{"id":"00b6e99d-7c84-4c69-9b41-e53904be6015","shortId":"bjkPtM","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is a multi-category API platform that uses the x402 payment protocol on the Base network to charge per request in USDC. The specific endpoint `/api/v1/orders/56` is labeled \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment to access the resource.\n\nThe broader 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. Payment settles in USDC on the Base L2 network using the exact-amount scheme.\n\nThe specific endpoint probed (`/api/v1/orders/56`) returned a live 402 challenge confirming it accepts POST requests and returns application/json. However, documentation beyond the landing page is essentially empty (docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt), so the actual request/response schemas for this and other endpoints are unknown.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","data","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) are all empty — only a 'Connect wallet' prompt is rendered.","No OpenAPI or schema available; request body format and response structure are completely unknown.","The specific endpoint /api/v1/orders/56 is not listed among the advertised API categories on the landing page, so its actual function is unclear.","No information about uptime, SLAs, or data sources behind any of the endpoints."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/56","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/56","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 pricing and network. However, there is no OpenAPI spec, no request/response schema documentation, and all doc pages are empty stubs. The purpose of '/api/v1/orders/56' specifically is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/call':19,38 '/request':164 '0.02':18,37,76,91,163 '000':82 '20':81 '402':189 '6':89 'Base network API' 'USDC API' 'accept':193 'access':71,114 'actual':223 'advertis':99,120 'ai':12,31,131 'amount':179 'analysi':135 'analyt':125 'api':5,24,45,70,93,210 'application/json':198 'attach':102 'base':8,27,55,83,172 'beyond':201 'broader':118 'call':78 'caller':100 'categori':44,123 'challeng':190 'charg':58 'classif':138 'confirm':191 'connect':218 'convers':155 'cost':73 'data':11,30,124,128 'decim':90 'doc':208 'document':200 'embed':139 'empti':207 'endpoint':16,35,65,122,159,183,230 'essenti':206 'estim':149 'exact':178 'exact-amount':177 'exchang':144 'export':129 'feed':143 'financ':13,32,140 'four':121 'gas':148 'generat':156 'geocod':153 'header':107 'howev':199 'infrastructur':151 'insight':130 'json-response' 'key':94 'l2':173 'label':68 'land':203 'learn':133 'limit':97 'list':158 'live':188 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':132 'maxamountrequir':79 'metric':126 'micropayment API' 'multi':43 'multi-categori':42 'network':56,174 'no-api-key' 'no-rate-limit' 'page':204,213 'pay':2,21 'pay-per-call API' 'pay-per-request':1,20 'payment':51,106,112,166 'per':3,22,59,77 'per-request-billing' 'platform':46,119 'post':194 'post-endpoint' 'premium':69 'price':142,165,209 'probe':184 'prompt':220 'protocol':52 'quot':147 'rate':96,145 'readm':212 'render':215 'report':127 'request':4,23,60,195 'request/response':224 'resourc':116 'return':186,197 'schema':225 'scheme':180 'sentiment':134 'settl':167 'share':160 'simpli':101 'specif':64,182 'suit':6,25 'summar':137 'text':136 'token':146 'unit':84 'unknown':232 'usdc':62,86,169 'usdc-base' 'use':48,175 'util':15,34,152 'valid':110,154 'via':9,28 'wallet':219 'web3':141 'x':105 'x-payment':104 'x402':10,29,50,111 'x402 API' 'x402-payment'","prices":[{"id":"171be42e-40f2-453e-963f-d3a2d6958803","listingId":"00b6e99d-7c84-4c69-9b41-e53904be6015","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:53.961Z"}],"sources":[{"listingId":"00b6e99d-7c84-4c69-9b41-e53904be6015","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:53.961Z","lastSeenAt":"2026-04-23T19:00:36.697Z"}],"details":{"listingId":"00b6e99d-7c84-4c69-9b41-e53904be6015","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/56 \\\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 listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/orders/56 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/orders/56"},{"claim":"The platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Pay-as-you-go data analytics or AI inference from an autonomous agent","Crypto-native applications needing utility endpoints (geocoding, validation) settled in USDC"],"bestFor":["AI agents with x402-compatible wallets on Base","Developers wanting zero-signup, per-call API access","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation or OpenAPI specs before integrating","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:52.281Z"},"updatedAt":"2026-04-23T19:00:36.697Z"}}