{"id":"7dc7bffa-e780-4b2e-98de-35ef64fa67a6","shortId":"9DeGAW","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/79` is listed as \"Premium API Access\" and costs $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 per request price point. The endpoint accepts HTTP POST requests and returns `application/json` responses.\n\nDocumentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind the `/api/v1/cards/79` path is unclear; the generic \"Premium API Access\" label does not describe what data or service it returns. Prospective users should be aware that without documentation, integration requires experimentation after payment.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","http-post","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","402 payment endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.","The specific function of /api/v1/cards/79 ('Premium API Access') is undocumented; it is unclear what data or service it provides.","No OpenAPI spec or request/response schema is published.","No example requests or responses are available to verify endpoint behavior."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/79","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/79","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 no documentation, no OpenAPI spec, no request/response examples, and the purpose of `/api/v1/cards/79` is entirely opaque. The docs/pricing/README pages are all blank beyond a wallet-connect 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'/request':17,34 '0.02':16,33,76,154 '000':80 '20':79 '402 payment endpoint' '6':86 'Base network API' 'USDC API access' 'accept':161 'access':45,73,223 'addit':193 'advertis':109 'ai':10,27,121 'analysi':125 'analyt':115 'api':4,21,41,72,97,179,222 'application/json':167 'avail':209 'awar':238 'base':7,24,61,81 'behind':51,213 'beyond':170 'broader':107 'call':78 'categori':111 'classif':128 'connect':188 'convers':145 'cost':75 'data':9,26,114,118,229 'decim':87 'describ':227 'detail':195 'doc':178 'document':169,204,241 'embed':129 'endpoint':14,31,50,65,113,148,160 'estim':139 'exact':94 'exampl':207 'exchang':134 'experiment':244 'export':119 'extrem':175 'feed':133 'financ':11,28,130 'four':110 'function':212 'gas':138 'gate':3,20,44 'generat':146 'generic':220 'geocod':143 'handl':90 'http':162 'http-post' 'infrastructur':141 'insight':120 'integr':242 'json-api' 'key':98 'label':224 'land':172 'learn':123 'limit':101 'list':69,150 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'marketplac':42 'metric':116 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':199 'page':173,183 'path':216 'pay-per-request API' 'payload':208 'payment':88,246 'per':53,77,155 'per-request':52 'per-request-micropayment' 'platform':5,22,108 'point':158 'post':163 'premium':71,221 'price':132,157,180 'prompt':190 'prospect':234 'protocol':40 'quot':137 'rate':100,135 'readm':182 'render':185 'report':117 'request':54,156,164 'request/response':202 'requir':105,243 'respons':168 'return':166,233 'schema':203 'scheme':95 'sentiment':124 'servic':231 'settl':56 'spars':176 'spec':200 'specif':64,211 'subscript':104 'summar':127 'technic':194 'text':126 'token':136 'unclear':218 'unit':82 'usdc':58,84 'usdc-base' 'user':235 'util':13,30,142 'valid':144 'varieti':48 'via':91 'wallet':189 'web3':131 'without':240 'x402':2,19,39,93 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"27275474-2273-4a26-a523-abcec5c961dd","listingId":"7dc7bffa-e780-4b2e-98de-35ef64fa67a6","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:03.685Z"}],"sources":[{"listingId":"7dc7bffa-e780-4b2e-98de-35ef64fa67a6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:03.685Z","lastSeenAt":"2026-04-23T02:31:12.041Z"}],"details":{"listingId":"7dc7bffa-e780-4b2e-98de-35ef64fa67a6","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# After constructing a valid X-PAYMENT header (USDC on Base, $0.02):\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/79 \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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 x402Version 1, exact scheme, on Base network, with maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/cards/79"},{"claim":"All listed endpoints cost $0.02 per 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":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no additional documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without subscription or API key management","Making one-off paid API calls settled instantly in USDC on Base","Integrating pay-per-call endpoints into autonomous agent workflows"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.509Z"},"updatedAt":"2026-04-23T02:31:12.041Z"}}