{"id":"cafae3a9-7e0f-434b-8362-6208dcc0fecf","shortId":"tNfCrq","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 micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/35` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header with a signed payment to the payTo address, and the endpoint returns JSON.\n\nThe broader platform advertises four categories of APIs: 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. The platform emphasizes no API keys, no rate limits, no minimums, and instant access.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The specific functionality behind `/api/v1/cards/35` (\"Premium API Access\") is not described beyond its title, so its actual behavior is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","http-post"],"categories":["api-marketplace","misc"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /api/v1/cards/35","The purpose of the 'Premium API Access' endpoint at /api/v1/cards/35 is completely undocumented","Cannot verify what data or service this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/35","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/cards/35","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 zero documentation on what /api/v1/cards/35 actually returns, no OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The actual functionality is 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'/api/v1/cards/35':66,228 '/docs':192 '/pricing':194 '/readme':196 '/request':17,34,170 '0.02':16,33,77,92,169 '000':83 '20':82 '6':90 'access':44,72,186,231 'actual':240 'address':115 'advertis':124 'ai':10,27,136 'analysi':140 'analyt':130 'api':4,21,40,71,128,177,230 'attach':102 'base':7,24,60,84 'base network api' 'behavior':241 'behind':50,227 'beyond':235 'broader':122 'call':79 'caller':101 'categori':126 'classif':143 'connect':202 'content':208 'convers':160 'cost':74 'data':9,26,129,133 'decim':91 'describ':234 'detail':219 'document':187,220 'embed':144 'emphas':175 'endpoint':14,31,49,64,118,163,223 'estim':154 'exact':99 'exampl':216 'exchang':149 'export':134 'extrem':189 'feed':148 'financ':11,28,145 'four':125 'function':226 'gas':153 'gate':3,20,43 'generat':161 'geocod':158 'handl':95 'header':107 'http-post' 'infrastructur':156 'insight':135 'instant':185 'json':120 'json-response' 'key':178 'learn':138 'limit':181 'list':68,165 'low payment fee' 'lowpaymentfee.com':35 'machin':137 'marketplac':41 'maxamountrequir':80 'metric':131 'micropay':54 'micropayment api' 'minimum':183 'network':61 'offer':8,25 'openapi':212 'page':197 'pay-per-request api' 'payment':93,106,111 'payto':114 'per':52,78 'per-request':51 'per-request-micropayment' 'platform':5,22,123,174 'point':172 'premium':70,229 'price':147,171 'prompt':204 'protocol':39 'quot':152 'rate':150,180 'render':199 'report':132 'request':53 'request/response':215 'return':119 'schema':213 'scheme':100 'sentiment':139 'settl':55 'sign':110 'spars':190 'specif':63,225 'summar':142 'text':141 'titl':237 'token':151 'unit':85 'unknown':243 'usdc':57,87 'usdc api access' 'usdc-base' 'util':13,30,157 'valid':159 'varieti':47 'via':96 'wallet':203 'web3':146 'x':105 'x-payment':104 'x402':2,19,38,98 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"1fd07637-e586-4c10-ae9c-95753a17c72d","listingId":"cafae3a9-7e0f-434b-8362-6208dcc0fecf","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/cards/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:26.205Z"}],"sources":[{"listingId":"cafae3a9-7e0f-434b-8362-6208dcc0fecf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:26.205Z","lastSeenAt":"2026-04-22T10:31:28.320Z"}],"details":{"listingId":"cafae3a9-7e0f-434b-8362-6208dcc0fecf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/35"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/35"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Accessing data, AI, finance, or utility endpoints via x402 micropayments","Integrating agent-purchasable API calls settled on Base L2"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-call API access without signup"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may not be cost-effective","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.273Z"},"updatedAt":"2026-04-22T10:31:28.320Z"}}