{"id":"c9e34092-efd7-4d43-9aa8-aa30d7593cfd","shortId":"M5zjHn","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 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 upfront commitments. The x402 protocol handles payment inline: callers attach a cryptographic payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/transactions/321` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns `application/json`. Beyond this particular path, the platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation is extremely thin. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled pages. The actual behavior and response format of each endpoint must be discovered by making paid calls.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","data-export","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API gateway","serverless paid API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically by making paid calls","Docs, pricing, API, and README pages all render only 'Connect wallet' with no technical content","The specific endpoint path '/api/v1/transactions/321' is not listed on the homepage catalog — its purpose is unclear","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/321","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/321","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual functionality behind '/api/v1/transactions/321' is opaque — the name 'Premium API Access' is generic and 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'/request':13,28 '0.02':12,27,59,134,181 '000':123 '0x8335':128 '20':122 '2913':129 '6':138 'Base network API' 'USDC micropayment API' 'accept':142 'access':113 'actual':226 'advertis':154 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':158 'analyt':48 'api':5,20,37,71,112,191 'application/json':147 'attach':87 'avail':220 'base':8,23,67,124,131 'behavior':227 'beyond':148 'broad':42 'call':4,19,240 'caller':86 'catalog':43 'challeng':118 'classif':161 'commit':79 'connect':199 'convers':173 'conversion' 'cost':58 'crawl':223 'crypto API gateway' 'crypto-gas-estimates' 'cryptograph':89 'data':47,52,175 'data-analytics' 'data-export' 'decim':139 'detail':206 'discov':236 'doc':189 'document':184,215 'embed':162 'enabl':36 'endpoint':45,57,105,141,155,233 'equal':133 'estim':170 'everi':56 'exampl':219 'exchang':165 'exchange-rates' 'extrem':186 'feed':164 'finance-price-feeds' 'finance/web3':51 'format':230 'gas':169 'generat':176 'geocod':171 'geocoding' 'given':135 'handl':83 'header':91 'http':94 'immedi':100 'infer':50 'infrastructur':54 'inlin':85 'key':72 'limit':75 'list':109 'lowpaymentfee' 'lowpaymentfee.com':31 'make':238 'must':234 'network':9,24,68 'offer':40 'openapi':210 'page':194,224 'paid':62,239 'particular':150 'path':151 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,90 'per':3,18,60 'platform':6,21,38,153 'point':183 'post':143 'premium':111 'price':163,182,190 'prompt':201 'protocol':82 'quot':168 'rate':74,166 'readm':193 'receiv':97 'render':196 'request':61,95,119,144 'request/response':213 'respons':99,229 'return':115,146 'schema':214 'sentiment':157 'serverless paid API' 'settlement':102 'span':46 'spec':211 'specif':104 'summar':160 'technic':205 'text':159 'thin':187 'token':167 'unit':125 'upfront':78 'upon':101 'usag':218 'usdc':15,30,64,127,136 'usdc-base' 'util':55 'valid':172 'validation' 'via':10,25 'wallet':200 'x402':11,26,35,81,117 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"97cb0f60-590a-4277-ae2a-4700cf670540","listingId":"c9e34092-efd7-4d43-9aa8-aa30d7593cfd","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/321","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:03.512Z"}],"sources":[{"listingId":"c9e34092-efd7-4d43-9aa8-aa30d7593cfd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/321","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:03.512Z","lastSeenAt":"2026-04-22T20:01:39.915Z"}],"details":{"listingId":"c9e34092-efd7-4d43-9aa8-aa30d7593cfd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/321 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/321"},{"claim":"All listed 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 across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding or data validation utilities with instant USDC micropayments","Exporting analytics data or generating insights reports via pay-as-you-go endpoints"],"bestFor":["Agents or bots that need keyless, pay-per-call API access on Base","Developers wanting to prototype against multiple utility endpoints without signup","Web3-native applications that can settle USDC payments inline with HTTP requests"],"notFor":["High-volume production workloads where per-request crypto settlement adds latency or cost overhead","Users who need detailed API documentation, SLAs, or guaranteed uptime commitments","Applications that cannot handle x402 payment negotiation or lack a Base-compatible wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.955Z"},"updatedAt":"2026-04-22T20:01:39.915Z"}}