{"id":"2d8f39b2-4e42-486a-a9e5-a7d93df1d5ea","shortId":"PSde5Q","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-call using the x402 protocol, settling in USDC on the Base network. The specific endpoint at `/api/v1/cards/80` is listed as \"Premium API Access\" and accepts POST requests with payment via USDC (contract 0x8335…2913 on Base).\n\nThe platform advertises a flat $0.02 per request across its catalog, with no API keys, no rate limits, and no minimum commitments required. The x402 challenge captured for this endpoint shows a `maxAmountRequired` of 20000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's stated pricing. Categories of endpoints available on the platform include metrics/reports/export/insights (data & analytics), sentiment analysis/summarization/classification/embeddings (AI & ML), price feeds/exchange rates/token quotes/gas estimates (finance & Web3), and geocoding/validation/conversion/generation (infrastructure utilities).\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 detailed documentation for any endpoint, including this one. The actual functionality behind `/api/v1/cards/80` is unclear from the available material; the description \"Premium API Access\" is generic and does not specify what data or service is returned.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific purpose of /api/v1/cards/80 ('Premium API Access') is not explained anywhere","Cannot verify what data or service this endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/80","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/80","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 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of `/api/v1/cards/80` specifically is entirely unclear. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/api/v1/cards/80':80,221 '/docs':182 '/pricing':184 '/readme':186 '/request':17,34 '0.02':16,33,105,143 '0x8335':96 '20000':134 '2913':97 '402 payment api' '6':139 'accept':88 'access':86,232 'across':49,108 'actual':218 'advertis':102 'ai':10,27,164 'ai/ml':52 'analysis/summarization/classification/embeddings':163 'analyt':51,161 'api':4,21,41,85,113,231 'avail':154,226 'base':7,24,74,99,135 'base network api' 'base-network' 'behind':220 'call':64 'captur':126 'catalog':110 'categori':151 'challeng':125 'commit':121 'connect':192 'consist':144 'content':198 'contract':95 'data':9,26,50,160,240 'decim':140 'descript':229 'detail':209 'document':177,210 'enabl':40 'endpoint':14,31,48,59,78,129,153,213 'equal':142 'estim':170 'exampl':206 'expos':44 'extrem':179 'feeds/exchange':167 'financ':11,28,171 'finance/web3':54 'flat':104 'function':219 'generic':234 'geocoding/validation/conversion/generation':174 'includ':158,214 'infer':53 'infrastructur':56,175 'key':114 'limit':117 'list':82 'low payment fee' 'lowpaymentfee.com':35 'marketplac':42 'materi':227 'maxamountrequir':132 'metrics/reports/export/insights':159 'micropayment api' 'minimum':120 'ml':165 'network':75 'no-api-key' 'offer':8,25 'one':216 'openapi':202 'page':187 'pay':62 'pay per call api' 'pay-per-cal':61 'pay-per-request' 'payabl':3,20 'payment':92 'per':63,106 'platform':5,22,101,157 'post':89 'post-endpoint' 'premium':84,230 'price':150,166 'prompt':194 'protocol':68 'quotes/gas':169 'rate':116 'rates/token':168 'render':189 'request':90,107 'request/response':205 'requir':122 'return':244 'schema':203 'sentiment':162 'servic':242 'settl':69 'show':130 'site':147 'spars':180 'specif':77 'specifi':238 'state':149 'unclear':223 'unit':136 'usdc':71,94,138 'usdc api' 'usdc-settlement' 'use':65 'util':13,30,57,176 'varieti':46 'via':93 'wallet':193 'web3':172 'x402':2,19,39,67,124 'x402 api' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"3931980c-fffc-477a-b7bd-581ba6db6260","listingId":"2d8f39b2-4e42-486a-a9e5-a7d93df1d5ea","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:54.544Z"}],"sources":[{"listingId":"2d8f39b2-4e42-486a-a9e5-a7d93df1d5ea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:54.544Z","lastSeenAt":"2026-04-22T10:01:40.931Z"}],"details":{"listingId":"2d8f39b2-4e42-486a-a9e5-a7d93df1d5ea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/80 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/80"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/80"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to various API services with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment protocol integrations"],"bestFor":["Developers wanting no-signup, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up","Anyone requiring fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.898Z"},"updatedAt":"2026-04-22T10:01:40.931Z"}}