{"id":"bf2d7b7b-9a38-4028-9677-bcfc937ee985","shortId":"xEDYYC","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/payments/50` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform advertises the same $0.02 flat rate across all its endpoints, which include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export.\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 crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body the POST endpoint expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-api","no-api-key","no-rate-limit","analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","Base network API","low fee API","crypto payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected request body for /api/v1/payments/50 is undocumented","No response schema or example responses available","The broad catalog of endpoints (AI, analytics, finance, utils) is advertised but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/50","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/payments/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific '/payments/50' endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/payments/50':97 '/docs':173 '/pricing':174 '/readme':177 '/request':19,38 '0.02':18,37,128,141 '000':117 '0x8335':122 '20':116 '2913':123 '402':216 '6':133 'Base network API' 'USDC API' 'accept':105 'access':103 'across':144 'advertis':138 'ai':12,31 'ai-inference' 'ai/ml':57 'analysi':151 'analyt':11,30,56 'analytics' 'api':5,24,45,84,102 'avail':203 'base':8,27,77,118,125 'bodi':226 'broad':50 'broader':136 'call':4,23,130 'catalog':51 'challeng':110,217 'classif':154 'confirm':211 'connect':183 'content':189 'convers':164 'cost':114 'cover':10,29 'crawl':206 'crypto payment API' 'crypto-data' 'data':55,61,166 'decim':134 'document':168,198,220 'embed':155 'enabl':44 'endpoint':16,35,53,67,95,147,209,229 'equal':127 'estim':161 'exampl':202 'exchang':158 'expect':230 'export':167 'extrem':170 'feed':157 'financ':13,32 'finance-data' 'finance/crypto':59 'flat':142 'gas':160 'general':63 'geocod':162 'includ':149 'indic':111 'infer':58 'key':85 'limit':88 'list':99 'live':212 'low fee API' 'lowpaymentfee.com':39 'market':60 'materi':207 'maximum':113 'micropayment API' 'network':78 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':193 'page':178 'paid':69 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payload':234 'per':3,22,71,129 'per-request':70 'per-request-billing' 'platform':6,25,46,137 'post':106,228 'post-api' 'premium':101 'price':156 'prompt':185 'proper':215 'protocol':82 'rate':87,143,159 'render':180 'request':72,107,225 'request/response':196 'requir':92 'respons':233 'return':213,236 'schema':197 'sentiment':150 'servic':65 'span':54 'spars':171 'spec':194 'specif':94 'subscript':91 'summar':153 'text':152 'unclear':223 'unit':119 'usag':201 'usdc':9,28,74,121,131 'usdc-base' 'use':73,132 'util':15,34,64 'utility-services' 'valid':163 'via':79 'wallet':184 'without':219 'x402':43,81,109 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f2122530-b046-49f5-9079-5182f4dbf976","listingId":"bf2d7b7b-9a38-4028-9677-bcfc937ee985","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/payments/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:50.782Z"}],"sources":[{"listingId":"bf2d7b7b-9a38-4028-9677-bcfc937ee985","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:50.782Z","lastSeenAt":"2026-04-23T02:01:20.110Z"}],"details":{"listingId":"bf2d7b7b-9a38-4028-9677-bcfc937ee985","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/50 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/50"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/50"},{"claim":"All endpoints 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":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without managing API keys or subscriptions","Programmatic access to analytics, AI inference, or financial data with per-call USDC payments","Lightweight utility calls (geocoding, validation, conversion) paid via x402 on Base"],"bestFor":["Developers and agents who want zero-signup, pay-as-you-go API access","Use cases requiring very low per-call costs ($0.02) settled on-chain","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume production workloads that need SLAs, support, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.926Z"},"updatedAt":"2026-04-23T02:01:20.110Z"}}