{"id":"0aeefbd3-4601-45e4-badc-1e746af8e347","shortId":"gDghYe","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/carts/44` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers 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.\n\nThis particular endpoint (`/api/v1/carts/44`) is labeled \"Premium API Access\" but its actual functionality is unclear — the description is generic and no request/response schema is documented beyond the x402 challenge's indication that it accepts HTTP POST and returns `application/json`. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional technical documentation.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api access","base network api","402 payment api"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","The actual functionality of /api/v1/carts/44 ('Premium API Access') is undocumented and unclear","No request body schema or response schema is provided beyond the x402 outputSchema stub","No OpenAPI or machine-readable API specification found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/44","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind '/api/v1/carts/44' is completely opaque. The docs pages render only 'Connect wallet' with no technical 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'/call':13,30 '0.02':12,29,82,157 '000':76 '20':75 '402':70 '402 payment api' 'accept':50,193 'access':66,96,168 'across':116 'actual':171 'addit':217 'advertis':87 'ai':126 'analysi':130 'analyt':120 'api':5,15,22,32,42,65,89,167,203 'application/json':198 'attach':99 'base':8,25,55,77 'base network api' 'beyond':185 'broader':112 'call':84 'caller':97 'categori':118 'challeng':71,188 'classif':133 'connect':212 'convers':150 'data':119,123 'descript':176 'doc':200 'document':184,219 'embed':134 'endpoint':59,115,153,162 'estim':144 'exchang':139 'export':124 'feed':138 'financ':135 'four':117 'function':172 'gas':143 'generat':151 'generic':178 'geocod':148 'header':104 'http':194 'http-post' 'i.e':81 'indic':190 'infrastructur':146 'insight':125 'instant':95 'json-response' 'key':16,33,90 'label':165 'learn':128 'limit':93 'list':62 'low payment fee' 'lowpaymentfee.com':35 'machin':127 'metric':121 'micropayment api' 'network':56 'no-api-key' 'offer':114 'page':204 'particular':161 'pay':2,19,39 'pay per call api' 'pay-per-request':1,18,38 'payment':52,103,109 'per':3,20,40,83,158 'platform':6,23,43,86,113 'post':195 'premium':64,166 'price':137,155,201 'prompt':214 'proof':110 'protocol':48 'quot':142 'rate':92,140 'render':209 'report':122 'request':4,21,41,72,159 'request/response':181 'requir':17,34 'return':68,197 'schema':182 'sentiment':129 'simpli':98 'site':207 'specif':58 'summar':132 'technic':218 'text':131 'token':141 'unclear':174 'unit':78 'usdc':9,26,51,80 'usdc api access' 'usdc-base-network' 'use':45 'util':147 'valid':107,149 'via':10,27 'wallet':213 'web3':136 'x':102 'x-payment':101 'x402':11,28,47,108,187 'x402 api' 'x402-payment'","prices":[{"id":"d904dc32-3ec8-4c8c-9177-988e7dfc85a6","listingId":"0aeefbd3-4601-45e4-badc-1e746af8e347","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:11.244Z"}],"sources":[{"listingId":"0aeefbd3-4601-45e4-badc-1e746af8e347","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:11.244Z","lastSeenAt":"2026-04-23T16:30:38.901Z"}],"details":{"listingId":"0aeefbd3-4601-45e4-badc-1e746af8e347","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/44 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/44"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/44"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless, keyless API access","Users who want to avoid subscriptions and pay only per call"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.559Z"},"updatedAt":"2026-04-23T16:30:38.901Z"}}