{"id":"19864fe7-42c6-438f-8ccd-b3ce0547e228","shortId":"7kGvBU","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint listed here (`/api/v1/orders/72`) is described as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. This is consistent with the site-wide $0.02/request pricing shown on the landing page.\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). However, no OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl — the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","no-auth API"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet'","The specific endpoint /api/v1/orders/72 has a generic 'Premium API Access' description with no details on what it returns","No example request or response payloads could be found","The breadth of advertised capabilities (AI, finance, geocoding, etc.) could not be verified beyond the landing page listing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/72","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/72","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and all doc/pricing/README pages return only a wallet-connect prompt. The specific purpose of /api/v1/orders/72 ('Premium API Access') is vague and 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'/call':13,28 '/request':153 '0.02':12,27,59,138,152 '000':127 '0x8335':132 '20':126 '2913':133 '6':142 'Base network API' 'USDC API' 'accept':115 'access':113 'advertis':121,162 'ai':173 'ai-inference' 'ai/ml':49 'amount':124 'analysi':177 'analyt':48,167 'api':5,20,37,71,112,216 'attach':87 'base':8,23,67,128,135 'broad':42 'caller':86 'catalog':43 'categori':165 'challeng':120 'classif':180 'classification' 'commit':79 'connect':225 'consist':146 'content':231 'convers':197 'cost':58 'crawl':213 'crypto-quotes' 'data':47,52,166,170 'data-analytics' 'decim':143 'describ':109 'detail':203 'doc':215 'document':204 'embed':181 'embeddings' 'enabl':36 'endpoint':45,57,104,164 'equal':137 'estim':191 'everi':56 'exampl':206 'exchang':186 'export':171 'feed':185 'financ':182 'finance-data' 'finance/web3':51 'found':210 'four':163 'gas':190 'generat':198 'geocod':195 'geocoding' 'given':139 'handl':83 'header':90 'howev':199 'http':93 'immedi':99 'infer':50 'infrastructur':193 'inlin':85 'insight':172 'key':72 'land':158 'learn':175 'limit':75 'list':105 'low payment fee' 'lowpaymentfee.com':31 'machin':174 'maximum':123 'metric':168 'micropayment API' 'network':9,24,68 'no-auth API' 'offer':40 'openapi':201 'page':159,220 'paid':62 'pay':2,17 'pay per call API' 'pay-per-request':1,16 'payload':208 'payment':84,89 'per':3,18,60 'platform':6,21,38,161 'post':116 'premium':111 'price':154,184,217 'prompt':227 'protocol':82 'quot':189 'rate':74,187 'readm':219 'receiv':96 'report':169 'request':4,19,61,94,117 'request/response':207 'respons':98 'return':222 'schema':202 'sentiment':176 'sentiment-analysis' 'servic':55 'settlement':101 'shown':155 'site':150 'site-wid':149 'span':46 'specif':103 'substant':230 'summar':179 'text':178 'text-summarization' 'token':188 'unit':129 'upfront':78 'upon':100 'usdc':15,30,64,131,140 'usdc-base' 'util':54,194 'utility-services' 'valid':196 'via':10,25 'wallet':226 'web3':183 'wide':151 'x402':11,26,35,81,119 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b1d6bd30-408c-46f9-9fe4-da6fc281958b","listingId":"19864fe7-42c6-438f-8ccd-b3ce0547e228","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:47.344Z"}],"sources":[{"listingId":"19864fe7-42c6-438f-8ccd-b3ce0547e228","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:47.344Z","lastSeenAt":"2026-04-23T00:31:03.793Z"}],"details":{"listingId":"19864fe7-42c6-438f-8ccd-b3ce0547e228","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/72 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/orders/72 advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/72"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/orders/72"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval with inline USDC micropayments","On-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto quotes and gas estimates via pay-per-request","Geocoding and data conversion as utility microservices"],"bestFor":["Developers and agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Use cases requiring low-cost, high-frequency API calls without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring guaranteed SLAs or enterprise support","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:17:54.153Z"},"updatedAt":"2026-04-23T00:31:03.793Z"}}