{"id":"2330c6b5-cfbd-4845-8a97-3ac7e8acc01f","shortId":"QKgbFE","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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transactions/7` 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.\n\nThe platform advertises four categories of APIs: 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 (geocoding, validation, conversion, generation). All endpoints follow the x402 payment protocol — callers send an `X-PAYMENT` header with a signed payment to the provider's address on Base, and receive the API response upon successful settlement.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual behavior and output format of `/api/v1/transactions/7` (or any other endpoint) cannot be determined from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","no-auth API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available for any endpoint","The specific purpose and expected input/output of /api/v1/transactions/7 is unknown — 'Premium API Access' is not descriptive","No request or response examples available anywhere in crawled materials","Cannot verify that any of the advertised API categories actually return meaningful data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/7","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/7","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 it accepts USDC payments on Base. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/transactions/7' specifically is unclear beyond the generic 'Premium API Access' label. The platform lists many endpoints but provides no detail on any of 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'/request':13,28 '0.02':12,27,59,106 '000':100 '20':99 '402':94 '6':110 'Base network API' 'USDC API' 'access':90 'actual':224 'address':175 'advertis':116 'ai':128 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':132 'analyt':48,122 'api':5,20,37,71,89,120,181,192 'avail':239 'base':8,23,67,101,113,177 'behavior':225 'broad':42 'call':4,19 'caller':160 'cannot':235 'categori':118 'challeng':95 'classif':135 'commit':78 'connect':201 'content':207 'convers':151 'conversion' 'cost':58 'crypto-gas-estimates' 'data':47,52,121,125 'data-analytics' 'decim':111 'detail':218 'determin':237 'doc':191 'document':186,219 'embed':136 'enabl':36 'endpoint':45,57,82,154,222,234 'estim':146 'everi':56 'exampl':215 'exchang':141 'exchange-rates' 'export':126 'extrem':188 'feed':140 'financ':137 'finance-price-feeds' 'finance/web3':51 'follow':155 'format':228 'four':117 'gas':145 'generat':152 'geocod':149 'geocoding' 'header':166 'i.e':105 'infer':50 'infrastructur':54,148 'insight':127 'key':72 'learn':130 'limit':75 'list':86 'low payment fee' 'lowpaymentfee.com':31 'machin':129 'materi':240 'metric':123 'micropayment API' 'network':9,24,68 'no-auth API' 'offer':40 'openapi':211 'output':227 'page':196 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':158,165,170 'per':3,18,60 'platform':6,21,38,115 'premium':88 'price':139,193 'prompt':203 'protocol':159 'provid':173 'quot':144 'rate':74,142 'readm':195 'receiv':179 'render':198 'report':124 'request':61,96 'request/response':214 'requir':79 'respons':182 'return':92 'schema':212 'send':161 'sentiment':131 'set':43 'settlement':185 'sign':169 'sinc':107 'span':46 'spars':189 'specif':81 'success':184 'summar':134 'text':133 'token':143 'unit':102 'upon':183 'usdc':15,30,64,104,108 'usdc-base-network' 'use':109 'util':55 'valid':150 'validation' 'via':10,25 'wallet':202 'web3':138 'x':164 'x-payment':163 'x402':11,26,35,157 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"76d35dd5-e5c1-4352-a055-1480aadaf4ad","listingId":"2330c6b5-cfbd-4845-8a97-3ac7e8acc01f","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:00.367Z"}],"sources":[{"listingId":"2330c6b5-cfbd-4845-8a97-3ac7e8acc01f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:00.367Z","lastSeenAt":"2026-04-22T10:02:29.295Z"}],"details":{"listingId":"2330c6b5-cfbd-4845-8a97-3ac7e8acc01f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/7 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transactions/7"},{"claim":"All endpoints cost $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 in four 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 further 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 like token prices, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with per-request USDC micropayments","Using utility services like geocoding, validation, and conversion via x402 payment"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring micropayment-gated endpoints on Base L2","Projects that need a variety of lightweight API services without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring high-throughput bulk access at lower per-unit cost","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.322Z"},"updatedAt":"2026-04-22T10:02:29.295Z"}}