{"id":"8ad9186a-6d0e-4bdc-96ac-71a1335c4ffd","shortId":"wqtBEP","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint at `/api/v1/products/82` 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 request (USDC uses 6 decimals). The broader platform advertises a uniform $0.02/request pricing across all its endpoints, covering categories like sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive 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 this particular endpoint expects or what response it returns. The \"Premium API Access\" label is generic and does not clarify the endpoint's actual function.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","post-endpoint","pay-per-use"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found; request body format and response structure are unknown","The endpoint name 'Premium API Access' is generic and does not describe what the endpoint actually does","Cannot verify what data or service this specific endpoint (/api/v1/products/82) provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/82","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/82","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 402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation, no request/response schema, and no examples. The endpoint name 'Premium API Access' is generic and uninformative. The docs pages are all empty wallet-connect 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'/api/v1/products/82':87 '/docs':158 '/pricing':160 '/readme':162 '/request':12,28,132 '0.02':11,27,118,131 '000':107 '0x8335':112 '20':106 '2913':113 '402':201 '6':123 'Base network API' 'USDC API' 'accept':95 'access':93,224 'across':47,134 'actual':235 'advertis':128 'ai/ml':50 'analysi':142 'analyt':49 'api':5,14,21,30,39,75,92,223 'avail':188 'base':8,24,67,108,115 'bodi':211 'broader':126 'call':4,20 'categori':139 'challeng':100,202 'clarifi':231 'commit':81 'confirm':196 'connect':168 'content':174 'cost':104 'cover':138 'crawl':191 'crypto-paid API' 'data':48 'decim':124 'document':153,183,205 'embed':145 'enabl':38 'endpoint':46,57,85,137,194,214,233 'equal':117 'estim':149 'exampl':187 'expect':215 'extrem':155 'feed':147 'finance/web3':52 'function':236 'gas':148 'generic':227 'geocod':150 'indic':101 'infer':51 'infrastructur':54 'key':15,31,76 'label':225 'like':140 'limit':78 'list':89 'live':197 'lowpaymentfee' 'lowpaymentfee.com':33 'marketplac':40 'materi':192 'maximum':103 'micropayment API' 'network':68 'no-api-key' 'offer':42 'openapi':178 'page':163 'paid':59 'particular':213 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-use' 'per':3,19,61,119 'per-request':60 'per-request-billing' 'platform':6,22,127 'post':96 'post-endpoint' 'premium':91,222 'price':133,146 'prompt':170 'proper':200 'protocol':72 'rate':77 'render':165 'request':62,97,120,210 'request/response':181 'requir':16,32,82 'respons':218 'return':198,220 'schema':182 'sentiment':141 'spars':156 'spec':179 'specif':84 'substant':173 'summar':144 'text':143 'unclear':208 'uniform':130 'unit':109 'upfront':80 'usag':186 'usdc':64,111,121 'usdc-base' 'use':63,122 'util':55 'varieti':44 'via':9,25,69 'wallet':169 'without':204 'x402':10,26,37,71,99 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"46d52c9d-4df3-4591-b030-c698edf97452","listingId":"8ad9186a-6d0e-4bdc-96ac-71a1335c4ffd","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:38.147Z"}],"sources":[{"listingId":"8ad9186a-6d0e-4bdc-96ac-71a1335c4ffd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:38.147Z","lastSeenAt":"2026-04-23T19:00:35.700Z"}],"details":{"listingId":"8ad9186a-6d0e-4bdc-96ac-71a1335c4ffd","quickStartSnippet":"# Requires an x402-compatible HTTP client that can handle the 402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/products/82 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/products/82"},{"claim":"Endpoint is live and returns HTTP 402 with x402Version 1 challenge","source_url":"https://lowpaymentfee.com/api/v1/products/82"}],"useCases":["Programmatic access to various API services without needing API key registration","Agent-driven workflows that pay per-call using USDC on Base","Accessing analytics, AI inference, finance data, or utility endpoints with minimal onboarding"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC payments on Base","Quick prototyping without rate limits or subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring predictable bulk pricing","Users without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:37:56.987Z"},"updatedAt":"2026-04-23T19:00:35.700Z"}}