{"id":"71e56fc9-e158-4769-a961-941eb85331f4","shortId":"MSKQnr","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, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/charges/42` is labeled \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts POST requests and returns application/json.\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 spec, no request/response schema documentation, and no usage examples available. The exact functionality behind the `/api/v1/charges/42` \"Premium API Access\" endpoint is unclear; it may be a generic charge endpoint or a specific resource. Without documentation, callers will need to experiment to determine the expected request body and response format.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","sentiment-analysis","text-summarization","classification","embeddings","data-analytics","price-feeds","exchange-rates","gas-estimates","geocoding","no-api-key"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto-paid API","serverless API billing"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt — no usable docs available.","No OpenAPI or schema definition found; request body and response format for this endpoint are unknown.","The specific purpose of /api/v1/charges/42 ('Premium API Access') is not explained anywhere — it may be a generic or placeholder endpoint.","The site lists many endpoints but none have detailed documentation; actual functionality is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/42","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of '/api/v1/charges/42' specifically is unclear. Pricing is clear ($0.02/request in USDC on 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'/api/v1/charges/42':113,212 '/docs':176 '/pricing':178 '/readme':180 '/request':19,38 '0.02':18,37,99,134 '000':129 '20':128 '6':139 'Base network API' 'USDC API' 'accept':165 'access':118,215 'across':58 'ai':12,31,68 'analysi':72 'analyt':62 'api':5,24,45,117,153,214 'application/json':170 'avail':206 'base':8,27,107,130,142 'behind':210 'bodi':242 'broad':50 'call':4,23 'caller':232 'catalog':51 'categori':60 'challeng':124 'charg':224 'classif':75 'classification' 'commit':161 'connect':186 'content':192 'convers':92 'crypto-paid API' 'data':11,30,61,65 'data-analytics' 'decim':140 'determin':238 'document':171,201,231 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,164,216,225 'estim':86 'exact':149,208 'exampl':205 'exchang':81 'exchange-rates' 'expect':240 'experi':236 'export':66 'extrem':173 'feed':80 'financ':13,32,77 'format':245 'four':59 'function':209 'gas':85 'gas-estimates' 'generat':93 'generic':223 'geocod':90 'geocoding' 'infrastructur':88 'insight':67 'key':154 'label':115 'learn':70 'limit':157 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':145 'may':220 'metric':63 'micropayment API' 'need':234 'network':108 'no-api-key' 'offer':48 'openapi':196 'page':181 'paid':102 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':143 'per':3,22,55,100 'platform':6,25,46 'post':166 'premium':116,213 'price':79,97 'price-feeds' 'prompt':188 'quot':84 'rate':82,156 'render':183 'report':64 'request':56,101,125,167,241 'request/response':199 'requir':162 'resourc':229 'respons':244 'return':120,169 'schema':200 'scheme':150 'sentiment':71 'sentiment-analysis' 'serverless API billing' 'sinc':136 'spars':174 'spec':197 'specif':110,228 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':218 'unit':131 'upfront':160 'usag':204 'usd':135 'usdc':104,133,137 'usdc-base' 'use':138 'util':15,34,89 'valid':91,122 'via':9,28,146 'wallet':187 'web3':78 'without':230 'x402':10,29,43,123,148 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2321fbf4-c753-48fe-81b7-cda46b2a12fd","listingId":"71e56fc9-e158-4769-a961-941eb85331f4","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:18.098Z"}],"sources":[{"listingId":"71e56fc9-e158-4769-a961-941eb85331f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:18.098Z","lastSeenAt":"2026-04-23T08:01:18.694Z"}],"details":{"listingId":"71e56fc9-e158-4769-a961-941eb85331f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/42"},{"claim":"All listed endpoints are 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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/42"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto price feeds and gas estimates with per-call USDC payments","Running geocoding or data validation requests on a pay-as-you-go basis","Exporting analytics data or generating reports without subscription commitments"],"bestFor":["Developers who want instant API access without registration or API keys","Agents and bots that can settle x402 payments in USDC on Base","Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.986Z"},"updatedAt":"2026-04-23T08:01:18.694Z"}}