{"id":"499eb139-48fe-48c4-a729-ecc643f21159","shortId":"2rmVp8","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 platform that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/accounts/183` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The payment challenge indicates a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\n\nThe broader platform advertises four categories of APIs: 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. The platform emphasizes no API keys, no rate limits, no minimums, and instant access — callers simply attach an x402 payment header to each request.\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 what the `/api/v1/accounts/183` endpoint actually returns. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the lack of documentation makes it difficult to know what data or functionality this specific accounts endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-platform","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","accounts API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for any endpoint","The purpose of /api/v1/accounts/183 ('Premium API Access') is completely undocumented — unclear what data it returns","No request body schema or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/183","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/accounts/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation, no request/response examples, and no explanation of what the /api/v1/accounts/183 endpoint actually returns. The docs pages are all empty wallet-connect prompts. This is effectively a stub 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'/api/v1/accounts/183':65,224 '/docs':192 '/pricing':194 '/readme':196 '/request':17,34,160 '0.02':16,33,103,159 '000':92 '0x8335':97 '20':91 '2913':98 '402':234 '6':109 'Base network API' 'USDC API access' 'accept':73 'access':45,71,176 'account':256 'accounts API' 'actual':226 'advertis':114 'ai':10,27,126 'amount':89 'analysi':130 'analyt':120 'api':4,21,41,70,118,167 'attach':179 'base':7,24,59,93,100 'base-network' 'behind':51 'broader':112 'caller':177 'categori':116 'challeng':85,239 'classif':133 'confirm':231 'connect':202 'content':208 'convers':150 'data':9,26,119,123,251 'decim':110 'detail':219 'difficult':247 'document':187,220,244 'embed':134 'emphas':165 'endpoint':14,31,50,63,153,225,229,257 'equal':102 'estim':144 'exact':81 'exampl':216 'exchang':139 'export':124 'extrem':189 'feed':138 'financ':11,28,135 'four':115 'function':253 'gas':143 'gate':3,20,44 'generat':151 'geocod':148 'given':106 'header':183 'indic':86 'infrastructur':146 'insight':125 'instant':175 'json-response' 'key':168 'know':249 'lack':242 'learn':128 'limit':171 'list':67,155 'live':232 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':127 'make':245 'max':88 'metric':121 'micropay':56 'micropayment API' 'minimum':173 'network':60 'no-api-key' 'offer':8,25 'openapi':212 'page':197 'pay-per-request API' 'payment':77,84,182 'per':53,104 'per-request':52 'per-request-billing' 'platform':5,22,42,113,164 'point':162 'post':74 'post-endpoint' 'premium':69 'price':137,161 'prompt':204 'protocol':40 'provid':258 'quot':142 'rate':140,170 'render':199 'report':122 'request':54,75,105,186 'request/response':215 'return':227,233 'schema':213 'scheme':82 'sentiment':129 'simpli':178 'spars':190 'specif':62,255 'summar':132 'text':131 'token':141 'unit':94 'usdc':55,96,107 'usdc-micropayment' 'util':13,30,147 'valid':149,237 'varieti':48 'via':78 'wallet':203 'web3':136 'x402':2,19,39,80,181,238 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"ec41d9ab-64e9-4d2c-aa50-6cd711d28e16","listingId":"499eb139-48fe-48c4-a729-ecc643f21159","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/accounts/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:34.956Z"}],"sources":[{"listingId":"499eb139-48fe-48c4-a729-ecc643f21159","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/183","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:34.956Z","lastSeenAt":"2026-04-24T18:32:16.818Z"}],"details":{"listingId":"499eb139-48fe-48c4-a729-ecc643f21159","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/183 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/183"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/183"},{"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":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium account data via a single micropayment without API key registration","Agent-driven workflows that need on-demand API access with crypto payment","Programmatic access to gated resources using x402 protocol on Base"],"bestFor":["Developers or agents already set up with x402 payment on Base","Use cases requiring no-signup, pay-as-you-go API access","Low-volume or sporadic API consumers who want to avoid subscriptions"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.751Z"},"updatedAt":"2026-04-24T18:32:16.818Z"}}