{"id":"48b2e0af-1517-47f0-89e3-0aedc4663494","shortId":"ck4XWK","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 USDC micropayments on the Base network. The specific endpoint `/api/v1/carts/37` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call via the x402 exact payment scheme. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid payment proof.\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 per request price point and settle payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what request body the POST expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-call API","USDC API access","Base network API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only a 'Connect wallet' prompt","No OpenAPI or schema definition for any endpoint","The specific function of /api/v1/carts/37 ('Premium API Access') is not explained anywhere","No request body schema or response format documented — callers must experiment","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/carts/37 is unclear beyond the generic 'Premium API Access' label. Pricing is clear but everything else must be 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'/api/v1/carts/37':63 '/docs':184 '/pricing':185 '/readme':188 '/request':17,34 '0.02':16,33,83,162 '000':78 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':172 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':176 '20':77 '402':221 'Base network API' 'USDC API access' 'access':44,69 'address':171 'advertis':117 'ai':10,27,129 'analysi':133 'analyt':123 'api':4,21,40,68,94 'attach':103 'avail':214 'base':7,24,58,79,178 'base-network' 'behind':50 'bodi':235 'broader':115 'call':86 'caller':101 'categori':119 'challeng':226 'classif':136 'confirm':218 'connect':194 'content':200 'contract':175 'convers':153 'data':9,26,122,126 'document':179,209,229 'embed':137 'endpoint':14,31,49,62,121,156,216 'estim':147 'exact':90 'exampl':212 'exchang':142 'expect':238 'export':127 'extrem':181 'feed':141 'financ':11,28,138 'four':118 'gas':146 'gate':3,20,43 'generat':154 'geocod':151 'header':108 'infrastructur':149 'insight':128 'json-response' 'key':95 'learn':131 'limit':98 'list':65,158 'live':219 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':130 'marketplac':41 'metric':124 'micropay':55 'micropayment API' 'network':59 'no-api-key' 'offer':8,25 'openapi':204 'page':189 'pay-per-call API' 'payload':213,242 'payment':73,91,107,112,169 'per':52,85,163 'per-request':51 'per-request-billing' 'platform':5,22,116 'point':166 'post':237 'post-endpoint' 'premium':67 'price':140,165 'prompt':196 'proof':113 'protocol':39 'quot':145 'rate':97,143 'render':191 'report':125 'request':53,164,234 'request/response':207 'requir':71,100 'respons':241 'return':220,244 'schema':208 'scheme':92 'sentiment':132 'settl':168 'simpli':102 'spars':182 'spec':205 'specif':61 'summar':135 'text':134 'token':144 'unclear':232 'unit':80 'usd':84 'usdc':54,82,174 'usdc-micropayment' 'use':173 'util':13,30,150 'valid':111,152,224 'varieti':47 'via':87 'wallet':195 'web3':139 'without':228 'x':106 'x-payment':105 'x402':2,19,38,89,225 'x402 API marketplace' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"fe0f0f6c-35d5-4dcf-84cd-30964273231e","listingId":"48b2e0af-1517-47f0-89e3-0aedc4663494","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:09.531Z"}],"sources":[{"listingId":"48b2e0af-1517-47f0-89e3-0aedc4663494","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:09.531Z","lastSeenAt":"2026-04-23T13:30:31.947Z"}],"details":{"listingId":"48b2e0af-1517-47f0-89e3-0aedc4663494","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/37 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/37"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/37"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to data, AI, finance, or utility APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled via crypto micropayments","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns on Base","AI agents that can autonomously pay for API access with USDC","Users who want no-commitment, no-signup API access"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Users without access to USDC on the Base network","High-volume use cases where $0.02/request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.696Z"},"updatedAt":"2026-04-23T13:30:31.947Z"}}