{"id":"e32dca14-6656-4cc4-bd8d-163e0e7c3f0b","shortId":"AyGnDG","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe specific endpoint probed here (`/api/v1/auth/token`) is labeled \"Premium API Access\" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The broader platform advertises 16+ endpoints organized into 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).\n\nDocumentation is minimal — the landing page lists endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt with no additional content. Without schemas or sample payloads, it is unclear what inputs each endpoint expects or what shape the responses take.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","sentiment-analysis","text-summarization","text-classification","embeddings","analytics-metrics","data-export","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion","generation"],"categories":["llm","finance","geo","analytics"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","on-demand AI API"],"warnings":["No OpenAPI spec or request/response schemas available for any endpoint","Documentation pages (/api, /pricing, /README) are empty beyond a 'Connect wallet' prompt","Actual functionality behind listed endpoints (AI, analytics, finance, utilities) cannot be verified from available material","The probed endpoint is /api/v1/auth/token labeled 'Premium API Access' — its purpose relative to the other 16 listed endpoints is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/auth/token","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/auth/token","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, and the landing page confirms pricing and lists available endpoints. However, there are no request/response schemas, no OpenAPI spec, no usage examples, and no documentation beyond a brief landing page. The actual functionality behind each endpoint is 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'/api/v1/auth/token':112 '/pricing':201 '/readme':203 '/request':18,36 '0.02':17,35,67,134 '000':128 '16':141 '20':127 'Base network API' 'USDC API' 'access':117 'addit':215 'advertis':140 'ai':11,29,154 'ai/ml':55 'analysi':158 'analyt':12,30,54,148 'analytics-metrics' 'api':5,23,43,85,116 'attach':96 'bare':209 'base':8,26,75,129,136 'broad':48 'broader':138 'call':4,22 'caller':94 'categori':146 'challeng':123 'classif':161 'collect':49 'commit':93 'connect':210 'content':216 'convers':177 'conversion' 'cover':10,28 'crypto-paid API' 'data':53,58,147,151 'data-export' 'descript':195 'document':179 'embed':162 'embeddings' 'enabl':42 'endpoint':51,63,109,142,186,228 'estim':172 'everi':62 'exampl':198 'exchang':167 'exchange-rates' 'expect':229 'export':152 'feed':166 'financ':13,31,163 'finance/web3':57 'four':145 'gas':171 'gas-estimates' 'general':60 'generat':178 'generation' 'geocod':175 'geocoding' 'header':101 'i.e':133 'infer':56 'infrastructure/utilities':174 'input':226 'insight':153 'key':86 'label':114 'land':183 'learn':156 'limit':89 'list':185 'low fee API' 'lowpaymentfee.com':37 'machin':155 'metric':149 'micropayment API' 'minim':181 'minimum':92 'network':76 'offer':46 'on-demand AI API' 'organ':143 'page':184,204 'paramet':194 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'payload':221 'payment':80,100,105 'per':3,21,68 'per-request-billing' 'platform':44,139 'premium':115 'price':65,165,188 'price-feeds' 'probe':110 'prompt':212 'proof':106 'protocol':81 'provid':190 'quot':170 'rate':88,168 'report':150 'request':69,124 'request/response':192 'resolv':206 'respons':234 'return':119 'sampl':220 'schema':193,218 'sentiment':157 'sentiment-analysis' 'settl':70 'shape':232 'simpli':95 'span':52 'specif':108 'standard':121 'suit':6,24 'summar':160 'take':235 'text':159 'text-classification' 'text-summarization' 'token':169 'unclear':224 'unit':130 'usag':197 'usdc':9,27,72,132 'usdc-base' 'util':15,33,61 'valid':104,176 'validation' 'via':77 'wallet':211 'web3':164 'without':217 'x':99 'x-payment':98 'x402':41,79,122 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"2f896b61-5f11-4d4b-9d0f-0a24fb5a279d","listingId":"e32dca14-6656-4cc4-bd8d-163e0e7c3f0b","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/auth/token","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.931Z"}],"sources":[{"listingId":"e32dca14-6656-4cc4-bd8d-163e0e7c3f0b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/auth/token","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.931Z","lastSeenAt":"2026-04-22T04:02:49.164Z"}],"details":{"listingId":"e32dca14-6656-4cc4-bd8d-163e0e7c3f0b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/auth/token \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/auth/token"},{"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":"16 endpoints are listed across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/auth/token"}],"useCases":["Running one-off AI inference tasks (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes and gas estimates for DeFi applications","Geocoding addresses or validating data in lightweight automation pipelines","Exporting analytics metrics and reports on demand with per-call billing","Generating embeddings for search or recommendation features"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","Agents and bots that can settle payments on Base via x402","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or dedicated support","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:41.906Z"},"updatedAt":"2026-04-22T04:02:49.164Z"}}