{"id":"e0e28a23-9d25-4eba-b896-ec84af136ff1","shortId":"YrKPCK","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/wire/32` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely thin — the /docs, /pricing, /api, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The x402 challenge for this endpoint is live and well-formed, confirming the endpoint accepts POST requests and pays to address 0x1A2B...85F3 using USDC on Base. However, without documentation on what the `/api/v1/wire/32` endpoint actually returns or what input it expects, callers will need to experiment or contact the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet'","No OpenAPI or schema describing request/response formats for /api/v1/wire/32","The endpoint name 'Premium API Access' is generic and does not describe actual functionality","Cannot verify what data or service this specific endpoint provides without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/32","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but there is zero documentation on what this specific endpoint does, what inputs it accepts, or what it returns. No OpenAPI spec, no examples, and all doc pages show only 'Connect wallet'. The listing is effectively a 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'/api/v1/wire/32':69,233 '/docs':167 '/pricing':168 '/readme':171 '/request':19,38,160 '0.02':18,37,87,159 '000':81 '0x1a2b':221 '20':80 '402 payment api' '6':93 '85f3':222 'accept':214 'access':75 'actual':235 'address':220 'advertis':102,116 'ai':12,31,127 'ai-inference' 'analysi':131 'analyt':121 'api':5,24,45,74,96 'attach':105 'base':8,27,63,82,226 'base network api' 'broad':50 'call':4,23 'caller':103,242 'catalog':51 'categori':119 'challeng':201 'charg':77 'classif':134 'classification' 'confirm':211 'connect':178 'contact':248 'convers':151 'cover':10,29 'data':11,30,120,124 'data-analytics' 'decim':94 'detail':185 'document':162,194,229 'embed':135 'embeddings' 'enabl':44 'endpoint':16,35,57,67,118,155,204,213,234 'estim':145 'exampl':198 'exchang':140 'expect':241 'experi':246 'export':125 'extrem':164 'feed':139 'financ':13,32,136 'finance-data' 'form':210 'four':117 'gas':144 'generat':152 'geocod':149 'geocoding' 'header':109 'howev':227 'i.e':86 'infrastructur':147 'input':239 'insight':126 'key':97 'learn':129 'limit':100 'list':71,154 'live':206 'low payment fee' 'lowpaymentfee.com':39 'machin':128 'metric':122 'micropayment api' 'minim':177 'need':244 'network':64 'offer':48 'openapi':189 'page':172 'pay':2,21,54,218 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':108 'per':3,22,55,88 'platform':6,25,46,115 'post':215 'premium':73 'price':138,161 'prompt':180 'provid':250 'quot':143 'rate':99,141 'report':123 'request':56,89,112,216 'request/response':192 'resolv':174 'return':236 'schema':193 'sentiment':130 'sentiment-analysis' 'settl':58 'share':156 'simpli':104 'sinc':90 'spec':190 'specif':66 'summar':133 'technic':184 'text':132 'text-summarization' 'thin':165 'token':142 'unit':83 'usag':197 'usdc':9,28,60,85,91,224 'usdc api' 'usdc-base' 'use':92,223 'util':15,34,148 'utility-apis' 'valid':150 'wallet':179 'web3':137 'well':209 'well-form':208 'wider':114 'without':228 'x402':43,107,200 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f9493a71-4879-4f91-ba44-9bf42aa0df99","listingId":"e0e28a23-9d25-4eba-b896-ec84af136ff1","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:05.298Z"}],"sources":[{"listingId":"e0e28a23-9d25-4eba-b896-ec84af136ff1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:05.298Z","lastSeenAt":"2026-04-22T07:01:44.705Z"}],"details":{"listingId":"e0e28a23-9d25-4eba-b896-ec84af136ff1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/32 \\\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 requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/32"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/32"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time financial data or crypto gas estimates with per-call USDC micropayments","Running geocoding or data validation tasks with no subscription commitment","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, no-API-key access to common utility endpoints","Micropayment-friendly workloads where $0.02/call is cost-effective"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or detailed documentation","Users who cannot transact in USDC on the Base network","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.31Z"},"updatedAt":"2026-04-22T07:01:44.705Z"}}