{"id":"9fb2e6fb-31fc-4226-b859-55b51b9beca5","shortId":"SkG79b","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 infrastructure utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/messages/101` 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 given USDC's 6 decimals. The payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). All share the same $0.02 per-request pricing. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail. No OpenAPI spec, request/response schemas, or usage examples were found.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","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","ai inference api","data analytics api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no content","The specific purpose of /api/v1/messages/101 is not documented; 'Premium API Access' is generic","Example request JSON is inferred/guessed — no actual schema was provided by the endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/101","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/101","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 documented request/response schemas, no usage examples, and the /api, /pricing, and /README pages are all blank wallet-connect prompts. The purpose of the specific /messages/101 endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/api/v1/messages/101':96 '/pricing':206 '/readme':208 '/request':18,36 '0.02':17,35,68,127,192 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':142 '0x8335':121 '20':115 '2913':122 '300':145 '6':131 'accept':104 'access':102 'addit':220 'address':141 'advertis':110,151 'ai':11,29,163 'ai inference api' 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':167 'analyt':12,30,54,157 'api':5,23,43,83,101 'base':8,26,76,117,124 'base network api' 'beyond':198 'broad':48 'broader':149 'call':4,22 'categori':155 'chain':139 'challeng':109 'classif':170 'collect':49 'commit':91 'connect':216 'convers':186 'conversion' 'cost':113 'cover':10,28 'crypto-quotes' 'data':53,58,156,160 'data analytics api' 'data-analytics' 'decim':132 'detail':222 'document':197 'embed':171 'enabl':42 'endpoint':51,64,94,152 'equal':126 'estim':181 'everi':63 'exampl':230 'exchang':176 'export':161 'feed':175 'financ':13,31,172 'finance-data' 'finance/web3':57 'found':232 'four':154 'gas':180 'gas-estimates' 'general':60 'generat':187 'geocod':184 'geocoding' 'given':128 'infer':56 'infrastructur':61,183 'insight':162 'key':84 'land':200 'learn':165 'limit':87 'list':98 'low payment fee' 'lowpaymentfee.com':37 'machin':164 'maximum':112 'metric':158 'micropayment api' 'network':77 'offer':46 'on-chain':137 'openapi':224 'page':201,209 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payabl':71 'payment':134 'per':3,21,69,194 'per-request':193 'platform':44,150 'post':105 'premium':100 'price':66,174,196 'prompt':217 'protocol':81 'quot':179 'rate':86,177 'report':159 'request':70,106,195 'request/response':226 'resolv':211 'schema':227 'second':146 'sentiment':166 'settl':136 'share':189 'span':52 'spars':203 'spec':225 'specif':93 'suit':6,24 'summar':169 'technic':221 'text':168 'timeout':147 'token':178 'unit':118 'upfront':90 'usag':229 'usdc':9,27,73,120,129 'usdc api' 'usdc-base' 'util':15,33,62 'valid':185 'validation' 'via':78 'wallet':215 'wallet-connect':214 'web3':173 'x402':41,80,108 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"d2a4c824-bdf8-46b4-b8f3-a967492ed8cb","listingId":"9fb2e6fb-31fc-4226-b859-55b51b9beca5","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/101","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.716Z"}],"sources":[{"listingId":"9fb2e6fb-31fc-4226-b859-55b51b9beca5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/101","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.716Z","lastSeenAt":"2026-04-22T07:02:09.330Z"}],"details":{"listingId":"9fb2e6fb-31fc-4226-b859-55b51b9beca5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/101 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"message\": \"hello\"}'","exampleRequest":{"message":"hello"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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 x402 challenge for /api/v1/messages/101 advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/messages/101"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/101"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven AI inference (sentiment, summarization, classification, embeddings) with per-call crypto payment","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates without API key management","On-demand geocoding, data validation, or format conversion from automated pipelines","Exporting analytics metrics and reports via pay-as-you-go requests"],"bestFor":["AI agents that need low-friction, keyless API access paid in USDC on Base","Developers prototyping with multiple utility endpoints at a flat $0.02/call","Web3-native applications that prefer on-chain settlement over subscription billing"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.132Z"},"updatedAt":"2026-04-22T07:02:09.330Z"}}