{"id":"0e48e92c-2a99-4f6c-b1d6-61a12cddc3f9","shortId":"YJZT44","kind":"x402","title":"Pay-per-request API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set 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, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/carts/24` is labeled \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind the `/api/v1/carts/24` path is unclear; it does not map to any of the advertised API categories listed on the homepage. Agents should treat this endpoint with caution until more documentation is available.","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":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","cheap api","no-auth api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api/v1/carts/24 path does not match any of the advertised API categories on the homepage — its actual functionality is unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no useful content","No example request or response bodies are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/24","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/carts/24","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific /api/v1/carts/24 path doesn't correspond to any advertised API category. The docs, pricing, and README pages are all blank beyond a wallet connect 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'/api/v1/carts/24':118,215 '/call':19,38 '/docs':179 '/pricing':181 '/readme':183 '0.02':18,37,95,147 '000':136 '0x8335':141 '20':135 '2913':142 '300':163 '6':151 'accept':125 'access':123 'across':54 'actual':211 'advertis':131,227 'agent':234 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':11,30,58 'api':5,24,45,107,122,228 'application/json':169 'avail':209,245 'base':8,27,103,137,144 'base network api' 'behind':213 'beyond':171 'broad':50 'categori':56,229 'caution':240 'challeng':130 'cheap api' 'classif':71 'classification' 'commit':112 'connect':189 'content':195 'convers':88 'data':57,61 'data-analytics' 'decim':152 'document':170,204,243 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,116,167,238 'equal':146 'estim':82 'exact':159 'exampl':208 'exchang':77 'export':62 'extrem':176 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':212 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':148 'homepag':233 'infrastructur':84 'insight':63 'key':108 'label':120 'land':173 'learn':66 'limit':110 'list':230 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':155 'map':222 'maxamountrequir':133 'metric':59 'micropayment api' 'network':104 'no-auth api' 'offer':48 'openapi':199 'page':174,184 'paid':98 'path':216 'pay':2,21 'pay per call api' 'pay-per-request':1,20 'payment':153 'per':3,22,96 'platform':6,25,46 'post':126 'premium':121 'price':75,93 'prompt':191 'quot':80 'rate':78,109 'render':186 'report':60 'request':4,23,97,127 'request/response':202 'requir':113 'return':168 'schema':203 'scheme':160 'second':164 'sentiment':67 'sentiment-analysis' 'set':51 'spars':177 'spec':200 'specif':115 'summar':70 'text':69 'text-summarization' 'timeout':165 'token':79 'treat':236 'unclear':218 'unit':138 'usag':207 'usdc':100,140,149 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':9,28,156 'wallet':190 'web3':74 'x402':10,29,43,129,158 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"02ab621e-a05c-4354-ac4a-04c303df9fe6","listingId":"0e48e92c-2a99-4f6c-b1d6-61a12cddc3f9","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/carts/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:35.748Z"}],"sources":[{"listingId":"0e48e92c-2a99-4f6c-b1d6-61a12cddc3f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:35.748Z","lastSeenAt":"2026-04-23T12:30:48.107Z"}],"details":{"listingId":"0e48e92c-2a99-4f6c-b1d6-61a12cddc3f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/24 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/carts/24","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints span Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment via USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units (USDC, 6 decimals = $0.02) with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/carts/24"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations such as geocoding, validation, and data conversion with micropayments","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["Agents needing low-cost, no-auth API access on Base","Developers prototyping with pay-as-you-go AI and data endpoints","Web3-native applications that prefer crypto-settled API calls"],"notFor":["High-volume production workloads requiring SLAs and documented schemas","Users who need detailed API documentation or OpenAPI specs before integration","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.349Z"},"updatedAt":"2026-04-23T12:30:48.107Z"}}