{"id":"638b9c13-6a88-45f3-8f39-ccd70fb49b5f","shortId":"2PrPVn","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/75` 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, rate limits, or subscriptions required.\n\nThe broader platform advertises four categories of APIs: 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. The platform accepts POST requests and returns JSON responses.\n\nNote that the specific `/api/v1/carts/75` endpoint's purpose is unclear — its description is simply \"Premium API Access\" with no further documentation. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The endpoint is confirmed live (returns a valid 402 challenge), but what data or functionality it actually provides is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","no-api-key","post-method"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","Base USDC API","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content","The specific endpoint /api/v1/carts/75 has no description beyond 'Premium API Access'; its actual functionality is unknown","No OpenAPI schema or request/response examples are provided","This endpoint path (/api/v1/carts/75) does not appear in the site's own listed API catalog, making its purpose unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/75","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/75","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, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of /api/v1/carts/75 is completely undocumented. All secondary pages returned only 'Connect wallet' with no 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'/request':17,34 '0.02':16,33,88,161 '000':82 '20':81 '402':238 '402 payment API' '6':92 'Base USDC API' 'accept':168 'access':45,73,191 'actual':246 'advertis':116 'ai':10,27,128 'analysi':132 'analyt':122 'api':4,21,41,72,106,120,190,198 'avail':226 'base':7,24,61,83 'behind':51 'broader':114 'call':95 'categori':118 'challeng':239 'classif':135 'confirm':233 'connect':207 'content':213 'convers':152 'crawl':229 'data':9,26,121,125,242 'decim':93 'descript':186 'detail':224 'doc':197 'document':195,225 'embed':136 'endpoint':14,31,50,65,155,180,231 'estim':146 'exact':102 'exampl':221 'exchang':141 'export':126 'feed':140 'financ':11,28,137 'four':117 'function':244 'gas':145 'gate':3,20,44 'generat':153 'geocod':150 'given':89 'i.e':87 'infrastructur':148 'insight':127 'json':173 'json-response' 'key':107 'learn':130 'limit':109 'list':69,157 'live':234 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':129 'made':98 'marketplac':42 'metric':123 'micropay':55 'network':62 'no-api-key' 'note':175 'offer':8,25 'openapi':217 'page':202 'pay-per-request API' 'payment':77,96 'per':53,94,162 'per-request':52 'per-request-micropayment' 'platform':5,22,115,167 'point':165 'post':169 'post-method' 'premium':71,189 'price':139,164,199 'prompt':209 'protocol':40 'provid':247 'purpos':182 'quot':144 'rate':108,142 'readm':201 'report':124 'request':54,163,170 'request/response':220 'requir':75,112 'respons':174 'return':172,204,235 'schema':218 'scheme':103 'sentiment':131 'settl':56 'simpli':188 'specif':64,178 'subscript':111 'substant':212 'summar':134 'text':133 'token':143 'unclear':184 'unit':84 'unknown':249 'usdc':58,86,90 'usdc-base' 'util':13,30,149 'valid':151,237 'varieti':48 'via':99 'wallet':208 'web3':138 'x402':2,19,39,101 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"5f248b7b-77aa-4db6-9d9e-2f1f4747d367","listingId":"638b9c13-6a88-45f3-8f39-ccd70fb49b5f","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:09.801Z"}],"sources":[{"listingId":"638b9c13-6a88-45f3-8f39-ccd70fb49b5f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:09.801Z","lastSeenAt":"2026-04-23T10:30:29.479Z"}],"details":{"listingId":"638b9c13-6a88-45f3-8f39-ccd70fb49b5f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/75 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/75"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/75"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-use API endpoints without subscriptions or API keys","Making micropayment-gated API calls settled on Base L2 in USDC","Agent-driven programmatic access to gated resources via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring guaranteed SLAs or enterprise support","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.795Z"},"updatedAt":"2026-04-23T10:30:29.479Z"}}