{"id":"e1aa2685-f3ff-4dc3-a6eb-56d95c6a7e72","shortId":"agEm8T","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/charges/252` is labeled \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. However, the crawled documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content, so the actual behavior, request/response schemas, and data sources behind these endpoints remain undocumented.\n\nThe `/api/v1/charges/252` endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme \"exact\" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests. Without documentation or example responses, it is unclear what data this specific charge endpoint returns versus the other named endpoints on the platform.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment api"],"warnings":["No API documentation available — docs, pricing, and README pages are empty beyond a wallet-connect prompt","No request or response schema provided for any endpoint","The specific endpoint /api/v1/charges/252 does not match any of the named API routes listed on the homepage; its actual functionality is unknown","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/252","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/252","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 challenge, but there is no documentation, no request/response schema, and no examples. The docs, pricing, and README pages all returned only a wallet-connect prompt. The purpose of the specific /charges/252 endpoint versus the named API routes is 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'/request':19,38,157 '0.02':18,37,79,156 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':215 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':218 '20':82 '402':204 '402 payment api' '6':89 'accept':221 'access':74 'actual':180 'address':214 'advertis':113 'ai':12,31,124 'ai-inference' 'analysi':128 'analyt':118 'api':5,24,45,73,92 'attach':103 'base':8,27,63,84,210 'base network api' 'base-network' 'behavior':181 'behind':187 'broad':50 'call':4,23,81 'caller':101 'catalog':51 'categori':116 'challeng':202 'charg':236 'classif':131 'commit':98 'connect':172 'content':177 'convers':148 'cost':76 'crawl':161 'crypto api access' 'data':11,30,117,121,185,233 'data-analytics' 'decim':90 'doc':164 'document':162,225 'embed':132 'embeddings' 'enabl':44 'endpoint':16,35,57,67,115,152,189,194,220,237,243 'estim':142 'exact':207 'exampl':227 'exchang':137 'export':122 'feed':136 'financ':13,32,133 'finance-data' 'four':114 'gas':141 'generat':149 'geocod':146 'geocoding' 'header':107 'howev':159 'http':203 'infrastructur':144 'insight':123 'key':93 'label':71 'learn':126 'limit':95 'list':151 'live':196 'low payment fee' 'lowpaymentfee.com':39 'machin':125 'metric':119 'micropayment api' 'name':242 'network':64,211 'no-api-key' 'offer':10,29 'page':163 'pay':2,21,54,212 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':106 'per':3,22,55,80 'platform':6,25,46,112,246 'post':222 'premium':72 'price':135,158,165 'prompt':173 'provid':48 'quot':140 'rate':94,138 'readm':166 'remain':190 'report':120 'request':56,110,223 'request/response':182 'requir':100 'respons':228 'return':167,198,238 'schema':183 'scheme':206 'sentiment':127 'sentiment-analysis' 'settl':58 'share':153 'simpli':102 'sourc':186 'specif':66,235 'substant':176 'summar':130 'text':129 'text-summarization' 'token':139 'unclear':231 'undocu':191 'unit':85 'upfront':97 'usdc':9,28,60,87,217 'usdc api' 'usdc-settlement' 'util':15,34,145 'valid':147,200 'versus':239 'wallet':171 'wallet-connect':170 'web3':134 'without':224 'x402':43,105,201 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"64f4b3af-d343-43bc-8d2c-d2b3df4820d0","listingId":"e1aa2685-f3ff-4dc3-a6eb-56d95c6a7e72","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/252","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:46.052Z"}],"sources":[{"listingId":"e1aa2685-f3ff-4dc3-a6eb-56d95c6a7e72","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/252","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:46.052Z","lastSeenAt":"2026-04-23T09:31:00.601Z"}],"details":{"listingId":"e1aa2685-f3ff-4dc3-a6eb-56d95c6a7e72","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/252 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/252"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/252"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto gas estimates or token price quotes with per-call USDC micropayments","Geocoding or data validation as a utility service paid per request on Base"],"bestFor":["Developers and agents wanting zero-commitment, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Use cases requiring small, infrequent API calls where subscription pricing is wasteful"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers without USDC on Base or x402 payment capability"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.534Z"},"updatedAt":"2026-04-23T09:31:00.601Z"}}