{"id":"45a21539-62c9-4b12-b7cb-bc6757e0160c","shortId":"C7aYjn","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 priced at $0.02 per request, payable in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/charges/333` is labeled \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys or rate limits required. The platform advertises instant access with no minimums or commitments.\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 examples of what any endpoint actually returns. The purpose of the `/api/v1/charges/333` endpoint specifically is unclear; it may be a generic test or demo charge endpoint rather than a functional data API. Without documentation or sample responses, it is impossible to confirm what payload this endpoint expects or returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema specification found for any endpoint","The endpoint /api/v1/charges/333 is not listed in the homepage catalog; its specific function is unknown","No request body schema or response examples are available anywhere","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/333","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/333","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 spec, no request/response examples, and the specific purpose of /api/v1/charges/333 is unclear. The catalog listing on the homepage does not include this endpoint, raising questions about what it actually 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'/api/v1/charges/333':113,211 '/docs':172 '/pricing':173 '/readme':176 '/request':19,38 '0.02':18,37,99,140 '000':129 '0x8335':134 '20':128 '2913':135 'access':118,161 'across':58 'actual':205 'advertis':159 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,117,151,231 'base':8,27,107,130,137 'base network api' 'broad':50 'call':4,23 'catalog':51 'categori':60 'challeng':124 'charg':224 'classif':75 'classification' 'commit':166 'confirm':241 'connect':182 'content':188 'convers':92 'data':11,30,61,65,230 'data-analytics' 'demo':223 'document':167,197,233 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,204,212,225,245 'equal':139 'estim':86 'exact':147 'exampl':200 'exchang':81 'expect':246 'export':66 'extrem':169 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':229 'gas':85 'generat':93 'generic':220 'geocod':90 'geocoding' 'imposs':239 'infrastructur':88 'insight':67 'instant':160 'key':152 'label':115 'learn':70 'limit':155 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':143 'may':217 'metric':63 'micropayment api' 'minimum':164 'network':108 'offer':48 'openapi':192 'page':177 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payabl':102 'payload':243 'payment':141 'per':3,22,55,100 'platform':6,25,46,158 'premium':116 'price':79,97 'prompt':184 'purpos':208 'quot':84 'rate':82,154 'rather':226 'render':179 'report':64 'request':56,101,125 'request/response':195 'requir':156 'respons':236 'return':120,206,248 'sampl':235 'schema':196 'scheme':148 'sentiment':71 'sentiment-analysis' 'spars':170 'spec':193 'specif':110,213 'summar':74 'test':221 'text':73 'text-summarization' 'token':83 'unclear':215 'unit':131 'usdc':104,133 'usdc api access' 'usdc-base' 'util':15,34,89 'utility-apis' 'valid':91,122 'via':9,28,144 'wallet':183 'web3':78 'without':232 'x402':10,29,43,123,146 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"19b2ce99-9427-442e-91d6-24fe27574f8d","listingId":"45a21539-62c9-4b12-b7cb-bc6757e0160c","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/333","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:06.060Z"}],"sources":[{"listingId":"45a21539-62c9-4b12-b7cb-bc6757e0160c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/333","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:06.060Z","lastSeenAt":"2026-04-23T08:01:18.176Z"}],"details":{"listingId":"45a21539-62c9-4b12-b7cb-bc6757e0160c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/333 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof to complete the request.","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/charges/333"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding or data validation with instant crypto-settled payments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access via crypto","Agents and bots that can settle x402 payments in USDC on Base","Prototyping and low-volume use cases where $0.02/call is acceptable"],"notFor":["High-volume production workloads needing SLAs, documentation, or guaranteed uptime","Users who need detailed API documentation, request/response schemas, or error handling guides"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.506Z"},"updatedAt":"2026-04-23T08:01:18.176Z"}}