{"id":"0404ceb3-41f4-4948-8338-4ed647f1414e","shortId":"LTwdxB","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 platform 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/45` 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 APIs: 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.\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 description of what the `/api/v1/cards/45` endpoint specifically returns. The endpoint is live and responds with a valid x402 402 challenge, but without documentation it is unclear what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","finance-data","crypto-data","geocoding","text-summarization","sentiment-analysis","embeddings","classification"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /api/v1/cards/45","The specific purpose of the /api/v1/cards/45 endpoint is unknown beyond the generic label 'Premium API Access'","Cannot verify that the advertised AI, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/45","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/45","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 it accepts USDC payments on Base. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/cards/45 actually returns. The listing is effectively a stub with confirmed 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'/request':17,34 '0.02':16,33,76,154 '000':80 '20':79 '402':209 '6':86 'access':45,73 'advertis':109 'ai':10,27,121 'ai-inference' 'analysi':125 'analyt':115 'api':4,21,41,72,97,113,165 'base':7,24,61,81 'base usdc api' 'behind':51 'broader':107 'call':78 'categori':111 'challeng':210 'classif':128 'classification' 'connect':174 'content':180 'convers':145 'cost':75 'crypto-data' 'data':9,26,114,118 'data-analytics' 'decim':87 'descript':191 'doc':164 'document':159,213 'embed':129 'embeddings' 'endpoint':14,31,50,65,148,196,200 'estim':139 'exact':94 'exampl':188 'exchang':134 'expect':225 'export':119 'extrem':161 'feed':133 'financ':11,28,130 'finance-data' 'four':110 'gas':138 'gate':3,20,44 'generat':146 'geocod':143 'geocoding' 'handl':90 'infrastructur':141 'insight':120 'key':98 'learn':123 'limit':101 'list':69,150 'live':202 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'metric':116 'micropay':55 'micropayment api' 'network':62 'offer':8,25 'openapi':184 'page':169 'pay-per-request api' 'payload':218 'payment':88 'per':53,77,155 'per-request':52 'per-request-micropayment' 'platform':5,22,42,108 'point':158 'premium':71 'price':132,157,166 'prompt':176 'protocol':40 'quot':137 'rate':100,135 'readm':168 'render':171 'report':117 'request':54,156 'request/response':187 'requir':105 'respond':204 'respons':223 'return':198 'schema':185 'scheme':95 'send':220 'sentiment':124 'sentiment-analysis' 'settl':56 'spars':162 'specif':64,197 'subscript':104 'summar':127 'text':126 'text-summarization' 'token':136 'unclear':216 'unit':82 'usdc':58,84 'usdc-base' 'util':13,30,142 'valid':144,207 'varieti':48 'via':91 'wallet':175 'web3':131 'without':212 'x402':2,19,39,93,208 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"8479bff2-7deb-4bb6-81c4-945bb4abbe89","listingId":"0404ceb3-41f4-4948-8338-4ed647f1414e","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:30.389Z"}],"sources":[{"listingId":"0404ceb3-41f4-4948-8338-4ed647f1414e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:30.389Z","lastSeenAt":"2026-04-23T11:03:18.032Z"}],"details":{"listingId":"0404ceb3-41f4-4948-8338-4ed647f1414e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/45 \\\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/45"},{"claim":"All endpoints are listed 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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure utility API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/45"}],"useCases":["Accessing data analytics and reports without API key management","Running AI inference (sentiment, summarization, classification, embeddings) via pay-per-call","Fetching crypto token quotes and gas estimates on demand","Geocoding and data conversion utilities with no subscription"],"bestFor":["Agents or developers wanting zero-signup, pay-per-use API access","Prototyping workflows that need diverse utility endpoints without rate limits","x402-native agents that can settle USDC micropayments on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.101Z"},"updatedAt":"2026-04-23T11:03:18.032Z"}}