{"id":"8084ce4c-cf21-49eb-b6ad-74a31559c0ae","shortId":"mGWkaP","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 exposes a broad catalog of endpoints across 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). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/keys/57` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional content. Without detailed docs it is unclear what request body this particular endpoint expects or what its response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["No API documentation, request schemas, or response schemas are available for any endpoint","The purpose of /api/v1/keys/57 specifically (vs. the other listed endpoints) is unclear — 'Premium API Access' is not explained","All secondary pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No rate limit, SLA, or uptime information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/57","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/keys/57","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 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no request/response documentation, no usage examples, and the specific purpose of /api/v1/keys/57 ('Premium API Access') is unexplained. The listing is effectively a stub with pricing info 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'/api/v1/keys/57':112 '/pricing':191 '/readme':193 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '402':122 '402 payment api' '6':137 'accept':162 'access':118 'across':54 'addit':204 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,150 'application/json':167 'avail':175 'base':8,27,103,129,136 'base usdc api' 'bodi':214 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':123 'classif':71 'classification' 'commit':158 'connect':199 'content':205 'convers':88 'conversion' 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':138 'descript':185 'detail':207 'doc':208 'document':168 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,161,176,217 'estim':82 'exact':146 'exampl':188 'exchang':77 'expect':218 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'http':163 'infrastructur':84 'insight':63 'key':151 'land':172 'learn':66 'like':225 'limit':154 'list':114,174 'look':224 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':142 'metric':59 'micropayment api' 'minim':170 'network':104 'offer':10,29 'page':173,194 'paramet':184 'particular':216 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payload':223 'payment':140 'per':3,22,96 'platform':6,25,46 'post':164 'premium':116 'price':75,93,178 'prompt':201 'protocol':108 'provid':180 'quot':80 'rate':78,153 'report':60 'request':97,124,213 'request/response':182 'requir':159 'resolv':196 'respons':222 'return':120,166 'schema':183 'scheme':147 'sentiment':67 'sentiment-analysis' 'settl':98 'specif':110 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':211 'unit':130 'upfront':157 'usag':187 'usdc':9,28,100,132 'usdc-base' 'util':15,34,85 'valid':87 'validation' 'via':105,143 'wallet':200 'web3':74 'without':206 'x402':43,107,145 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"720faa0b-c693-40f4-bdbc-1df9c40c4284","listingId":"8084ce4c-cf21-49eb-b6ad-74a31559c0ae","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/keys/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.692Z"}],"sources":[{"listingId":"8084ce4c-cf21-49eb-b6ad-74a31559c0ae","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.692Z","lastSeenAt":"2026-04-22T01:02:19.068Z"}],"details":{"listingId":"8084ce4c-cf21-49eb-b6ad-74a31559c0ae","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/57 \\\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/keys/57"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/57"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates for DeFi workflows","Geocoding addresses or validating data in automated pipelines with per-call billing","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["AI agents that need frictionless, keyless API access with crypto micropayments","Developers prototyping integrations who want zero-commitment, per-request pricing","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime commitments","Teams that require non-crypto payment methods (no fiat option documented)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.362Z"},"updatedAt":"2026-04-22T01:02:19.068Z"}}