{"id":"0b5aa773-b119-46ef-ba29-3cac05d37072","shortId":"43wASy","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a collection of x402-protocol pay-per-request APIs settled in USDC on the Base network. The specific endpoint `/api/v1/carts/94` is listed as \"Premium API Access\" and returns a standard x402 challenge requiring up to 20,000 base units of USDC (i.e., $0.02) per call. The 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).\n\nAll endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payment is handled via the x402 exact-payment scheme, settling in USDC (contract 0x8335…2913) on Base to the payee address 0x1A2B…85F3. The endpoint accepts HTTP POST and returns application/json.\n\nNote that while the landing page lists many endpoints across multiple categories, the specific endpoint being cataloged here (`/api/v1/carts/94`) is described only as \"Premium API Access\" with no further documentation about its request schema, expected input parameters, or response format. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. Without documentation or OpenAPI specs, the actual functionality behind this specific cart endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","http-post"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","USDC pay-per-call","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific endpoint /api/v1/carts/94 has no description beyond 'Premium API Access' — its actual functionality is unknown","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content","No request body schema or response examples are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/94","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/94","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, but there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no explanation of what '/api/v1/carts/94' actually does. The docs pages are empty (wallet-connect only). Effectively a stub with confirmed 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'/request':16,32 '0.02':15,31,79,128 '000':73 '0x1a2b':164 '0x8335':156 '20':72 '2913':157 '85f3':165 'Base network API' 'USDC pay-per-call' 'accept':168 'access':62,199 'across':183 'actual':239 'addit':230 'address':163 'advertis':85 'ai':9,25,97 'analysi':101 'analyt':8,24,91 'api':4,20,45,61,133,198,217 'application/json':173 'base':7,23,51,74,159 'base-network' 'behind':241 'broader':83 'call':81 'cart':244 'catalog':190 'categori':87,185 'challeng':68 'classif':104 'collect':36 'commit':141 'connect':225 'content':232 'contract':155 'convers':121 'data':90,94 'describ':194 'doc':215 'document':203,234 'embed':105 'endpoint':13,29,55,89,124,167,182,188,245 'estim':115 'exact':149 'exact-pay':148 'exchang':110 'expect':208 'export':95 'feed':109 'financ':10,26,106 'format':213 'four':86 'function':240 'gas':114 'gate':3,19 'generat':122 'geocod':119 'handl':144 'http':169 'http-post' 'i.e':78 'infrastructur':117 'input':209 'insight':96 'json-api' 'key':134 'land':178 'learn':99 'limit':137 'list':58,180 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':98 'mani':181 'metric':92 'micropayment API' 'minimum':140 'multipl':184 'network':52 'note':174 'openapi':236 'page':179,220 'paramet':210 'pay':42 'pay-per-request':41 'paye':162 'payment':142,150 'per':43,80,129 'platform':84 'post':170 'premium':60,197 'price':108,126,216 'prompt':227 'protocol':40 'quot':113 'rate':111,136 'readm':219 'render':222 'report':93 'request':44,130,206 'requir':69 'respons':212 'return':64,172 'schema':207 'scheme':151 'sentiment':100 'settl':46,152 'spec':237 'specif':54,187,243 'standard':66 'suit':5,21 'summar':103 'technic':231 'text':102 'token':112 'unclear':247 'unit':75 'usdc':48,77,154 'usdc-settlement' 'util':12,28,118 'valid':120 'via':145 'wallet':226 'web3':107 'without':233 'x402':2,18,39,67,147 'x402 API marketplace' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"edafa111-3e56-4884-8525-a029b14b427f","listingId":"0b5aa773-b119-46ef-ba29-3cac05d37072","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:14.643Z"}],"sources":[{"listingId":"0b5aa773-b119-46ef-ba29-3cac05d37072","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:14.643Z","lastSeenAt":"2026-04-23T10:30:29.715Z"}],"details":{"listingId":"0b5aa773-b119-46ef-ba29-3cac05d37072","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/94 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/94"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","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 asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/94"}],"useCases":["Paying per-request for API access without API keys or subscriptions","Programmatic agent access to analytics, AI, or finance endpoints via x402","Integrating crypto-settled microservices into automated workflows"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Users without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.506Z"},"updatedAt":"2026-04-23T10:30:29.715Z"}}