{"id":"b99291fe-46ec-435d-b7af-805b7ad6bce7","shortId":"WTZB7M","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/74` 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, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\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/request price point.\n\nHowever, the specific endpoint `/api/v1/cards/74` does not clearly map to any of the named API categories on the landing page. Its description is simply \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, example responses, or detailed documentation, the actual behavior of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","USDC API access","Base network API"],"warnings":["The endpoint path /api/v1/cards/74 does not correspond to any named API on the provider's landing page — its actual functionality is unknown.","No OpenAPI schema, example requests, or example responses are available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","The platform lists many API categories but provides no verifiable evidence that any of them return real data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/74","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and the specific endpoint '/api/v1/cards/74' is not described anywhere on the site. The docs/pricing/README pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34,165 '0.02':16,33,74,164 '000':78 '20':77 '6':84 'Base network API' 'USDC API access' 'access':44,71,194 'account':97 'actual':233 'advertis':119 'ai':10,27,131 'analysi':135 'analyt':125 'api':4,21,40,70,95,123,182,193 'attach':105 'base':7,24,60,79 'behavior':234 'behind':50 'broader':117 'call':76 'caller':103 'categori':121,183 'classif':138 'clear':175 'connect':216 'content':222 'convers':155 'cost':73 'data':9,26,124,128,201 'decim':85 'descript':189 'detail':230 'doc':207 'document':198,231 'embed':139 'endpoint':14,31,49,64,158,171,237 'estim':149 'exact':92 'exampl':227 'exchang':144 'export':129 'feed':143 'financ':11,28,140 'four':120 'function':203 'gas':148 'gate':3,20,43 'generat':156 'geocod':153 'handl':88 'header':110 'howev':168 'infrastructur':151 'insight':130 'json-response' 'key':96 'land':186 'learn':133 'limit':100 'list':67,160 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':132 'map':176 'marketplac':41 'metric':126 'micropay':54 'name':181 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':225 'page':187,211 'pay-per-request API' 'payment':86,109,114 'per':52,75 'per-request':51 'per-request-micropayment' 'platform':5,22,118 'point':167 'premium':69,192 'price':142,166,208 'prompt':218 'proof':115 'protocol':39 'quot':147 'rate':99,145 'readm':210 'remain':238 'render':213 'report':127 'request':53 'requir':102 'respons':228 'return':205 'schema':226 'scheme':93 'sentiment':134 'settl':55 'simpli':104,191 'specif':63,170 'substant':221 'summar':137 'text':136 'token':146 'unit':80 'unknown':239 'usdc':57,82 'usdc-base' 'util':13,30,152 'valid':113,154 'varieti':47 'via':89 'wallet':217 'web3':141 'without':223 'x':108 'x-payment':107 'x402':2,19,38,91 'x402 micropayment API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"802b4066-28c3-41fa-8108-cf0654e7ced4","listingId":"b99291fe-46ec-435d-b7af-805b7ad6bce7","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:43.072Z"}],"sources":[{"listingId":"b99291fe-46ec-435d-b7af-805b7ad6bce7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:43.072Z","lastSeenAt":"2026-04-23T04:01:14.482Z"}],"details":{"listingId":"b99291fe-46ec-435d-b7af-805b7ad6bce7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/74 \\\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 a 402 x402 challenge with maxAmountRequired of 20000 in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/74"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without account registration","Agent-driven API consumption with per-call USDC micropayments on Base","Exploring x402 protocol integration for pay-as-you-go services"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible wallets and agents on the Base network","Low-volume consumers who prefer no subscriptions or commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.501Z"},"updatedAt":"2026-04-23T04:01:14.482Z"}}