{"id":"28670d29-4f18-40fa-ae38-9ba5a114ccd7","shortId":"WnkNRE","kind":"x402","title":"Pay-per-request premium API collection on Base via x402, settled in USDC at $0.02/call.","tagline":"Pay-per-request premium API collection on Base via x402, settled in USDC at $0.02/call.","description":"lowpaymentfee.com hosts a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The endpoint `/api/v1/collections/3` is labeled \"Premium API Access\" and requires a per-call payment of up to $0.02 in USDC (USD Coin on Base, contract 0x8335…2913). No API keys, rate limits, or upfront commitments are needed — each request is individually settled on-chain.\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 listed endpoints share the same $0.02 per-request pricing. However, the specific endpoint being listed here (`/api/v1/collections/3`) is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme \"exact\" and a 300-second payment timeout. Documentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/collections/3 ('Premium API Access') is undocumented; it is unclear what data or service it provides","No OpenAPI spec or request/response schema is published","No usage examples or error handling documentation found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/3","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI spec, no request/response schemas, and no examples are available. The 'Premium API Access' label is completely opaque. The docs pages are empty beyond a wallet-connect 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'/call':17,34 '0.02':16,33,73,148 '0x8335':81 '2913':82 '300':196 '402':190 'Base network API' 'USDC micropayment API' 'access':45,62,167 'across':106 'addit':223 'advertis':104 'ai':116 'analysi':120 'analyt':110 'api':6,23,44,61,84,166,210 'avail':238 'base':9,26,53,79 'base-network' 'broader':102 'call':68 'categori':108 'chain':100 'challeng':188 'classif':123 'coin':77 'collect':7,24 'commit':90 'connect':218 'contract':80 'convers':140 'crawl':241 'crypto-paid endpoint' 'data':109,113,174 'describ':162 'detail':225 'doc':208 'document':171,200 'embed':124 'endpoint':56,105,144,156,180 'estim':134 'exact':193 'exampl':237 'exchang':129 'export':114 'extrem':205 'feed':128 'financ':125 'four':107 'function':176 'gas':133 'generat':141 'geocod':138 'host':36 'howev':153 'http':189 'individu':96 'infrastructur':136 'insight':115 'key':85 'label':59 'learn':118 'limit':87 'list':143,158 'live':182 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':117 'materi':242 'metric':111 'need':92 'network':54 'no-api-key' 'on-chain':98 'openapi':229 'page':213 'pay':2,19,41 'pay-per-call API' 'pay-per-request':1,18,40 'payment':49,69,198 'per':3,20,42,67,150 'per-cal':66 'per-request':149 'per-request-billing' 'platform':103 'post-method' 'premium':5,22,60,165 'premium API access' 'price':127,152,209 'prompt':220 'protocol':50 'quot':132 'rate':86,130 'readm':212 'render':215 'report':112 'request':4,21,43,94,151 'request/response':232 'requir':64 'return':178,184 'schema':233 'scheme':192 'second':197 'sentiment':119 'settl':12,29,97 'share':145 'site':203 'spars':206 'spec':230 'specif':155 'suit':38 'summar':122 'technic':224 'text':121 'timeout':199 'token':131 'upfront':89 'usag':236 'usd':76 'usdc':14,31,75 'usdc-settlement' 'util':137 'valid':139,186 'via':10,27,46 'wallet':219 'web3':126 'x402':11,28,48,187 'x402 API' 'x402-payment'","prices":[{"id":"aab5b65c-c3fe-472c-962e-286d8466af4b","listingId":"28670d29-4f18-40fa-ae38-9ba5a114ccd7","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T00:59:34.639Z"}],"sources":[{"listingId":"28670d29-4f18-40fa-ae38-9ba5a114ccd7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:59:34.639Z","lastSeenAt":"2026-04-22T02:31:45.876Z"}],"details":{"listingId":"28670d29-4f18-40fa-ae38-9ba5a114ccd7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/3 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/3"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/3"},{"claim":"All listed endpoints share $0.02 per-request pricing with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a bundled collection of API services with a single per-request crypto payment","Agent-driven workflows that need keyless, on-demand API access settled in USDC","Exploring x402 protocol integration for pay-as-you-go API consumption"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing keyless API access with per-call micropayments","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.913Z"},"updatedAt":"2026-04-22T02:31:45.876Z"}}