{"id":"3abbad36-349e-49b2-a4ca-ee63ea33df9a","shortId":"heUDez","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/18` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (i.e., $0.02) per call, settled on-chain to a designated wallet address. 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 hosts 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 listed at the same $0.02/request price point.\n\nNote that the specific `/api/v1/carts/18` endpoint's purpose is not clearly documented beyond the generic label \"Premium API Access.\" The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, OpenAPI schema, or usage examples. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation about what this particular cart endpoint returns makes it difficult to assess its actual utility.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","402 payment api","crypto api gateway"],"warnings":["No documentation available — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no technical content.","The specific purpose and response format of /api/v1/carts/18 ('Premium API Access') is undocumented; it is unclear what data or service it provides.","No OpenAPI or output schema beyond basic HTTP method metadata.","The endpoint label 'Premium API Access' is generic and does not describe functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/18","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/18","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 there is essentially no documentation about what /api/v1/carts/18 actually returns. No OpenAPI schema, no example responses, and all doc pages render only a wallet-connect prompt. The purpose of this specific endpoint is unclear beyond its generic 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'/request':17,34,171 '0.02':16,33,84,170 '000':78 '20':77 '402':224 '402 payment api' 'access':44,69,107,192 'across':127 'actual':245 'addit':208 'address':95 'advertis':98 'ai':10,27,137 'analysi':141 'analyt':131 'api':4,21,40,68,100,191,197 'assess':243 'attach':110 'base':7,24,58,79 'base usdc api' 'base-network' 'behind':50 'beyond':186 'broader':123 'call':86 'caller':108 'cart':236 'categori':129 'chain':90 'challeng':226 'classif':144 'clear':184 'confirm':219 'connect':203 'convers':161 'crypto api gateway' 'data':9,26,130,134 'design':93 'difficult':241 'doc':194 'document':185,210,231 'embed':145 'endpoint':14,31,49,62,126,164,179,217,237 'estim':155 'exampl':215 'exchang':150 'export':135 'feed':149 'financ':11,28,146 'four':128 'gas':154 'gate':3,20,43 'generat':162 'generic':188 'geocod':159 'header':115 'host':125 'i.e':83 'infrastructur':157 'insight':136 'instant':106 'json-response' 'key':101 'label':189 'lack':229 'learn':139 'limit':104 'list':65,166 'live':220 'low payment fee' 'lowpaymentfee.com':35 'machin':138 'make':239 'marketplac':41 'metric':132 'micropay':55 'micropayment api' 'network':59 'no-api-key' 'note':174 'offer':8,25 'on-chain':88 'openapi':211 'page':198 'particular':235 'pay-per-request api' 'payment':73,114,120 'per':52,85 'per-request':51 'per-request-billing' 'platform':5,22,97,124 'point':173 'post-method' 'premium':67,190 'price':148,172,195 'prompt':205 'proof':121 'proper':223 'protocol':39 'purpos':181 'quot':153 'rate':103,151 'report':133 'request':53 'requir':71 'return':200,221,238 'schema':212 'sentiment':140 'settl':87 'simpli':109 'specif':61,177 'summar':143 'technic':209 'text':142 'token':152 'unit':80 'usag':214 'usdc':54,82 'usdc-micropayment' 'util':13,30,158,246 'valid':118,160 'varieti':47 'wallet':94,204 'web3':147 'x':113 'x-payment':112 'x402':2,19,38,119,225 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"67dd26f0-e594-4234-b328-6324c57ab3f6","listingId":"3abbad36-349e-49b2-a4ca-ee63ea33df9a","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:20.934Z"}],"sources":[{"listingId":"3abbad36-349e-49b2-a4ca-ee63ea33df9a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:20.934Z","lastSeenAt":"2026-04-23T13:30:32.477Z"}],"details":{"listingId":"3abbad36-349e-49b2-a4ca-ee63ea33df9a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/18 \\\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/18"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/18"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","Crypto-native applications that can settle USDC on Base","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.18Z"},"updatedAt":"2026-04-23T13:30:32.477Z"}}