{"id":"d59d2fbc-619e-4d80-9492-0763963a77bd","shortId":"EpbRJh","kind":"x402","title":"Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/collections/27` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC (USD Coin) on Base. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader platform offers 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe `/api/v1/collections/27` endpoint itself lacks detailed documentation — the docs, pricing, and API 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 \"Premium API Access\" actually returns. It may be a bundled or meta-endpoint covering the collection, but this is unconfirmed.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet' with no content","No OpenAPI or request/response schema provided for this endpoint","The purpose and output of '/api/v1/collections/27' ('Premium API Access') is undefined — it is unclear what data or functionality it provides","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/27","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/collections/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' actually returns. The docs/pricing/API pages are all blank beyond a wallet-connect 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'/call':12,30 '0.02':11,29,98,147 '000':89 '20':88 '6':94 'Base network API' 'USDC API' 'accept':69 'access':48,67,200 'across':106 'actual':201 'advertis':83 'ai':116 'amount':86 'analysi':120 'analyt':110 'api':5,16,23,34,46,66,152,172,199 'base':8,26,56,79,90 'base-network' 'broader':102 'bundl':207 'categori':108 'challeng':82 'classif':123 'coin':77 'collect':6,24,40,214 'commit':160 'connect':178 'content':184 'convers':140 'cover':212 'data':109,113 'decim':95 'descript':195 'detail':166 'doc':169 'document':167 'embed':124 'endpoint':47,60,105,143,163,211 'equal':97 'estim':134 'exampl':192 'exchang':129 'export':114 'feed':128 'financ':125 'four':107 'gas':133 'generat':141 'geocod':138 'host':38 'infrastructur':136 'insight':115 'key':17,35,153 'label':64 'lack':165 'learn':118 'limit':156 'list':145 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':117 'maximum':85 'may':204 'meta':210 'meta-endpoint':209 'metric':111 'micropayment API' 'minimum':159 'network':57 'no-api-key' 'offer':104 'openapi':188 'page':173 'pay':2,20,43 'pay-per-call API' 'pay-per-request':1,19,42 'payment':52,73 'per':3,21,44,99,148 'platform':103 'post':70 'post-endpoint' 'premium':65,198 'price':127,170 'prompt':180 'protocol':53 'quot':132 'rate':130,155 'render':175 'report':112 'request':4,22,45,71,100,149 'request/response':191 'requir':18,36 'return':202 'schema':189 'sentiment':119 'settl':72 'specif':59 'summar':122 'text':121 'token':131 'unconfirm':218 'unit':91 'usd':76 'usdc':14,32,75,93 'usdc-settlement' 'util':137 'valid':139 'via':9,27,49 'wallet':179 'web3':126 'x402':10,28,51,81 'x402 API' 'x402-payment'","prices":[{"id":"6d8d9f95-5356-47a1-a20d-3de4c68558e2","listingId":"d59d2fbc-619e-4d80-9492-0763963a77bd","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/collections/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T23:59:54.156Z"}],"sources":[{"listingId":"d59d2fbc-619e-4d80-9492-0763963a77bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T23:59:54.156Z","lastSeenAt":"2026-04-22T09:01:57.554Z"}],"details":{"listingId":"d59d2fbc-619e-4d80-9492-0763963a77bd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/27 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/27"},{"claim":"All endpoints are priced 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 endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/27"}],"useCases":["Programmatic access to a suite of data, AI, finance, and utility APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Prototyping integrations where per-request billing avoids upfront commitment"],"bestFor":["Developers or agents who want zero-friction, keyless API access","Use cases requiring small, infrequent API calls without subscription overhead","x402-compatible agents that can settle USDC payments on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.084Z"},"updatedAt":"2026-04-22T09:01:57.554Z"}}