{"id":"22480598-e5c9-4235-aa87-766b960747fd","shortId":"SetXpf","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/73` 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 made via the x402 `exact` scheme with no API keys, no rate limits, and no upfront commitments required.\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 listed endpoints share the same $0.02/request pricing. The endpoint is live and returns a proper 402 challenge when called without payment.\n\nNote that the specific functionality behind `/api/v1/cards/73` is not documented beyond the generic \"Premium API Access\" label. 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 technical detail. Agents should treat this endpoint with caution until more documentation is available.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No documentation available for /api/v1/cards/73 — the specific functionality behind 'Premium API Access' is unknown.","Docs, pricing, API, and README pages all render only 'Connect wallet' with no technical content.","No OpenAPI spec or request/response schema provided.","The endpoint path '/api/v1/cards/73' does not match any of the advertised API categories on the homepage, raising questions about what it actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/73","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, no documentation of what /api/v1/cards/73 actually returns, and the docs pages are empty beyond a wallet connect prompt. The listing is effectively a stub with confirmed 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'/request':17,34,162 '0.02':16,33,78,93,161 '000':84 '20':83 '402':172 '402 payment api' '6':91 'access':45,73,193 'addit':219 'advertis':117 'agent':222 'ai':10,27,129 'analysi':133 'analyt':123 'api':4,21,41,72,104,192,208 'avail':233 'base':7,24,61,85 'base network api' 'behind':51,183 'beyond':188 'broader':115 'call':80,175 'categori':119 'caution':228 'challeng':173 'classif':136 'commit':112 'connect':214 'convers':153 'cost':75 'data':9,26,122,126 'decim':92 'detail':221 'doc':205 'document':187,231 'embed':137 'endpoint':14,31,50,65,121,157,165,226 'estim':147 'exact':100 'exampl':202 'exchang':142 'export':127 'feed':141 'financ':11,28,138 'four':118 'function':182 'gas':146 'gate':3,20,44 'generat':154 'generic':190 'geocod':151 'infrastructur':149 'insight':128 'json-response' 'key':105 'label':194 'learn':131 'limit':108 'list':69,156 'live':167 'low payment fee' 'lowpaymentfee.com':35 'machin':130 'made':96 'marketplac':42 'maxamountrequir':81 'metric':124 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'no-rate-limit' 'note':178 'offer':8,25 'openapi':198 'page':209 'pay-per-request api' 'payment':94,177 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,116 'post-endpoint' 'premium':71,191 'price':140,163,206 'prompt':216 'proper':171 'protocol':40 'quot':145 'rate':107,143 'render':211 'report':125 'request':54 'request/response':201 'requir':113 'return':169 'schema':199 'scheme':101 'sentiment':132 'settl':56 'share':158 'specif':64,181 'summar':135 'technic':220 'text':134 'token':144 'treat':224 'unit':86 'upfront':111 'usdc':58,88 'usdc api access' 'usdc-base' 'util':13,30,150 'valid':152 'varieti':48 'via':97 'wallet':215 'web3':139 'without':176 'x402':2,19,39,99 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"864ab023-14cf-4f79-88eb-17ca97b6e6dd","listingId":"22480598-e5c9-4235-aa87-766b960747fd","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:44.880Z"}],"sources":[{"listingId":"22480598-e5c9-4235-aa87-766b960747fd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:44.880Z","lastSeenAt":"2026-04-23T02:31:11.051Z"}],"details":{"listingId":"22480598-e5c9-4235-aa87-766b960747fd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/73 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network using the exact scheme.","source_url":"https://lowpaymentfee.com/api/v1/cards/73"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals.","source_url":"https://lowpaymentfee.com/api/v1/cards/73"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents with a low-cost endpoint marketplace","Accessing data, AI, finance, or utility services via micropayments on Base"],"bestFor":["Agents that support x402 payment protocol and want frictionless API access","Developers exploring pay-per-use API models without signup","Low-volume or sporadic API consumers who want to avoid subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone unable to settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.484Z"},"updatedAt":"2026-04-23T02:31:11.051Z"}}