{"id":"f5f34e38-0d7d-4701-9757-e0268913eea4","shortId":"CUNewY","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/carts/41` is listed as \"Premium API Access\" and requires a maximum payment of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform organizes its endpoints into 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 listed at the same $0.02/request price point. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the USDC contract on Base (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 example payloads available. The actual behavior and response format of the `/api/v1/carts/41` endpoint (or any other endpoint) cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","Base USDC API","micropayment gated API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/carts/41 is undocumented","The broader platform lists many endpoint categories but none have verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/41","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but documentation is effectively absent — all doc pages show only 'Connect wallet'. No OpenAPI spec, no request/response schemas, and no examples are available. The purpose of the specific /api/v1/carts/41 endpoint is unclear beyond its title 'Premium API 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'/api/v1/carts/41':67,238 '/docs':198 '/pricing':199 '/readme':202 '/request':17,34,166 '0.02':16,33,86,165 '000':81 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':185 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':192 '20':80 '6':91 'Base USDC API' 'accept':177 'access':45,73 'actual':231 'address':184 'advertis':102 'ai':10,27,133 'ai-inference' 'analysi':137 'analyt':127 'api':4,21,41,72,96 'attach':105 'avail':229,249 'base':7,24,61,82,191 'behavior':232 'behind':51 'broader':118 'call':94 'caller':103 'cannot':244 'categori':125 'challeng':171 'classif':140 'classification' 'confirm':172 'connect':208 'contract':189 'convers':156 'data':9,26,126,130 'data-analytics' 'decim':92 'detail':215 'determin':246 'document':193,224 'embed':141 'embeddings' 'endpoint':14,31,50,65,122,159,174,239,243 'estim':151 'exampl':227 'exchang':146 'export':131 'extrem':195 'feed':145 'financ':11,28,142 'finance-data' 'format':235 'four':124 'gas':150 'gate':3,20,44 'generat':157 'geocod':154 'geocoding' 'header':110 'infrastructure/utilities':153 'insight':132 'key':97 'learn':135 'limit':100 'list':69,161 'live':176 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':134 'marketplac':42 'materi':250 'maximum':77 'metric':128 'micropay':55 'micropayment gated API' 'network':62 'offer':8,25 'openapi':219 'organ':120 'page':203 'pay-per-request API' 'payload':228 'payment':78,109,115,182 'per':53,93 'per-request':52 'per-request-micropayment' 'platform':5,22,119 'point':168 'post':178 'premium':71 'price':144,167 'prompt':210 'proof':116 'protocol':40 'quot':149 'rate':99,147 'render':205 'report':129 'request':54,179 'request/response':222 'requir':75 'respons':234 'schema':223 'sentiment':136 'sentiment-analysis' 'settl':56,181 'simpli':104 'sinc':88 'spars':196 'spec':220 'specif':64 'summar':139 'technic':214 'text':138 'text-summarization' 'token':148 'unit':83 'usd':87 'usdc':58,85,89,188 'usdc-base' 'use':90,186 'util':13,30 'utility-apis' 'valid':113,155 'varieti':48 'wallet':209 'web3':143 'x':108 'x-payment':107 'x402':2,19,39,114,170 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"5d1e9f6d-1c82-48f7-bf94-759eae9ee0b0","listingId":"f5f34e38-0d7d-4701-9757-e0268913eea4","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:52.395Z"}],"sources":[{"listingId":"f5f34e38-0d7d-4701-9757-e0268913eea4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:52.395Z","lastSeenAt":"2026-04-23T12:05:08.755Z"}],"details":{"listingId":"f5f34e38-0d7d-4701-9757-e0268913eea4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/41 \\\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":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/carts/41 requires maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/41"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/41"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) via micropayments","Running utility operations (geocoding, validation, conversion) on a pay-per-use basis","Integrating agent-driven workflows that settle per-call costs in USDC on Base"],"bestFor":["Agents or applications that need keyless, pay-per-call API access","Developers wanting to avoid subscription commitments for low-volume API usage","Crypto-native workflows already operating on the Base network"],"notFor":["High-volume production workloads where per-request pricing may add up versus flat-rate plans","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.677Z"},"updatedAt":"2026-04-23T12:05:08.755Z"}}