{"id":"3676a5ff-08d9-4188-8d23-8d56508f6405","shortId":"quKAkj","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a suite of 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 and settle in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/orders/58` is labeled \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required — callers simply attach an X-PAYMENT header to each request.\n\nDocumentation beyond the landing page is sparse; the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind the `/api/v1/orders/58` endpoint is unclear — it may be an order-retrieval or order-creation endpoint, but this is not documented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api","crypto api access"],"warnings":["No OpenAPI specification or request/response schema available","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no technical content","The specific functionality of /api/v1/orders/58 ('Premium API Access') is not documented — unclear what it returns or what input it expects","No usage examples or error handling documentation found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/58","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/orders/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/orders/58 is undocumented. Most doc pages return only a wallet-connect 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'/api/v1/orders/58':109,222 '/call':12,31 '/docs':182 '/pricing':183 '/readme':186 '0.02':11,30,94,138 '000':127 '0x8335':132 '20':126 '2913':133 '402 payment api' '6':142 'accept':116 'access':114 'across':53 'addit':197 'advertis':122 'ai':15,34,63 'ai-inference' 'analysi':67 'analyt':57 'api':5,24,45,113,154 'attach':165 'avail':213 'base':8,27,103,128,135 'base network api' 'base-network' 'behind':220 'beyond':175 'caller':163 'categori':55 'challeng':121 'classif':70 'classification' 'connect':192 'content':199 'convers':87 'crawl':216 'creation':236 'crypto api access' 'data':14,33,56,60 'data-analytics' 'decim':143 'document':174,208,242 'embed':71 'embeddings' 'enabl':44 'endpoint':19,38,52,90,107,223,237 'equal':137 'estim':81 'exact':150,218 'exampl':212 'exchang':76 'export':61 'feed':75 'financ':16,35,72 'finance-data' 'four':54 'function':219 'gas':80 'generat':88 'geocod':85 'geocoding' 'given':139 'header':170 'infrastructur':83 'insight':62 'key':155 'label':111 'land':177 'learn':65 'limit':158 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'made':146 'maxamountrequir':124 'may':227 'metric':58 'micropayment api' 'network':104 'no-api-key' 'offer':48 'openapi':203 'order':231,235 'order-cr':234 'order-retriev':230 'page':178,187 'pay':2,21 'pay per call api' 'pay-per-request':1,20 'payment':144,169 'per':3,22,95 'platform':6,25,46 'post':117 'premium':112 'price':74,92 'prompt':194 'quot':79 'rate':77,157 'render':189 'report':59 'request':4,23,96,118,173 'request/response':206 'requir':162 'retriev':232 'schema':207 'scheme':151 'sentiment':66 'sentiment-analysis' 'settl':98 'simpli':164 'spars':180 'spec':204 'specif':106 'subscript':161 'suit':50 'summar':69 'technic':198 'text':68 'text-summarization' 'token':78 'unclear':225 'unit':129 'usag':211 'usdc':100,131,140 'usdc api' 'usdc-settlement' 'util':18,37,84 'valid':86 'via':9,28,147 'wallet':193 'web3':73 'x':168 'x-payment':167 'x402':10,29,43,120,149 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ba868ff2-252c-4c59-a936-5410ac6b7ea1","listingId":"3676a5ff-08d9-4188-8d23-8d56508f6405","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/orders/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:15.252Z"}],"sources":[{"listingId":"3676a5ff-08d9-4188-8d23-8d56508f6405","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:15.252Z","lastSeenAt":"2026-04-22T19:30:50.549Z"}],"details":{"listingId":"3676a5ff-08d9-4188-8d23-8d56508f6405","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/58 \\\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 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":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/58"},{"claim":"Endpoint accepts POST method and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/orders/58"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with no subscription commitment","Using utility services like geocoding, validation, and conversion with instant crypto-settled access"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-volume bulk pricing or enterprise SLAs","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.451Z"},"updatedAt":"2026-04-22T19:30:50.549Z"}}