{"id":"6c7b4a28-afec-405f-8f83-e6cf38de7eab","shortId":"PqncKH","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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 pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/customers/26` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation 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 spec, no request/response schema documentation, and no examples available. The purpose and behavior of the `/api/v1/customers/26` endpoint specifically is unclear — it could be a demo or placeholder resource.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api-platform","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","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 and response formats are unknown","The specific endpoint /api/v1/customers/26 has no description beyond 'Premium API Access' — its actual functionality is unclear","The platform lists many endpoints on its homepage but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/26","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/customers/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation for request/response schemas, no OpenAPI spec, and the specific endpoint's purpose ('customers/26') is unexplained. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/customers/26':94,216 '/docs':180 '/pricing':182 '/readme':184 '/request':13,28 '0.02':12,27,62,127,171 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':113 '300':139 '6':123 'Base network API' 'USDC micropayment API' 'access':100 'account':74 'across':45 'address':135 'advertis':109,145 'ai/ml':48 'analysi':149 'analyt':47 'api':5,20,37,72,99 'application/json':103 'asset':119 'attach':82 'avail':209 'base':8,23,69,115 'base-network' 'behavior':213 'broader':143 'call':4,19,129 'caller':80 'challeng':108 'classif':152 'connect':190 'content':196 'convers':164 'could':222 'crypto-paid API' 'data':46 'decim':124 'demo':225 'document':175,205 'embed':153 'enabl':36 'endpoint':44,55,92,146,217 'equat':125 'estim':161 'exampl':208 'exchang':156 'extrem':177 'feed':155 'finance/web3':50 'gas':160 'generat':166 'geocod':162 'header':86 'howev':174 'infer':49 'infrastructur':52 'json-api' 'key':73 'limit':77 'list':96 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':111 'network':9,24,70 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':200 'page':185 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':85,131 'per':3,18,59,128 'placehold':227 'platform':6,21,38,144 'point':173 'post':105 'premium':98 'price':154,172 'prompt':192 'purpos':211 'quot':159 'rate':76,157 'render':187 'request':60,89 'request/response':203 'requir':79 'resourc':228 'return':102 'schema':204 'second':140 'sent':133 'sentiment':148 'settl':64 'simpli':81 'spars':178 'spec':201 'specif':91,218 'summar':151 'text':150 'timeout':141 'token':158 'unclear':220 'unit':116 'usdc':15,30,66,118 'usdc-settlement' 'util':53 'valid':163 'varieti':42 'via':10,25,104 'wallet':191 'x402':11,26,35,84,107 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"40417f7a-368e-4762-b58d-a647ac52482d","listingId":"6c7b4a28-afec-405f-8f83-e6cf38de7eab","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/customers/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:53.154Z"}],"sources":[{"listingId":"6c7b4a28-afec-405f-8f83-e6cf38de7eab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:53.154Z","lastSeenAt":"2026-04-25T03:02:22.402Z"}],"details":{"listingId":"6c7b4a28-afec-405f-8f83-e6cf38de7eab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/26 \\\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 are 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, equating to $0.02","source_url":"https://lowpaymentfee.com/api/v1/customers/26"},{"claim":"Payment is sent to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/26"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or customer records via a single paid API call without needing an account or API key","Integrating pay-per-use API endpoints into agent workflows that settle payments on Base in USDC","Prototyping x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who need non-crypto payment methods","High-throughput use cases where per-request crypto settlement adds unacceptable latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.458Z"},"updatedAt":"2026-04-25T03:02:22.402Z"}}