{"id":"60555395-eb59-407b-a7ef-610f603e663c","shortId":"FFG4pv","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/85` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST 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 data generation — all at the same $0.02 price point.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional technical detail. No OpenAPI spec, request/response schemas, or usage examples are published. Because of this, the exact input format and response structure for `/api/v1/messages/85` (and most other endpoints) must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages return only a 'Connect wallet' prompt with no useful content","The specific purpose and expected input/output of /api/v1/messages/85 is undocumented","No request or response examples could be sourced"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/85","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/messages/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The purpose of '/api/v1/messages/85' specifically is opaque — 'Premium API Access' is a generic label. Effectively a stub 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'/api/v1/messages/85':105,226 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,69,132,177 '000':121 '0x8335':126 '20':120 '2913':127 '6':136 'accept':140 'access':111 'addit':202 'advertis':115 'ai':12,31 'ai-inference' 'ai/ml':56 'also':149 'analysi':154 'analyt':55 'api':5,24,45,82,110 'application/json':145 'attach':93 'base':8,27,77,122,129 'base network api' 'beyond':181 'broader':147 'call':4,23 'caller':91 'challeng':114 'classif':157 'collect':50 'commit':90 'connect':197 'convers':169 'conversion' 'cost':118 'crypto-quotes' 'data':11,30,54,59,171 'data-analytics' 'decim':137 'detail':204 'discov':233 'document':180 'embed':158 'embeddings' 'enabl':44 'endpoint':16,35,52,65,103,139,151,230 'equal':131 'estim':166 'everi':64 'exact':219 'exampl':212 'exchang':161 'experiment':234 'expos':150 'feed':160 'financ':13,32 'finance-data' 'finance/web3':58 'format':221 'gas':165 'gas-estimates' 'general':61 'generat':172 'geocod':167 'geocoding' 'given':133 'header':97 'host':48 'http':141 'infer':57 'input':220 'key':83 'land':183 'limit':86 'list':107 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':117 'micropayment api' 'minimum':89 'must':231 'network':78 'offer':10,29 'openapi':206 'page':184,192 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':96 'per':3,22,70 'platform':6,25,46,148 'point':179 'post':142 'premium':109 'price':67,159,178 'prompt':199 'publish':214 'quot':164 'rate':85,162 'request':71,100 'request/response':208 'resolv':194 'respons':223 'return':144 'schema':209 'sentiment':153 'sentiment-analysis' 'servic':63 'settl':72 'simpli':92 'span':53 'spars':186 'spec':207 'specif':102 'structur':224 'summar':156 'technic':203 'text':155 'text-classification' 'text-summarization' 'token':163 'unit':123 'usag':211 'usdc':9,28,74,125,134 'usdc api' 'usdc-base' 'util':15,34,62 'valid':168 'validation' 'wallet':198 'x402':43,95,113 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"9b1e1c51-67f2-4e2f-8866-fc7af6b5650d","listingId":"60555395-eb59-407b-a7ef-610f603e663c","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/messages/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.921Z"}],"sources":[{"listingId":"60555395-eb59-407b-a7ef-610f603e663c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.921Z","lastSeenAt":"2026-04-22T02:32:07.966Z"}],"details":{"listingId":"60555395-eb59-407b-a7ef-610f603e663c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/85 \\\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 platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/85"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time crypto quotes and gas estimates via pay-as-you-go endpoints","Geocoding and data conversion utilities for automated pipelines"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","Crypto-native workflows that can attach x402 payment headers","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production use cases needing SLAs, rate-limit guarantees, or detailed documentation","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.194Z"},"updatedAt":"2026-04-22T02:32:07.966Z"}}