{"id":"a5451910-6061-4044-91f7-92f2f7d5222b","shortId":"p6mA58","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint `/api/v1/products/3` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 the same $0.02/request price point and settle on Base via USDC to the same payTo address.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The `/api/v1/products/3` endpoint itself is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality it actually returns upon successful payment.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/products/3 ('Premium API Access') is completely undocumented — unclear what data it returns","No request body schema or response schema available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/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/products/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 402 challenge, but there is zero documentation on what the endpoint actually returns, no OpenAPI spec, no request/response examples, and all doc pages are empty. The listing is effectively a stub with confirmed 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'/api/v1/products/3':64,217 '/call':19,38 '/docs':182 '/pricing':183 '/readme':186 '/request':163 '0.02':18,37,83,162 '000':78 '20':77 '402':225 '402 payment api' '6':88 'access':69 'across':119 'actual':238 'address':176 'advertis':99 'ai':12,31,129 'analysi':133 'analyt':123 'api':5,24,48,68,93 'attach':102 'avail':212 'base':8,27,57,79,169 'base usdc api' 'base-network' 'broader':115 'call':91 'caller':100 'categori':121 'challeng':226 'classif':136 'collect':42 'connect':192 'content':198 'convers':153 'crawl':215 'data':11,30,122,126,234 'decim':89 'document':177,207,229 'embed':137 'endpoint':16,35,49,63,118,156,218 'estim':147 'exampl':211 'exchang':142 'export':127 'extrem':179 'feed':141 'financ':13,32,138 'four':120 'function':236 'gas':146 'generat':154 'geocod':151 'header':107 'host':40 'infrastructur':149 'insight':128 'json-response' 'key':94 'label':66 'learn':131 'limit':97 'list':158 'live':221 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':130 'metric':124 'micropayment api' 'network':58 'no-api-key' 'offer':117 'openapi':202 'page':187 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payment':73,106,112,242 'payto':175 'per':3,22,46,90 'platform':116 'point':165 'post-method' 'premium':67 'price':140,164 'prompt':194 'proof':113 'proper':224 'protocol':54 'quot':145 'rate':96,143 'render':189 'report':125 'request':4,23,47 'request/response':205 'requir':71 'return':222,239 'schema':206 'sentiment':132 'settl':50,167 'simpli':101 'sinc':85 'spars':180 'spec':203 'specif':62 'success':241 'suit':6,25 'summar':135 'text':134 'token':144 'unclear':232 'unit':80 'upon':240 'usag':210 'usd':84 'usdc':60,82,86,171 'usdc-settlement' 'use':59,87 'util':15,34,150 'valid':110,152 'via':9,28,51,170 'wallet':193 'web3':139 'without':228 'x':105 'x-payment':104 'x402':10,29,53,111 'x402 api' 'x402-payment'","prices":[{"id":"723bb5ae-400a-4332-89b6-0e21f0231621","listingId":"a5451910-6061-4044-91f7-92f2f7d5222b","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/products/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":"2026-04-18T18:37:51.820Z"}],"sources":[{"listingId":"a5451910-6061-4044-91f7-92f2f7d5222b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:51.820Z","lastSeenAt":"2026-04-22T12:03:14.414Z"}],"details":{"listingId":"a5451910-6061-4044-91f7-92f2f7d5222b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/3 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/3"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","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"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/3"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need keyless, pay-as-you-go API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume production workloads requiring SLAs or guaranteed uptime","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.724Z"},"updatedAt":"2026-04-22T12:03:14.414Z"}}