{"id":"a3d1ff81-b8b9-43e8-926c-3ee0a0473aef","shortId":"RaugQa","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 paywall on the Base network. The specific endpoint `/api/v1/carts/64` accepts POST requests and charges up to 0.02 USDC per call (maxAmountRequired of 20000 in USDC's 6-decimal representation). Payment is settled on-chain to a specified address using the \"exact\" scheme, with USDC (contract 0x8335…2913) as the payment asset.\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 `/api/v1/carts/64` endpoint 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 additional content. There is no OpenAPI schema, no example request/response documentation, and no description of the input parameters or output format for this particular endpoint. The endpoint is confirmed live (returns a valid 402 challenge), but its actual behavior after payment is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The endpoint path '/api/v1/carts/64' does not match any of the advertised API categories on the homepage","No OpenAPI or output schema describing what this endpoint returns after successful payment","Actual functionality behind the paywall is completely unknown from crawled materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/64","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does or returns. The label \"Premium API Access\" is generic. No OpenAPI schema, no example responses, and all doc pages render only a wallet-connect prompt. The actual utility of this specific endpoint cannot be determined from available 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'0.02':56,143 '0x8335':86 '20000':62 '2913':87 '402':229 '6':66 'Base network API' 'USDC API access' 'accept':49 'access':6,20,36,168 'actual':233 'addit':196 'address':78 'advertis':96 'ai':112 'analysi':116 'analyt':106 'api':5,19,35,103,148,167,182 'asset':91 'avail':240 'base':8,22,43 'base-network' 'behavior':234 'behind':37 'broader':93 'call':59 'chain':74 'challeng':230 'charg':53 'classif':119 'commit':156 'confirm':224 'connect':191 'content':197 'contract':85 'convers':136 'data':105,109,175 'decim':67 'descript':209 'doc':181 'document':172,206 'embed':120 'endpoint':30,47,139,161,220,222 'estim':130 'exact':81 'exampl':204 'exchang':125 'export':110 'feed':124 'financ':121 'format':216 'function':177 'gas':129 'gate':3,17,102 'generat':137 'geocod':134 'howev':157 'infrastructur':132 'input':212 'insight':111 'key':149 'label':163 'learn':114 'limit':152 'list':141 'live':225 'lowpaymentfee' 'lowpaymentfee.com':32,94 'machin':113 'materi':241 'maxamountrequir':60 'metric':107 'micropayment API' 'minimum':155 'network':44 'no-api-key' 'on-chain':72 'openapi':201 'output':215 'page':186 'paid':9,23 'paramet':213 'particular':219 'pay-per-request API' 'payment':69,90,236 'paywal':40 'per':11,25,58,144 'per-request':10,24 'per-request-billing' 'platform':95 'post':50 'post-endpoint' 'premium':4,18,34,166 'price':123,183 'prompt':193 'provid':33 'quot':128 'rate':126,151 'readm':185 'render':188 'report':108 'represent':68 'request':12,26,51,145 'request/response':205 'return':179,226 'schema':202 'scheme':82 'sentiment':115 'settl':71 'span':104 'specif':46,159 'specifi':77 'suit':98 'summar':118 'text':117 'token':127 'unknown':238 'usdc':14,28,57,64,84 'usdc-payment' 'use':79 'util':133 'valid':135,228 'wallet':192 'web3':122 'x402':2,16,39,101 'x402 API' 'x402-gated':1,15,100 'x402-payment'","prices":[{"id":"94171d05-80dd-4ced-b87c-3ebb5076babd","listingId":"a3d1ff81-b8b9-43e8-926c-3ee0a0473aef","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:14.094Z"}],"sources":[{"listingId":"a3d1ff81-b8b9-43e8-926c-3ee0a0473aef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:14.094Z","lastSeenAt":"2026-04-24T13:31:32.131Z"}],"details":{"listingId":"a3d1ff81-b8b9-43e8-926c-3ee0a0473aef","quickStartSnippet":"# The endpoint returns a 402 challenge. Supply an X-PAYMENT header with a valid x402 payment proof.\ncurl -X POST https://lowpaymentfee.com/api/v1/carts/64 \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired 20000 USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/64"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/64"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API keys","On-chain pay-as-you-go access to web services"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible clients on the Base network","Scenarios requiring no upfront commitment or rate-limit constraints"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","Use cases requiring free or fiat-only payment methods","Anyone needing to understand the exact response schema before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.279Z"},"updatedAt":"2026-04-24T13:31:32.131Z"}}