{"id":"c508d3c0-3a7a-4bf3-8c7b-afdcfc274ecf","shortId":"ksgD5E","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 platform that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/carts/57` 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 advertised — callers simply attach an X-PAYMENT header with a valid payment proof to access the resource.\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. Payments settle in USDC on the Base L2 network to a single payTo address.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 usage examples available from the crawl. The specific functionality behind `/api/v1/carts/57` (labeled \"Premium API Access\") is unclear and does not map obviously to any of the listed API categories. Callers should expect to experiment or contact the provider for details on what this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","low payment fee API","402 payment required API"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only 'Connect wallet' with no content.","The specific endpoint /api/v1/carts/57 is labeled 'Premium API Access' but its actual functionality is undocumented and unclear.","No request body schema or response schema is provided; callers must experiment to discover expected inputs and outputs.","The platform lists many endpoint categories (AI, finance, data, utils) but none are documented beyond titles and prices."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/57","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/carts/57 is unexplained. Effectively a stub 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'/api/v1/carts/57':65,230 '/docs':191 '/pricing':193 '/readme':195 '/request':17,34,169 '0.02':16,33,85,168 '000':80 '20':79 '402 payment required API' 'Base USDC API' 'access':45,71,117,234 'address':185 'advertis':102,123 'ai':10,27,135 'analysi':139 'analyt':129 'api':4,21,41,70,96,233,247 'attach':105 'avail':222 'base':7,24,59,81,178 'base-network' 'behind':51,229 'broader':121 'call':88 'caller':103,249 'categori':125,248 'classif':142 'connect':201 'contact':255 'convers':159 'crawl':225 'data':9,26,128,132 'detail':208,259 'document':186,217 'embed':143 'endpoint':14,31,50,63,127,162,264 'estim':153 'exact':92 'exampl':221 'exchang':148 'expect':251 'experi':253 'export':133 'extrem':188 'feed':147 'financ':11,28,144 'four':124 'function':228 'gas':152 'gate':3,20,44 'generat':160 'geocod':157 'header':110 'infrastructur':155 'insight':134 'json-response' 'key':97 'l2':179 'label':231 'learn':137 'limit':100 'list':67,164,246 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':136 'map':240 'metric':130 'micropay':56 'micropayment API' 'network':60,180 'no-api-key' 'obvious':241 'offer':8,25 'openapi':212 'page':196 'particular':263 'pay-per-request API' 'payment':75,93,109,114,172 'payto':184 'per':53,87 'per-request':52 'per-request-billing' 'platform':5,22,42,122 'point':171 'premium':69,232 'price':146,170 'prompt':203 'proof':115 'protocol':40 'provid':257 'quot':151 'rate':99,149 'render':198 'report':131 'request':54 'request/response':215 'requir':73 'resourc':119 'return':265 'schema':216 'scheme':94 'sentiment':138 'settl':173 'simpli':104 'singl':183 'spars':189 'spec':213 'specif':62,227 'summar':141 'technic':207 'text':140 'token':150 'unclear':236 'unit':82 'usag':220 'usd':86 'usdc':55,84,175 'usdc-micropayment' 'util':13,30,156 'valid':113,158 'varieti':48 'via':89 'wallet':202 'web3':145 'x':108 'x-payment':107 'x402':2,19,39,91 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"9e6907a5-9d2b-4ac0-b129-23540a44dc1c","listingId":"c508d3c0-3a7a-4bf3-8c7b-afdcfc274ecf","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:14.934Z"}],"sources":[{"listingId":"c508d3c0-3a7a-4bf3-8c7b-afdcfc274ecf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:14.934Z","lastSeenAt":"2026-04-25T03:02:23.327Z"}],"details":{"listingId":"c508d3c0-3a7a-4bf3-8c7b-afdcfc274ecf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/57 \\\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 challenge requiring up to 20,000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/57"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/57"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Programmatic micropayment-gated data retrieval on Base L2","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents needing keyless, pay-per-call API access","Low-volume consumers who want no subscription commitments"],"notFor":["High-volume production workloads requiring documented SLAs and schemas","Users who need detailed API documentation or request/response contracts before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.446Z"},"updatedAt":"2026-04-25T03:02:23.327Z"}}