46c7-ac23-b2f9bd957017","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/393","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:19.909Z"}],"sources":[{"listingId":"201a6b51-cb4f-46c7-ac23-b2f9bd957017","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/393","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:19.909Z","lastSeenAt":"2026-04-24T12:03:22.796Z"}],"details":{"listingId":"201a6b51-cb4f-46c7-ac23-b2f9bd957017","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/393 \\\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 with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/393"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without account registration","Agent-driven API consumption with per-call USDC micropayments on Base","Accessing data, AI, finance, or utility services with no rate limits"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access","Users who prefer crypto micropayments over subscription billing","Quick prototyping without API key management"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where per-call pricing may add up","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.907Z"},"updatedAt":"2026-04-24T12:03:22.796Z"}}