{"id":"dbad46d6-0b54-40bb-aaed-fc53fa4ee8fd","shortId":"Bd72Cv","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"lowpaymentfee.com is a platform offering a suite of pay-per-request APIs gated via the x402 protocol on the Base network. The specific endpoint at `/api/v1/policies/54` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.\n\nThe broader platform advertises 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 (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 functionality behind `/api/v1/policies/54` is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a valid x402 challenge), but what data or service it actually returns upon payment is unknown.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-payment","base-network","json-response","no-api-key"],"categories":["api-gateway","pay-per-use"],"synonyms":["low payment fee","x402 api","micropayment api","pay per request","USDC api","base network api","premium api access"],"warnings":["The actual functionality behind /api/v1/policies/54 is completely undocumented — it is unclear what data or service is returned upon successful payment.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema, no request body schema, and no response examples are available.","The platform lists many endpoints across categories but none have detailed documentation visible in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/54","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/policies/54","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 challenge and clear pricing ($0.02 USDC per request on Base). However, there is no documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The specific resource '/api/v1/policies/54' has no description beyond its generic title, making it essentially a stub 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'0.02':10,24,96,144 '000':86 '0x8335':74 '20':85 '2913':75 '402':67 '6':93 'USDC api' 'access':6,20,61,173 'across':104 'actual':216 'addit':198 'advertis':102 'ai':114 'amount':80 'analysi':118 'analyt':108 'api':5,19,41,60,149,172,187 'base':8,22,49,77,87 'base network api' 'base-network' 'behind':162 'beyond':167 'broader':100 'call':83 'categori':106 'challeng':68,209 'classif':121 'commit':157 'confirm':203 'connect':193 'content':199 'contract':73 'convers':137 'data':107,111,212 'decim':94 'doc':184 'document':166 'embed':122 'endpoint':53,103,140,201 'equal':95 'estim':132 'exampl':181 'exchang':127 'export':112 'feed':126 'financ':123 'four':105 'function':161 'gas':131 'gate':3,17,42 'generat':138 'generic':169 'geocod':135 'howev':158 'infrastructur':134 'insight':113 'json-response' 'key':150 'label':170 'learn':116 'limit':153 'list':57,142 'live':204 'low payment fee' 'lowpaymentfee.com':29 'machin':115 'maximum':79 'metric':109 'micropayment api' 'minimum':156 'network':50 'no-api-key' 'offer':33 'openapi':177 'page':188 'pay':9,23,38 'pay per request' 'pay-per-request':37 'payment':70,219 'per':11,25,39,82,97,145 'per-request-billing' 'platform':32,101 'premium':4,18,59,171 'premium api access' 'price':125,185 'prompt':195 'protocol':46 'quot':130 'rate':128,152 'render':190 'report':110 'request':12,26,40,69,98,146 'request/response':180 'requir':81 'return':63,205,217 'schema':178 'sentiment':117 'servic':214 'specif':52,160 'standard':65 'suit':35 'summar':120 'text':119 'token':129 'unit':88 'unknown':221 'upon':218 'usdc':14,28,72,90 'usdc-payment' 'valid':136,207 'via':43 'wallet':194 'web3':124 'x402':2,16,45,66,208 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"df491f30-796f-4030-acd0-dd642eabea13","listingId":"dbad46d6-0b54-40bb-aaed-fc53fa4ee8fd","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/policies/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:10.482Z"}],"sources":[{"listingId":"dbad46d6-0b54-40bb-aaed-fc53fa4ee8fd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:10.482Z","lastSeenAt":"2026-04-23T05:01:28.102Z"}],"details":{"listingId":"dbad46d6-0b54-40bb-aaed-fc53fa4ee8fd","quickStartSnippet":"# 1. Send a POST to discover the x402 payment challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/54\n# Returns 402 with x402 challenge JSON.\n# 2. Construct an X-PAYMENT header per x402 spec,\n#    paying 20000 base-units USDC on Base to 0x1A2B...85F3\n# 3. Replay the POST with the header to receive the response.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/54"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/54"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for API access without needing an API key or subscription","Programmatic agent-driven API consumption settled in USDC on Base","Accessing premium data or services with crypto micropayments"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","Anyone requiring non-crypto payment methods","Use cases needing high-throughput batch access at volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.989Z"},"updatedAt":"2026-04-23T05:01:28.102Z"}}