{"id":"503dc9ff-5af9-466b-a521-6009633dd98c","shortId":"gQ7Pwh","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform uses the x402 payment protocol, meaning no API keys, accounts, or rate limits are needed — callers simply attach an X-PAYMENT header with a signed USDC payment to each request.\n\nThe specific endpoint listed here (`/api/v1/customers/22`) is labeled \"Premium API Access\" and returns JSON. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual behavior, request schemas, and response formats of these endpoints are undocumented. The specific purpose of the `/api/v1/customers/22` resource is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No API documentation available — all doc/pricing/README pages are empty stubs showing only 'Connect wallet'","The specific purpose and expected request/response format of /api/v1/customers/22 ('Premium API Access') is undocumented","No OpenAPI spec or request/response schema provided","The broad range of advertised endpoints (AI, finance, geo, etc.) cannot be verified from available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/22","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/customers/22","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), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of /api/v1/customers/22 is unexplained. All doc pages return only 'Connect wallet' with no useful 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'/request':13,30 '0.02':12,29,66,141,192 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':136 '20':130 '300':155 '402 payment API' '6':145 'Base network API' 'USDC API' 'access':119 'account':87 'across':49 'actual':214 'address':151 'advertis':126,161 'ai':52 'ai-inference' 'analysi':170 'analyt':51 'api':5,15,22,32,41,85,118 'attach':95 'avail':236 'base':8,25,74,132,138 'behavior':215 'beyond':197 'broader':159 'call':4,21 'caller':93 'categori':60 'challeng':125 'classif':173 'connect':210 'convers':185 'data':50,166 'data-analytics' 'decim':146 'document':196 'embed':174 'empti':203 'enabl':40 'endpoint':48,62,111,162,223 'equal':140 'essenti':202 'estim':182 'exchang':177 'export':167 'feed':176 'financ':55 'finance-data' 'format':220 'gas':181 'generat':187 'geocod':183 'given':142 'header':100 'howev':195 'infrastructur':58 'insight':168 'json':122 'json-response' 'key':16,33,86 'label':116 'land':199 'learn':54 'limit':90 'list':112 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':53 'materi':237 'maxamountrequir':128 'mean':83 'metric':164 'micropayment API' 'need':92 'network':75 'no-api-key' 'offer':44 'page':200,207 'paid':69 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':81,99,105,147 'per':3,20,67 'platform':6,23,42,77,160 'point':194 'premium':117 'price':64,175,193 'protocol':82 'purpos':228 'quot':180 'rate':89,178 'report':165 'request':68,108,216 'requir':17,34 'resourc':232 'respons':219 'return':121 'schema':217 'second':156 'sent':149 'sentiment':169 'show':209 'sign':103 'simpli':94 'specif':110,227 'sub':206 'sub-pag':205 'summar':172 'text':171 'timeout':157 'token':179 'unclear':234 'undocu':225 'unit':133 'usdc':9,26,71,104,135,143 'usdc-base' 'use':78 'util':59 'utility-services' 'valid':184 'varieti':46 'via':10,27 'wallet':211 'web3':56 'x':98 'x-payment':97 'x402':11,28,39,80,124 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"d855b511-413e-48d7-8473-eb2fc1c9a474","listingId":"503dc9ff-5af9-466b-a521-6009633dd98c","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/customers/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:10.141Z"}],"sources":[{"listingId":"503dc9ff-5af9-466b-a521-6009633dd98c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:10.141Z","lastSeenAt":"2026-04-23T16:06:39.789Z"}],"details":{"listingId":"503dc9ff-5af9-466b-a521-6009633dd98c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/22 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/customers/22"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain no useful content beyond 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics and reporting endpoints without managing API keys","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Fetching financial data like price feeds, exchange rates, and gas estimates via micropayments","Using utility services like geocoding, validation, and conversion with instant pay-per-use"],"bestFor":["Developers who want instant API access without signup or key management","Agents and bots that can settle USDC payments on Base per request","Low-volume or sporadic API consumers who prefer pay-per-call over subscriptions"],"notFor":["High-volume consumers who need bulk pricing or rate guarantees","Users who need detailed API documentation, request/response schemas, or SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.695Z"},"updatedAt":"2026-04-23T16:06:39.789Z"}}