{"id":"f06fe91f-b6bf-4093-95e9-58fe7cce40dc","shortId":"52F2R3","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that exposes a broad set of endpoints across four categories: Data & Analytics (metrics, reports, 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 endpoints are pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 payment protocol.\n\nThe specific endpoint at `/api/v1/wire/190` is listed as \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the `exact` scheme to the specified wallet address, with a 300-second timeout. No API keys or rate limits are advertised; access is granted immediately upon payment.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/wire/190` endpoint actually returns. The landing page lists many endpoints but provides no documentation on input parameters or output formats for any of them.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","premium api access"],"warnings":["No documentation available — docs, pricing, API, and README pages all resolve to a minimal 'Connect wallet' prompt","No OpenAPI or schema describing request parameters or response format for /api/v1/wire/190","The endpoint name 'Premium API Access' is generic and does not describe what the endpoint actually returns","No information on what distinguishes /api/v1/wire/190 from the other listed endpoints","No rate limit, SLA, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/190","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/wire/190","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, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what /api/v1/wire/190 actually does beyond the generic label 'Premium API Access'. The listing is effectively a 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'/request':17,34 '0.02':16,33,93,133 '000':128 '20':127 '300':156 '6':138 'access':117,167 'across':50 'actual':213 'address':153 'advertis':166 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':54 'api':4,21,41,116,160,180 'base':7,24,100,129,141 'base network api' 'broad':46 'call':91 'categori':52 'challeng':123 'classif':66 'classification' 'connect':189 'convers':83 'conversion' 'crypto-quotes' 'data':9,26,53 'data-analytics' 'decim':139 'descript':207 'detail':196 'doc':178 'document':173,224 'embed':67 'embeddings' 'endpoint':14,31,49,86,109,212,220 'estim':77 'exact':147 'exampl':204 'exchang':72 'export':57 'expos':44 'extrem':175 'feed':71 'financ':11,28,68 'finance-data' 'format':230 'four':51 'gas':76 'gas-estimates' 'gate':3,20 'generat':84 'geocod':81 'geocoding' 'grant':169 'immedi':170 'infrastructur':79 'input':226 'insight':58 'key':161 'land':216 'learn':61 'limit':164 'list':113,218 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':144 'mani':219 'marketplac':42 'metric':55 'micropayment api' 'minim':188 'network':101 'offer':8,25 'openapi':200 'output':229 'page':183,217 'paramet':227 'pay':89 'pay per call api' 'pay-per-cal':88 'pay-per-request' 'payment':105,142,172 'per':90 'platform':5,22 'premium':115 'premium api access' 'price':70,179 'prompt':191 'protocol':40,106 'provid':222 'quot':75 'rate':73,163 'readm':182 'report':56 'request':124 'request/response':203 'resolv':185 'return':119,214 'schema':201 'scheme':148 'second':157 'sentiment':62 'sentiment-analysis' 'set':47 'settl':95 'sinc':135 'spars':176 'specif':108 'specifi':151 'summar':65 'technic':195 'text':64 'text-summarization' 'timeout':158 'token':74 'unit':130 'upon':171 'usd':134 'usdc':97,132,136 'usdc api access' 'usdc-base' 'use':137 'util':13,30,80 'valid':82,121 'validation' 'via':102,145 'wallet':152,190 'web3':69 'x402':2,19,39,104,122 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"9efc78b0-ee25-4be8-8a94-196a8ec260f2","listingId":"f06fe91f-b6bf-4093-95e9-58fe7cce40dc","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/wire/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:54.952Z"}],"sources":[{"listingId":"f06fe91f-b6bf-4093-95e9-58fe7cce40dc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/190","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:54.952Z","lastSeenAt":"2026-04-22T13:32:00.005Z"}],"details":{"listingId":"f06fe91f-b6bf-4093-95e9-58fe7cce40dc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/190 \\\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":"All endpoints are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network via x402 protocol","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/190"},{"claim":"No API keys or rate limits are advertised","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-request basis","Geocoding, data validation, or format conversion via lightweight utility endpoints","Exporting data or generating analytics reports with no subscription commitment"],"bestFor":["Agents or bots that need on-demand API access without pre-registration","Low-volume or bursty workloads where per-request pricing is cost-effective","Developers experimenting with x402 payment protocol integrations"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications requiring authenticated sessions or stateful interactions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.865Z"},"updatedAt":"2026-04-22T13:32:00.005Z"}}