{"id":"3c60119e-98ec-44b9-b901-aa0d767a0a45","shortId":"V25DDV","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 provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/38` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call via the x402 exact payment scheme. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe 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. However, the probed endpoint `/api/v1/keys/38` does not clearly map to any of these named endpoints, so its exact functionality is uncertain — it may be a generic key-provisioning or access-granting endpoint.\n\nThe x402 challenge confirms the endpoint is live, accepts POST requests, settles on Base mainnet using USDC (contract 0x8335…2913), and pays to address 0x1A2B…85F3 with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","data analytics api","ai inference api"],"warnings":["The endpoint /api/v1/keys/38 does not correspond to any named endpoint on the landing page; its exact functionality is unknown.","No OpenAPI spec, detailed docs, or example responses were found — /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt.","No input or output schema is documented; callers must guess at the request body format."],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/38","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and settlement details, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific endpoint /api/v1/keys/38 has unclear functionality. Most detail is inferred from the homepage 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'/request':19,38,165 '0.02':18,37,86,164 '000':80 '0x1a2b':225 '0x8335':219 '20':79 '2913':220 '300':229 '85f3':226 'accept':209 'access':74,198 'access-gr':197 'address':224 'advertis':121 'ai':12,31,132 'ai inference api' 'ai-inference' 'analysi':136 'analyt':126 'api':5,24,45,73,96 'attach':107 'base':8,27,63,81,214 'base network api' 'base-network' 'broad':50 'call':4,23,88 'caller':105 'catalog':51 'categori':124 'challeng':203 'charg':76 'classif':139 'clear':174 'commit':102 'confirm':204 'contract':218 'convers':156 'crawl':244 'data':11,30,125,129 'data analytics api' 'data-analytics' 'detail':235 'document':236 'embed':140 'embeddings' 'enabl':44 'endpoint':16,35,57,67,123,160,170,181,200,206 'estim':150 'exact':92,184 'exampl':238 'exchang':145 'export':130 'feed':144 'financ':13,32,141 'finance-data' 'found':241 'four':122 'function':185 'gas':149 'generat':157 'generic':192 'geocod':154 'geocoding' 'grant':199 'header':112 'howev':167 'i.e':85 'infrastructur':152 'insight':131 'key':97,194 'key-provis':193 'label':71 'learn':134 'limit':99 'list':159 'live':208 'low payment fee' 'lowpaymentfee.com':39 'machin':133 'mainnet':215 'map':175 'may':189 'metric':127 'micropayment api' 'name':180 'network':64 'no-api-key' 'offer':10,29 'openapi':233 'pay':2,21,54,222 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':93,111,117 'per':3,22,55,87 'platform':6,25,46,120 'post':210 'premium':72 'price':143,166 'probe':169 'proof':118 'provid':48 'provis':195 'quot':148 'rate':98,146 'report':128 'request':56,211 'requir':104 'respons':239 'schema':234 'scheme':94 'second':230 'sentiment':135 'sentiment-analysis' 'settl':58,212 'share':161 'simpli':106 'specif':66 'summar':138 'text':137 'text-summarization' 'timeout':231 'token':147 'uncertain':187 'unit':82 'upfront':101 'usdc':9,28,60,84,217 'usdc api' 'usdc-settlement' 'use':216 'util':15,34,153 'utility-apis' 'valid':115,155 'via':89 'web3':142 'x':110 'x-payment':109 'x402':43,91,116,202 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7411f38b-8022-413d-bd87-6b363e4d5294","listingId":"3c60119e-98ec-44b9-b901-aa0d767a0a45","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.150Z"}],"sources":[{"listingId":"3c60119e-98ec-44b9-b901-aa0d767a0a45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.150Z","lastSeenAt":"2026-04-22T09:02:14.516Z"}],"details":{"listingId":"3c60119e-98ec-44b9-b901-aa0d767a0a45","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/38 \\\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":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/38"},{"claim":"Payment settles to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/38"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time crypto prices, gas estimates, and exchange rates via pay-per-use endpoints","Geocoding and data validation as utility microservices"],"bestFor":["AI agents that need low-friction, keyless API access with crypto micropayments","Developers prototyping with multiple API categories without subscription overhead","Web3-native applications that prefer on-chain settlement for API calls"],"notFor":["High-volume production workloads where per-request pricing becomes expensive compared to bulk plans","Users without USDC on Base network or unfamiliar with x402 payment protocol"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.262Z"},"updatedAt":"2026-04-22T09:02:14.516Z"}}