{"id":"96ab0b99-d76b-40a7-a801-529f35fd37c9","shortId":"TcBWxb","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/59` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint `/api/v1/cards/59` does not clearly map to any of these named categories — it may be a generic or card-based resource. No OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl; the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","USDC API access","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific resource at /api/v1/cards/59 has no description beyond 'Premium API Access' — its actual functionality is unknown","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no content","No example request or response payloads are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/59","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/59","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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response payloads, and the specific purpose of `/api/v1/cards/59` is unclear. The docs/pricing/README pages are empty 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'/request':17,34,172 '0.02':16,33,95,171 '000':87 '0x8335':92 '20':86 '6':100 'Base network API' 'USDC API access' 'accept':75 'access':45,73 'advertis':81,127 'ai':10,27,139 'analysi':143 'analyt':133 'api':4,21,41,72,103,215 'attach':112 'base':7,24,61,88,197 'behind':51 'broader':125 'caller':110 'card':196 'card-bas':195 'categori':129,188 'challeng':80 'classif':146 'clear':181 'connect':224 'content':230 'convers':163 'cost':84 'crawl':212 'data':9,26,132,136 'decim':101 'detail':202 'doc':214 'document':203 'embed':147 'endpoint':14,31,50,65,131,167,177 'equal':94 'estim':157 'exampl':205 'exchang':152 'export':137 'feed':151 'financ':11,28,148 'found':209 'four':128 'gas':156 'gate':3,20,44 'generat':164 'generic':193 'geocod':161 'header':117 'howev':174 'infrastructur':159 'insight':138 'key':104 'learn':141 'limit':107 'list':69,166 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':140 'map':182 'marketplac':42 'maximum':83 'may':190 'metric':134 'micropay':55 'name':187 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':200 'page':219 'pay-per-request API' 'payload':207 'payment':116,122 'per':53,96 'per-request':52 'per-request-micropayment' 'platform':5,22,126 'post':76 'post-endpoint' 'premium':71 'price':150,173,216 'prompt':226 'proof':123 'protocol':40 'quot':155 'rate':106,153 'readm':218 'report':135 'request':54,77,97 'request/response':206 'requir':109 'resourc':198 'return':221 'schema':201 'sentiment':142 'settl':56 'share':168 'simpli':111 'specif':64,176 'substant':229 'summar':145 'text':144 'token':154 'unit':89 'usdc':58,91,98 'usdc-base' 'use':99 'util':13,30,160 'valid':120,162 'varieti':48 'wallet':225 'web3':149 'x':115 'x-payment':114 'x402':2,19,39,79,121 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"3de2c9cb-66ef-4e6d-8e32-ada1a51d57c0","listingId":"96ab0b99-d76b-40a7-a801-529f35fd37c9","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:43.671Z"}],"sources":[{"listingId":"96ab0b99-d76b-40a7-a801-529f35fd37c9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:43.671Z","lastSeenAt":"2026-04-23T04:31:07.954Z"}],"details":{"listingId":"96ab0b99-d76b-40a7-a801-529f35fd37c9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/59 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/59"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/59"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API resources without managing API keys or subscriptions","Agent-driven workflows that need on-demand, pay-per-call data or utility endpoints","Integrating micropayment-gated services into Web3 applications on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Developers not set up for USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.503Z"},"updatedAt":"2026-04-23T04:31:07.954Z"}}