{"id":"b8cd9ddf-c2a4-4e51-a7be-063106be01e8","shortId":"rTSrzS","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/68` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions 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. However, the specific functionality behind `/api/v1/cards/68` is not documented beyond the generic \"Premium API Access\" label, and the crawled documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content.\n\nBecause there is no OpenAPI schema, no request/response examples, and no detailed documentation available for this endpoint, its actual behavior and output format remain unclear. The endpoint is confirmed live (returns a valid 402 challenge), but agents should be aware that the lack of documentation makes integration speculative.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","premium api access"],"warnings":["No documentation available — docs, pricing, and README pages all returned only a wallet-connect prompt with no content.","The specific functionality of /api/v1/cards/68 is undocumented; 'Premium API Access' is a generic label.","No OpenAPI schema or request/response examples are provided.","No input schema is documented, so the expected POST body is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/68","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/68","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 402 challenge, but there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect stub. The specific purpose of /api/v1/cards/68 is unknown beyond the generic 'Premium API Access' 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'/request':17,34,156 '0.02':16,33,78,155 '000':82 '20':81 '402':226 '6':88 'access':45,73,172 'actual':211 'advertis':111 'agent':229 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,99,171 'avail':206 'awar':232 'base':7,24,61,83 'base usdc api' 'base-network' 'behavior':212 'behind':51,162 'beyond':167 'broader':109 'call':80 'categori':113 'challeng':227 'classif':130 'confirm':221 'connect':187 'content':192 'convers':147 'cost':75 'crawl':176 'data':9,26,116,120 'decim':89 'detail':204 'doc':179 'document':166,177,205,237 'embed':131 'endpoint':14,31,50,65,115,151,209,219 'estim':141 'exact':96 'exampl':201 'exchang':136 'export':121 'feed':135 'financ':11,28,132 'format':215 'four':112 'function':161 'gas':140 'gate':3,20,44 'generat':148 'generic':169 'geocod':145 'handl':92 'howev':158 'infrastructur':143 'insight':122 'integr':239 'json-response' 'key':100 'label':173 'lack':235 'learn':125 'limit':103 'list':69,150 'live':222 'low payment fee' 'lowpaymentfee.com':35 'machin':124 'make':238 'marketplac':42 'metric':118 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'offer':8,25 'openapi':197 'output':214 'page':178 'pay-per-request api' 'payment':90 'per':53,79 'per-request':52 'per-request-billing' 'platform':5,22,110 'premium':71,170 'premium api access' 'price':134,157,180 'prompt':188 'protocol':40 'quot':139 'rate':102,137 'readm':181 'remain':216 'report':119 'request':54 'request/response':200 'requir':107 'return':182,223 'schema':198 'scheme':97 'sentiment':126 'settl':56 'share':152 'specif':64,160 'specul':240 'subscript':106 'substant':191 'summar':129 'text':128 'token':138 'unclear':217 'unit':84 'usdc':58,86 'usdc-micropayment' 'util':13,30,144 'valid':146,225 'varieti':48 'via':93 'wallet':186 'wallet-connect':185 'web3':133 'x402':2,19,39,95 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"4a349a4c-34e9-4aa6-b665-f5119f0791d4","listingId":"b8cd9ddf-c2a4-4e51-a7be-063106be01e8","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:41.866Z"}],"sources":[{"listingId":"b8cd9ddf-c2a4-4e51-a7be-063106be01e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:41.866Z","lastSeenAt":"2026-04-23T04:31:07.894Z"}],"details":{"listingId":"b8cd9ddf-c2a4-4e51-a7be-063106be01e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/68 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/68"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/68"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Integrating x402-gated endpoints into autonomous agent workflows","Accessing data, AI, finance, or utility services via micropayments on Base"],"bestFor":["Agents that need keyless, pay-as-you-go API access","Developers experimenting with x402 protocol micropayments","Use cases where avoiding subscription commitments is important"],"notFor":["Production workloads requiring well-documented, schema-defined APIs","Users who need detailed request/response contracts before integration","High-volume use cases where per-request pricing may not be cost-effective"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.587Z"},"updatedAt":"2026-04-23T04:31:07.894Z"}}