{"id":"ebe3250b-b806-43b3-ab00-f5deb96826c5","shortId":"rscQn4","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call 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, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/policies/20` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 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. The broader platform also exposes endpoints for 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.\n\nDocumentation is extremely sparse: 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 crawl. The endpoint is confirmed live (402 challenge returned), but without documentation it is unclear what input the `/api/v1/policies/20` endpoint expects or what its response payload looks like.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/policies/20 is undocumented","The broader platform lists many endpoints but none have documented request/response formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/20","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/policies/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages render only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific /api/v1/policies/20 endpoint is unclear beyond its generic 'Premium API Access' 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'/api/v1/policies/20':96,226 '/call':13,28 '/docs':175 '/pricing':176 '/readme':179 '0.02':12,27,64,123,167 '000':112 '0x8335':117 '20':111 '2913':118 '402':214 '6':127 'accept':131 'access':102 'advertis':107 'ai-inference' 'ai/ml':49 'also':140 'analysi':145 'analyt':48 'api':5,20,37,74,101 'application/json':136 'attach':84 'avail':205 'base':8,23,71,113,120 'base network api' 'broad':42 'broader':138 'caller':82 'catalog':43 'challeng':106,215 'classif':148 'classification' 'confirm':212 'connect':185 'content':191 'convers':160 'crawl':208 'crypto-data' 'data':47,52 'data-analytics' 'decim':128 'document':170,200,219 'embed':149 'embeddings' 'enabl':36 'endpoint':45,57,94,130,142,210,227 'equal':122 'estim':157 'exampl':204 'exchang':152 'expect':228 'expos':141 'extrem':172 'feed':151 'finance-data' 'finance/web3':51 'gas':156 'generat':162 'geocod':158 'geocoding' 'given':124 'header':88 'infer':50 'input':224 'key':75 'like':235 'limit':77 'list':98 'live':213 'look':234 'low payment fee' 'lowpaymentfee.com':31 'maxamountrequir':109 'micropayment api' 'network':9,24,72 'no-auth api' 'offer':40 'openapi':195 'page':180 'pay':2,17,60 'pay per call api' 'pay-per-request':1,16,59 'payload':233 'payment':87 'per':3,18,61 'platform':6,21,38,139 'point':169 'post':132 'premium':100 'price':150,168 'prompt':187 'quot':155 'rate':76,153 'render':182 'request':4,19,62,91,133 'request/response':198 'requir':81 'respons':232 'return':135,216 'schema':199 'sentiment':144 'sentiment-analysis' 'servic':55 'settl':66 'simpli':83 'span':46 'spars':173 'spec':196 'specif':93 'subscript':79 'summar':147 'text':146 'text-summarization' 'token':154 'unclear':222 'unit':114 'usag':203 'usdc':15,30,68,116,125 'usdc api' 'usdc-base' 'util':54 'utility-services' 'valid':159 'via':10,25 'wallet':186 'without':218 'x402':11,26,35,86,105 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d502ff91-af51-45db-ba1f-2141505bb64f","listingId":"ebe3250b-b806-43b3-ab00-f5deb96826c5","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/policies/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:55.325Z"}],"sources":[{"listingId":"ebe3250b-b806-43b3-ab00-f5deb96826c5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:55.325Z","lastSeenAt":"2026-04-23T02:31:34.709Z"}],"details":{"listingId":"ebe3250b-b806-43b3-ab00-f5deb96826c5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/20 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/20"},{"claim":"All endpoints are 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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/20"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility microservice paid in USDC on Base"],"bestFor":["AI agents that need keyless, pay-per-request access to diverse API endpoints","Developers wanting to avoid subscription commitments for low-volume API usage","Web3-native applications settling microtransactions on Base L2"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.703Z"},"updatedAt":"2026-04-23T02:31:34.709Z"}}