{"id":"722498ae-a3a7-4e31-a878-c5cf39c63dd8","shortId":"26jK7f","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 `/api/v1/cards/64` 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/request price point.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint at `/api/v1/cards/64` is live and returns a valid x402 402 challenge, but without documentation it is unclear what data or functionality this specific \"cards/64\" resource provides. The POST method is indicated in the outputSchema, and the response MIME type is application/json.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","Base USDC API","cards endpoint","premium API access"],"warnings":["No documentation available — all doc/API/pricing/README pages show only 'Connect wallet' with no content","No OpenAPI or schema specification found for any endpoint","The specific purpose of /api/v1/cards/64 ('Premium API Access') is undefined — unclear what data it returns","Cannot verify that the advertised AI, finance, and data endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/64","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/64","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 with clear pricing, but there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what the /api/v1/cards/64 resource actually returns. The docs pages are all empty wallet-connect stubs. This is effectively a stub 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'/request':17,34,153 '0.02':16,33,74,152 '000':78 '20':77 '402':204 '6':84 'Base USDC API' 'access':44,71 'advertis':107 'ai':10,27,119 'analysi':123 'analyt':113 'api':4,21,40,70,95,162 'application/json':235 'avail':192 'base':7,24,60,79 'behind':50 'broader':105 'call':76 'cards endpoint' 'cards/64':218 'categori':109 'challeng':205 'classif':126 'connect':171 'convers':143 'cost':73 'data':9,26,112,116,213 'decim':85 'detail':178 'doc':161 'document':156,187,208 'embed':127 'endpoint':14,31,49,64,111,146,194 'estim':137 'exact':92 'exampl':190 'exchang':132 'export':117 'extrem':158 'feed':131 'financ':11,28,128 'four':108 'function':215 'gas':136 'gate':3,20,43 'generat':144 'geocod':141 'handl':88 'indic':225 'infrastructur':139 'insight':118 'json-api' 'key':96 'learn':121 'limit':99 'list':67,148 'live':198 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'marketplac':41 'method':223 'metric':114 'micropay':54 'mime':232 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':182 'outputschema':228 'page':166 'pay-per-request API' 'payload':191 'payment':86 'per':52,75 'per-request':51 'per-request-micropayment' 'platform':5,22,106 'point':155 'post':222 'post-method' 'premium':69 'premium API access' 'price':130,154,163 'prompt':173 'protocol':39 'provid':220 'quot':135 'rate':98,133 'readm':165 'render':168 'report':115 'request':53 'request/response':185 'requir':103 'resourc':219 'respons':231 'return':200 'schema':186 'scheme':93 'sentiment':122 'settl':55 'spars':159 'spec':183 'specif':63,217 'subscript':102 'summar':125 'technic':177 'text':124 'token':134 'type':233 'unclear':211 'unit':80 'usdc':57,82 'usdc-base' 'util':13,30,140 'valid':142,202 'varieti':47 'via':89 'wallet':172 'web3':129 'without':207 'x402':2,19,38,91,203 'x402 micropayment API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"4088151d-a29b-4362-9ed6-3582beb04ecd","listingId":"722498ae-a3a7-4e31-a878-c5cf39c63dd8","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:49.765Z"}],"sources":[{"listingId":"722498ae-a3a7-4e31-a878-c5cf39c63dd8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:49.765Z","lastSeenAt":"2026-04-23T02:31:11.387Z"}],"details":{"listingId":"722498ae-a3a7-4e31-a878-c5cf39c63dd8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/64 \\\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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/64"},{"claim":"All endpoints are priced at $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 in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/64"}],"useCases":["Accessing gated API resources with per-call USDC micropayments on Base","Integrating x402-compatible agents that pay for API calls without API keys","Exploring a multi-category API marketplace (data, AI, finance, utilities) with uniform pricing"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-use API access on Base","Low-volume consumers who want no-commitment API access"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLAs or guaranteed uptime","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.191Z"},"updatedAt":"2026-04-23T02:31:11.387Z"}}