{"id":"550687e4-cce0-49f2-8e26-653782a4159c","shortId":"H4bZCK","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 a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/93` 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 endpoints are listed at the same $0.02/request price point. However, the specific functionality behind `/api/v1/cards/93` is not documented beyond the generic \"Premium API Access\" label, so what this particular endpoint returns is unclear.\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 description of what data or service this endpoint provides. The endpoint is live and correctly returns a 402 challenge, but without documentation it is difficult to know what to send in the POST body or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-call API","Base USDC API"],"warnings":["The specific functionality of /api/v1/cards/93 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI schema, request examples, or response examples exist anywhere in the crawled material.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.","The broader platform lists many endpoint categories but none are documented beyond a name and price."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/93","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what this specific endpoint does, what request body it expects, or what it returns. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34,155 '0.02':16,33,76,154 '000':80 '20':79 '402':232 '6':86 'Base USDC API' 'access':71,172 'advertis':109 'ai':10,27,121 'analysi':125 'analyt':115 'api':4,21,41,70,97,171,188 'base':7,24,59,81 'behind':49,162 'beyond':167 'bodi':248 'broader':107 'call':78 'categori':111 'challeng':233 'classif':128 'connect':197 'content':203 'convers':145 'correct':229 'cost':73 'data':9,26,114,118,218 'decim':87 'descript':215 'detail':214 'difficult':239 'doc':187 'document':166,182,236 'embed':129 'endpoint':14,31,48,63,113,148,178,222,225 'estim':139 'exact':94 'exampl':211 'exchang':134 'expect':253 'export':119 'extrem':184 'feed':133 'financ':11,28,130 'four':110 'function':161 'gas':138 'gate':3,20,44 'generat':146 'generic':169 'geocod':143 'handl':90 'howev':158 'infrastructur':141 'insight':120 'json-response' 'key':98 'know':241 'label':173 'learn':123 'limit':101 'list':67,150 'live':227 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'marketplac':42 'metric':116 'micropay':53 'micropayment API' 'network':60 'offer':8,25 'openapi':207 'page':192 'particular':177 'pay-per-call API' 'payment':88 'per':51,77 'per-request':50 'per-request-micropayment' 'platform':5,22,108 'point':157 'post':247 'post-endpoint' 'premium':69,170 'price':132,156,189 'prompt':199 'protocol':40 'provid':223 'quot':137 'rate':100,135 'readm':191 'render':194 'report':117 'request':52 'request/response':210 'requir':105 'respons':251 'return':179,230 'schema':208 'scheme':95 'send':244 'sentiment':124 'servic':220 'settl':54 'spars':185 'specif':62,160 'subscript':104 'summar':127 'text':126 'token':136 'unclear':181 'unit':82 'usdc':56,84 'usdc-base' 'util':13,30,142 'valid':144 'varieti':46 'via':91 'wallet':198 'web3':131 'without':235 'x402':2,19,39,93 'x402 API marketplace' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"1ead0add-5d9c-4f9b-a601-dfb890ee6441","listingId":"550687e4-cce0-49f2-8e26-653782a4159c","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:00.690Z"}],"sources":[{"listingId":"550687e4-cce0-49f2-8e26-653782a4159c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:00.690Z","lastSeenAt":"2026-04-22T10:01:41.171Z"}],"details":{"listingId":"550687e4-cce0-49f2-8e26-653782a4159c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/93 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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","source_url":"https://lowpaymentfee.com/api/v1/cards/93"},{"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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/93"}],"useCases":["Accessing premium API data without needing API keys or subscriptions","Making one-off paid API calls settled via USDC on Base","Agent-driven workflows that need pay-per-request access to miscellaneous endpoints"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents with x402-compatible wallets on Base","Quick prototyping without subscription commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.626Z"},"updatedAt":"2026-04-22T10:01:41.171Z"}}