{"id":"a0976d86-3e93-4740-8962-249d445cc1a8","shortId":"uWpLmy","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 payment challenge. The specific endpoint `/api/v1/carts/76` accepts POST requests and charges up to 0.02 USDC per call (maxAmountRequired of 20000 in USDC's 6-decimal representation) on the Base network. Payment is made via the x402 \"exact\" scheme to the specified wallet address, settling in USDC (contract 0x8335…2913).\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific endpoint `/api/v1/carts/76` is labeled only as \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no example request/response payloads, and no description of the input or output format beyond `application/json`. The actual behavior of this endpoint remains unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api","payment"],"synonyms":["x402 API","pay-per-request API","USDC API","Base network API","lowpaymentfee","premium API","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or output schema describing what this endpoint returns","The endpoint path '/api/v1/carts/76' does not match any of the advertised API categories on the homepage","Actual functionality of this specific endpoint is unknown — 'Premium API Access' is not descriptive","Cannot verify what data or service is provided in exchange for payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/76","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/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI spec, no example payloads, no docs pages with content — only a 'Connect wallet' stub. The 'Premium API Access' label is uninformative. This is effectively a stub 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'0.02':53,140 '0x8335':87 '20000':59 '2913':88 '6':63 'Base network API' 'USDC API' 'accept':46 'access':6,20,36,165 'actual':216 'address':82 'advertis':93 'ai':109 'analysi':113 'analyt':103 'api':5,19,35,100,145,164,179 'application/json':214 'avail':224 'base':8,22,68 'base-network' 'behavior':217 'behind':37 'beyond':213 'broader':90 'call':56 'challeng':41 'charg':50 'classif':116 'commit':153 'connect':188 'content':194 'contract':86 'convers':133 'data':102,106,172 'decim':64 'descript':206 'doc':178 'document':169 'embed':117 'endpoint':30,44,136,157,220 'estim':127 'exact':76 'exampl':201 'exchang':122 'export':107 'feed':121 'financ':118 'format':212 'function':174 'gas':126 'gate':3,17,99 'generat':134 'geocod':131 'howev':154 'infrastructur':129 'input':209 'insight':108 'json-response' 'key':146 'label':160 'learn':111 'limit':149 'list':138 'lowpaymentfee' 'lowpaymentfee.com':32,91 'machin':110 'made':72 'materi':225 'maxamountrequir':57 'metric':104 'micropayment API' 'minimum':152 'network':69 'no-api-key' 'openapi':198 'output':211 'page':183 'paid':9,23 'pay-per-request API' 'payload':203 'payment':40,70 'per':11,25,55,141 'per-request':10,24 'per-request-billing' 'platform':92 'post':47 'post-method' 'premium':4,18,34,163 'premium API' 'price':120,180 'prompt':190 'provid':33 'quot':125 'rate':123,148 'readm':182 'remain':221 'render':185 'report':105 'represent':65 'request':12,26,48,142 'request/response':202 'return':176 'schema':199 'scheme':77 'sentiment':112 'settl':83 'span':101 'specif':43,156 'specifi':80 'substant':193 'suit':95 'summar':115 'text':114 'token':124 'unclear':222 'usdc':14,28,54,61,85 'usdc-payment' 'util':130 'valid':132 'via':73 'wallet':81,189 'web3':119 'x402':2,16,39,75,98 'x402 API' 'x402-gated':1,15,97 'x402-payment'","prices":[{"id":"5baa2b97-7420-4436-a87e-42de78db8e3a","listingId":"a0976d86-3e93-4740-8962-249d445cc1a8","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/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:15.882Z"}],"sources":[{"listingId":"a0976d86-3e93-4740-8962-249d445cc1a8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:15.882Z","lastSeenAt":"2026-04-23T02:00:19.136Z"}],"details":{"listingId":"a0976d86-3e93-4740-8962-249d445cc1a8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/76 \\\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 402 challenge with maxAmountRequired of 20000 USDC (0.02 USDC) on Base network using the exact scheme","source_url":"https://lowpaymentfee.com/api/v1/carts/76"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402 payment flows into agent-based workflows","Accessing premium data or services via USDC micropayments on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone requiring non-crypto payment methods","Production workloads needing well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:01:51.99Z"},"updatedAt":"2026-04-23T02:00:19.136Z"}}