{"id":"13016677-c524-4bcd-952d-388da7b25abb","shortId":"wcHwzh","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint `/api/v1/carts/34` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, subscriptions, or rate limits required.\n\nThe broader platform advertises four categories of endpoints: 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 listed at the same $0.02/request price point.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific functionality behind `/api/v1/carts/34` (labeled \"Premium API Access\") is unclear and does not map to any of the advertised API categories, suggesting it may be a demo or placeholder endpoint.","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-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api","no-auth api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no technical content","No OpenAPI or schema documentation available for any endpoint","The endpoint path /api/v1/carts/34 does not correspond to any of the advertised API categories — its actual functionality is unknown","No request body schema or response format documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/34","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/34","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 with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/carts/34 is unclear. The listing is effectively a stub with confirmed 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'/api/v1/carts/34':64,211 '/call':19,38 '/docs':172 '/pricing':174 '/readme':176 '/request':164 '0.02':18,37,91,163 '000':80 '0x8335':85 '20':79 '2913':86 '402':74 '6':96 'access':70,215 'advertis':118,226 'ai':12,31,130 'ai-inference' 'analysi':134 'analyt':124 'api':5,24,48,69,108,214,227 'avail':203 'base':8,27,57,81,88 'base network api' 'base-network' 'behind':210 'broader':116 'call':93 'categori':120,228 'challeng':75 'cheap api' 'classif':137 'collect':42 'connect':182 'convers':154 'crawl':206 'data':11,30,123,127 'data-analytics' 'decim':97 'demo':234 'detail':189 'document':167,198 'embed':138 'embeddings' 'endpoint':16,35,49,63,122,157,237 'equal':90 'estim':148 'exact':104 'exampl':202 'exchang':143 'export':128 'extrem':169 'feed':142 'financ':13,32,139 'finance-data' 'four':119 'function':209 'gas':147 'generat':155 'geocod':152 'geocoding' 'host':40 'infrastructur':150 'insight':129 'key':109 'label':212 'learn':132 'limit':113 'list':66,159 'low payment fee' 'lowpaymentfee.com':39 'machin':131 'made':100 'map':221 'may':231 'metric':125 'micropayment api' 'network':58 'no-api-key' 'no-auth api' 'openapi':193 'page':177 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payment':98 'per':3,22,46,92 'placehold':236 'platform':117 'point':166 'premium':68,213 'price':141,165 'prompt':184 'protocol':54 'quot':146 'rate':112,144 'render':179 'report':126 'request':4,23,47,76 'request/response':196 'requir':114 'return':72 'schema':197 'scheme':105 'sentiment':133 'sentiment-analysis' 'settl':50 'spars':170 'spec':194 'specif':62,208 'subscript':110 'suggest':229 'suit':6,25 'summar':136 'technic':188 'text':135 'text-summarization' 'token':145 'unclear':217 'unit':82 'usag':201 'usdc':60,84,94 'usdc api' 'usdc-settlement' 'use':59,95 'util':15,34,151 'utility-apis' 'valid':153 'via':9,28,51,101 'wallet':183 'web3':140 'x402':10,29,53,103 'x402 api' 'x402-payment'","prices":[{"id":"0ba3bd33-d93d-429b-add0-16196bc18262","listingId":"13016677-c524-4bcd-952d-388da7b25abb","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:22.508Z"}],"sources":[{"listingId":"13016677-c524-4bcd-952d-388da7b25abb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:22.508Z","lastSeenAt":"2026-04-23T10:30:30.026Z"}],"details":{"listingId":"13016677-c524-4bcd-952d-388da7b25abb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/34 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/34"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","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"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/34"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments","Integrating pay-as-you-go data analytics into agent workflows"],"bestFor":["AI agents needing low-friction, keyless API access via crypto micropayments","Developers prototyping with multiple API categories at minimal cost","Applications that need on-demand access without subscription commitments"],"notFor":["High-volume production workloads requiring guaranteed SLAs and detailed documentation","Users without a Base-network USDC wallet or x402-compatible client","Anyone needing well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.076Z"},"updatedAt":"2026-04-23T10:30:30.026Z"}}