{"id":"4529b5e9-7d1f-4a00-93a7-af424740b55a","shortId":"P4Mxst","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header with each request.\n\nThe specific endpoint at `/api/v1/accounts/53` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also hosts endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\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 any endpoint. The actual functionality behind `/api/v1/accounts/53` is unclear — the description is generic (\"Premium API Access\") and no schema beyond the x402 challenge is provided.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 API","micropayment API","USDC API","Base network API","pay-per-call","crypto API payments"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The specific functionality of /api/v1/accounts/53 ('Premium API Access') is unclear","No examples of expected request body or response format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/53","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The purpose of /api/v1/accounts/53 specifically is unknown beyond the generic label 'Premium API 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'/request':13,32 '0.02':12,31,67,135,167 '000':124 '0x8335':129 '20':123 '2913':130 '6':139 'Base network API' 'USDC API' 'accept':112 'access':110,220 'across':53 'actual':208 'advertis':118 'ai/ml':56 'also':143 'amount':121 'analysi':148 'analyt':55 'api':5,17,24,36,45,81,109,176,219 'attach':92 'base':8,27,75,125,132 'behind':210 'beyond':224 'call':4,23 'caller':90 'challeng':117,227 'classif':151 'commit':89 'connect':185 'content':191 'convers':159 'crypto API payments' 'data':54,161 'decim':140 'descript':215 'detail':202 'doc':175 'document':170,203 'embed':152 'enabl':44 'endpoint':52,63,102,145,206 'equal':134 'exampl':199 'exchang':155 'export':162 'extrem':172 'feed':154 'finance/web3':58 'function':209 'generic':217 'geocod':157 'given':136 'header':96 'host':144 'infer':57 'infrastructur':60 'json-response' 'key':18,37,82 'limit':85 'list':106 'low payment fee' 'lowpaymentfee.com':39 'max':120 'micropayment API' 'network':9,28,76 'no-api-key' 'offer':48 'openapi':195 'page':180 'paid':70 'pay':2,21 'pay-per-cal':1,20 'pay-per-call' 'pay-per-request' 'payment':95 'per':3,22,68 'platform':6,25,46,78,142 'point':169 'post':113 'post-endpoint' 'premium':108,218 'price':65,153,168,177 'prompt':187 'provid':229 'rate':84,156 'readm':179 'render':182 'request':69,99,114 'request/response':198 'requir':19,38,79 'schema':196,223 'sentiment':147 'simpli':91 'spars':173 'specif':101 'summar':150 'text':149 'unclear':213 'unit':126 'upfront':88 'usdc':15,34,72,128,137 'usdc-base-network' 'util':61 'valid':158 'varieti':50 'via':10,29 'wallet':186 'x402':11,30,43,94,116,226 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"6c63d1aa-04a8-4447-b3d1-98b733118382","listingId":"4529b5e9-7d1f-4a00-93a7-af424740b55a","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:48.066Z"}],"sources":[{"listingId":"4529b5e9-7d1f-4a00-93a7-af424740b55a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:48.066Z","lastSeenAt":"2026-04-24T20:02:17.364Z"}],"details":{"listingId":"4529b5e9-7d1f-4a00-93a7-af424740b55a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/53 \\\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":"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/53"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to analytics, AI, finance, or utility endpoints without subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to flat-rate plans","Anyone without a Base-network USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.931Z"},"updatedAt":"2026-04-24T20:02:17.364Z"}}