{"id":"217af37c-6eb3-429d-a119-65a60d2b7672","shortId":"7SRJQG","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys needed.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys needed.","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/54` 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/54`) is labeled \"Premium API Access\" but its specific functionality is not documented beyond that label. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Without further documentation or an OpenAPI schema, the exact request/response format for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","commerce"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint name 'Premium API Access' and path '/api/v1/carts/54' give no indication of what data or service is returned","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no usable content","Request and response formats are completely unknown — integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/54","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/54","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 OpenAPI schema, no documentation beyond a label, no request/response examples, and the docs/pricing/README pages are all empty stubs showing only 'Connect wallet'. The actual functionality of /api/v1/carts/54 is entirely 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'/call':13,30 '0.02':12,29,82,157 '000':76 '20':75 '402':70 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,96,168 'across':116 'addit':194 'advertis':87 'ai':126 'analysi':130 'analyt':120 'api':5,15,22,32,42,65,89,167 'attach':99 'base':8,25,55,77 'beyond':176 'broader':112 'call':84 'caller':97 'categori':118 'challeng':71 'classif':133 'connect':189 'content':195 'convers':150 'crypto-paid API' 'data':119,123 'doc':180 'document':175,198 'embed':134 'endpoint':59,115,153,162,209 'estim':144 'exact':204 'exchang':139 'export':124 'feed':138 'financ':135 'format':206 'four':117 'function':172 'gas':143 'generat':151 'geocod':148 'header':104 'http-post' 'i.e':81 'infrastructur':146 'insight':125 'instant':95 'json-response' 'key':16,33,90 'label':165,178 'learn':128 'limit':93 'list':62 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':127 'metric':121 'need':17,34 'network':56 'no-api-key' 'offer':114 'openapi':201 'page':184 '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 'premium':64,166 'price':137,155,181 'prompt':191 'proof':110 'protocol':48 'quot':142 'rate':92,140 'readm':183 'report':122 'request':4,21,41,72,159 'request/response':205 'return':68,186 'schema':202 'sentiment':129 'simpli':98 'specif':58,171 'summar':132 'text':131 'token':141 'unit':78 'unknown':211 'usdc':9,26,51,80 'usdc-base-network' 'use':45 'util':147 'valid':107,149 'via':10,27 'wallet':190 'web3':136 'without':196 'x':102 'x-payment':101 'x402':11,28,47,108 'x402 API' 'x402-payment'","prices":[{"id":"f78920a8-a97f-4a85-a75c-40684fb71a04","listingId":"217af37c-6eb3-429d-a119-65a60d2b7672","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:08.352Z"}],"sources":[{"listingId":"217af37c-6eb3-429d-a119-65a60d2b7672","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:08.352Z","lastSeenAt":"2026-04-22T16:30:43.164Z"}],"details":{"listingId":"217af37c-6eb3-429d-a119-65a60d2b7672","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/54 \\\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/54"},{"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/54"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic purchasing via x402 protocol without subscription commitments"],"bestFor":["Developers wanting zero-commitment, per-call API pricing","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who want frictionless API access"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk/subscription pricing","Developers who cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.824Z"},"updatedAt":"2026-04-22T16:30:43.164Z"}}