{"id":"1cc246d8-e62e-440a-aab9-1a34654f1061","shortId":"t2gY2X","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request 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. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/262` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base. The payment scheme is \"exact\" with a 300-second timeout. The broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation.\n\nDocumentation is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual behavior and response format of this specific endpoint (and the other listed endpoints) cannot be verified from the available information.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific purpose and response format of /api/v1/transactions/262 ('Premium API Access') is undocumented and unclear","Cannot verify that the advertised AI, analytics, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/262","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/transactions/262","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The actual functionality behind 'Premium API Access' at /api/v1/transactions/262 is completely 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'/api/v1/transactions/262':96 '/docs':171 '/pricing':172 '/readme':175 '/request':13,28 '0.02':12,27,64,118 '000':112 '20':111 '300':133 '402':106 '6':122 'Base network API' 'USDC API' 'access':102 'account':76 'actual':207 'advertis':139 'ai-inference' 'ai/ml':49 'analysi':148 'analyt':48 'api':5,20,37,74,101 'attach':84 'avail':201,226 'base':8,23,71,113,125 'base-network' 'behavior':208 'broad':42 'broader':137 'call':4,19 'caller':82 'cannot':221 'catalog':43 'categori':140 'challeng':107 'classif':151 'classification' 'connect':181 'content':187 'convers':163 'crawl':204 'crypto-paid API' 'data':47,52,144 'data-analytics' 'decim':123 'document':166,196 'embed':152 'embeddings' 'enabl':36 'endpoint':45,57,94,215,220 'estim':160 'exact':130 'exampl':200 'exchang':155 'export':145 'extrem':168 'feed':154 'finance-data' 'finance/web3':51 'format':211 'gas':159 'generat':165 'geocod':161 'geocoding' 'header':88 'i.e':117 'includ':141 'infer':50 'inform':227 'insight':146 'key':75 'limit':79 'list':98,219 'low fee API' 'lowpaymentfee.com':31 'materi':205 'metric':142 'micropayment API' 'network':9,24,72 'no-api-key' 'offer':40 'openapi':191 'page':176 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,127 'per':3,18,61 'platform':6,21,38,138 'premium':100 'price':153 'prompt':183 'quot':158 'rate':78,156 'render':178 'report':143 'request':62,91,108 'request/response':194 'requir':81 'respons':210 'return':104 'schema':195 'scheme':128 'second':134 'sentiment':147 'sentiment-analysis' 'servic':55 'settl':66 'simpli':83 'sinc':119 'span':46 'spec':192 'specif':93,214 'summar':150 'text':149 'text-summarization' 'thin':169 'timeout':135 'token':157 'unit':114 'usag':199 'usdc':15,30,68,116,120 'usdc-settlement' 'use':121 'util':54 'utility-services' 'valid':162 'verifi':223 'via':10,25 'wallet':182 'x402':11,26,35,86 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"6162d862-1202-476f-834a-28c45ebf3f2b","listingId":"1cc246d8-e62e-440a-aab9-1a34654f1061","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/transactions/262","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:40.900Z"}],"sources":[{"listingId":"1cc246d8-e62e-440a-aab9-1a34654f1061","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/262","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:40.900Z","lastSeenAt":"2026-04-22T20:01:38.658Z"}],"details":{"listingId":"1cc246d8-e62e-440a-aab9-1a34654f1061","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/262 \\\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":"Platform advertises $0.02/request pricing 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/transactions/262"},{"claim":"Platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto quotes with per-request USDC micropayments","Running utility operations like geocoding, validation, and data conversion on a pay-as-you-go basis","Exporting data or generating analytics reports without subscription commitments"],"bestFor":["Agents or applications that need simple pay-per-call access without account setup","Developers who want to pay in USDC on Base for lightweight API calls","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, schemas, or SLAs before integrating","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.548Z"},"updatedAt":"2026-04-22T20:01:38.658Z"}}