{"id":"0cc96a01-8966-44cb-877e-e21732943831","shortId":"bXMnLv","kind":"x402","title":"x402-gated API suite: analytics, AI, finance, and utility endpoints at $0.02/request on Base.","tagline":"x402-gated API suite: analytics, AI, finance, and utility endpoints at $0.02/request on Base.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/cards/40` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises endpoints across four categories: 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 content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/cards/40` endpoint specifically returns. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what data or functionality \"Premium API Access\" actually provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of '/api/v1/cards/40' ('Premium API Access') is completely undocumented","Cannot verify what data or functionality any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/40","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/40","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 challenge, but documentation is effectively 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/40' actually returns. The listing is a 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'/request':14,30,157 '0.02':13,29,83,156 '000':77 '20':76 '402':205 'Base network API' 'USDC API' 'access':67,220 'across':113 'actual':221 'advertis':93,111 'ai':7,23,123 'analysi':127 'analyt':6,22,117 'api':4,20,42,66,87,166,219 'attach':96 'base':16,32,55,78 'base-network' 'broader':109 'call':41,85 'caller':94 'captur':207 'categori':115 'challeng':72,206 'classif':130 'collect':36 'confirm':203 'connect':175 'content':181 'convers':147 'data':116,120,215 'descript':192 'doc':165 'document':160,210 'embed':131 'endpoint':11,27,43,59,112,150,197,201 'estim':141 'exampl':189 'exchang':136 'export':121 'extrem':162 'feed':135 'financ':8,24,132 'four':114 'function':217 'gas':140 'gate':3,19,44 'generat':148 'geocod':145 'header':101 'i.e':82 'infrastructur':143 'insight':122 'json-response' 'key':88 'learn':125 'limit':91 'list':63,152 'live':204 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':124 'metric':118 'micropayment API' 'network':56 'no-api-key' 'offer':34 'openapi':185 'page':170 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payment':50,100,106 'per':40,84 'platform':110 'point':159 'premium':65,218 'price':134,158,167 'prompt':177 'proof':107 'protocol':48 'provid':222 'quot':139 'rate':90,137 'readm':169 'render':172 'report':119 'request':73 'request/response':188 'return':69,199 'schema':186 'sentiment':126 'settl':49 'simpli':95 'spars':163 'specif':58,198 'suit':5,21 'summar':129 'text':128 'token':138 'unclear':213 'unit':79 'usdc':52,81 'usdc-settlement' 'util':10,26,144 'valid':104,146 'wallet':176 'web3':133 'without':209 'x':99 'x-payment':98 'x402':2,18,47,71,105 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"890a7d41-8047-443e-92f7-02b7cbab1f8c","listingId":"0cc96a01-8966-44cb-877e-e21732943831","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:31.005Z"}],"sources":[{"listingId":"0cc96a01-8966-44cb-877e-e21732943831","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:31.005Z","lastSeenAt":"2026-04-22T10:01:39.919Z"}],"details":{"listingId":"0cc96a01-8966-44cb-877e-e21732943831","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/40 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/40"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/40"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need on-demand endpoint access settled in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integration","Agents that need keyless, per-request API access on Base","Low-volume callers who prefer pay-as-you-go over subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads requiring well-documented, battle-tested APIs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.067Z"},"updatedAt":"2026-04-22T10:01:39.919Z"}}