{"id":"6763d88a-d39e-419c-be38-69fd0820fe08","shortId":"y8g4wY","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","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 general utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/policies/42` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform lists roughly 16 endpoints across four categories: 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 utilities (geocoding, validation, conversion, 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 (returns a proper 402 challenge), but without documentation it is unclear what request body `/api/v1/policies/42` expects or what response it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats for any endpoint","The specific purpose of /api/v1/policies/42 ('Premium API Access') is not explained anywhere","Cannot verify what data or functionality any of the listed endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/42","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/42","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 and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of '/api/v1/policies/42' specifically is unclear. Score reflects a live but essentially undocumented 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'/api/v1/policies/42':93,239 '/docs':186 '/pricing':187 '/readme':190 '/request':18,36 '0.02':17,35,124,178 '000':113 '0x8335':118 '16':136 '20':112 '2913':119 '402':228 '402 payment api' '6':129 'accept':101 'access':99 'across':138 'advertis':107 'ai':12,30,148 'ai-inference' 'ai/ml':55 'analysi':152 'analyt':11,29,54,142 'api':5,23,43,80,98 'avail':216 'base':8,26,73,114,121 'base network api' 'bodi':238 'broad':48 'broader':132 'call':4,22,126 'catalog':49 'categori':140 'challeng':106,229 'classif':155 'classification' 'confirm':223 'connect':196 'content':202 'convers':172 'cost':110 'cover':10,28 'crawl':219 'data':53,58,141,145 'data-analytics' 'decim':130 'document':181,211,232 'embed':156 'embeddings' 'enabl':42 'endpoint':51,63,91,137,221 'equal':123 'estim':166 'exampl':215 'exchang':161 'expect':240 'export':146 'extrem':183 'feed':160 'financ':13,31,157 'finance-data' 'finance/web3':57 'four':139 'gas':165 'general':60 'generat':173 'geocod':170 'geocoding' 'infer':56 'infrastructur':168 'insight':147 'key':81 'learn':150 'limit':84 'list':95,134 'live':224 'low payment fee' 'lowpaymentfee.com':37 'machin':149 'maximum':109 'metric':143 'micropayment api' 'network':74 'no-api-key' 'offer':46 'openapi':206 'page':191 'paid':65 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'per':3,21,67,125 'per-request':66 'per-request-billing' 'platform':6,24,44,133 'point':180 'post':102 'premium':97 'price':159,179 'prompt':198 'proper':227 'protocol':78 'quot':164 'rate':83,162 'render':193 'report':144 'request':68,103,237 'request/response':209 'requir':88 'respons':243 'return':225,245 'rough':135 'schema':210 'sentiment':151 'sentiment-analysis' 'span':52 'spars':184 'spec':207 'specif':90 'subscript':87 'summar':154 'text':153 'text-summarization' 'token':163 'unclear':235 'unit':115 'usag':214 'usdc':9,27,70,117,127 'usdc api' 'usdc-base' 'use':69,128 'util':15,33,61,169 'valid':171 'via':75 'wallet':197 'web3':158 'without':231 'x402':41,77,105 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"d038307e-43a9-42e9-9123-e7e7439f5b68","listingId":"6763d88a-d39e-419c-be38-69fd0820fe08","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:55.943Z"}],"sources":[{"listingId":"6763d88a-d39e-419c-be38-69fd0820fe08","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:55.943Z","lastSeenAt":"2026-04-22T15:01:44.382Z"}],"details":{"listingId":"6763d88a-d39e-419c-be38-69fd0820fe08","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/42"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/42"},{"claim":"Platform lists ~16 endpoints across analytics, AI, finance, and utility categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, api, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data like token quotes, gas estimates, or exchange rates with per-call payment","Running analytics queries or exporting data with no subscription commitment","Geocoding, validation, or data conversion as utility microservices"],"bestFor":["AI agents or bots that need keyless, pay-as-you-go API access","Developers prototyping with multiple API categories without signup friction","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, schemas, or SLAs before integrating","Teams without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.698Z"},"updatedAt":"2026-04-22T15:01:44.382Z"}}