{"id":"e0c276dd-6a79-4c53-8dfa-f7dc793fed35","shortId":"H7aCku","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/32` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.\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/request price point. The platform accepts POST requests and returns JSON responses.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The `/api/v1/carts/32` endpoint itself is confirmed live via a valid 402 challenge, but the actual behavior and response format of this specific cart endpoint (as opposed to the other listed API categories) is unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI spec or schema documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content","The specific purpose and expected input/output of /api/v1/carts/32 is undocumented — it does not clearly map to any of the advertised API categories","No request or response examples could be obtained"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/32","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific purpose of the `/api/v1/carts/32` endpoint is unclear beyond the generic 'Premium API Access' label. This is effectively a stub 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'/request':17,34,164 '0.02':16,33,88,163 '000':82 '20':81 '402':227 '6':92 'Base network API' 'USDC API' 'accept':169 'access':45,73 'actual':231 'addit':196 'advertis':118 'ai':10,27,130 'analysi':134 'analyt':124 'api':4,21,41,72,106,182,247 'avail':212 'base':7,24,61,83 'base-network' 'behavior':232 'behind':51 'broader':116 'call':95 'cart':239 'categori':120,248 'challeng':228 'classif':137 'confirm':222 'connect':191 'content':216 'convers':154 'crawl':215 'data':9,26,123,127 'decim':93 'detail':198 'doc':181 'document':176,207 'embed':138 'endpoint':14,31,50,65,122,157,219,240 'estim':148 'exact':102 'exampl':211 'exchang':143 'export':128 'extrem':178 'feed':142 'financ':11,28,139 'format':235 'four':119 'gas':147 'gate':3,20,44 'generat':155 'geocod':152 'given':89 'i.e':87 'infrastructur':150 'insight':129 'json':174 'json-response' 'key':107 'learn':132 'limit':110 'list':69,159,246 'live':223 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':131 'made':98 'marketplac':42 'metric':125 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':202 'oppos':242 'page':186 'pay-per-request API' 'payment':77,96 'per':53,94 'per-request':52 'per-request-billing' 'platform':5,22,117,168 'point':166 'post':170 'post-method' 'premium':71 'price':141,165,183 'prompt':193 'protocol':40 'quot':146 'rate':109,144 'readm':185 'render':188 'report':126 'request':54,171 'request/response':205 'requir':75,114 'respons':175,234 'return':173 'schema':206 'scheme':103 'sentiment':133 'settl':56 'spars':179 'spec':203 'specif':64,238 'subscript':113 'summar':136 'technic':197 'text':135 'token':145 'unclear':250 'unit':84 'usag':210 'usdc':58,86,90 'usdc-micropayment' 'util':13,30,151 'valid':153,226 'varieti':48 'via':99,224 'wallet':192 'web3':140 'x402':2,19,39,101 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"1a99d20c-5792-4ac6-9f89-6540ce8c9f17","listingId":"e0c276dd-6a79-4c53-8dfa-f7dc793fed35","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:03.485Z"}],"sources":[{"listingId":"e0c276dd-6a79-4c53-8dfa-f7dc793fed35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:03.485Z","lastSeenAt":"2026-04-23T13:30:31.683Z"}],"details":{"listingId":"e0c276dd-6a79-4c53-8dfa-f7dc793fed35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/32 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/32"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/32"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for data analytics or AI inference without managing API keys or subscriptions","Integrating agent-purchasable endpoints into autonomous workflows using x402 micropayments","Accessing utility services like geocoding or data conversion with instant crypto-settled billing"],"bestFor":["Developers or agents wanting zero-friction, keyless API access via crypto micropayments","x402-compatible agent wallets that can settle USDC on Base","Low-volume or bursty workloads where pay-per-request is more economical than subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLAs, rate-limit guarantees, or support contracts","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.986Z"},"updatedAt":"2026-04-23T13:30:31.683Z"}}