{"id":"b425b9e2-b440-4ba6-9a56-39002bc70c14","shortId":"tXWd6Q","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 uses the x402 payment protocol, meaning callers attach a payment header to each request rather than managing API keys or subscriptions.\n\nThe specific endpoint at `/api/v1/customers/71` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme. The endpoint accepts POST requests and returns `application/json`.\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 data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual behavior, request schemas, and response formats for any of these endpoints are undocumented. Without request/response examples or OpenAPI specs, integrators will need to experiment to discover the expected input and output formats.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","post-method"],"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 OpenAPI or schema documentation available — all doc/pricing/README pages return only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/customers/71 is undocumented","No request or response examples are available anywhere in the crawled material","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/71","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/71","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no documentation of request/response schemas, and all doc pages are empty stubs. The purpose of the /api/v1/customers/71 endpoint specifically is unclear beyond the generic label 'Premium API Access'. This is effectively a stub 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'/request':13,32 '0.02':12,31,67,125,183 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '20':119 '402':114 '6':130 'Base network API' 'USDC micropayment API' 'accept':147 'access':110 'across':53 'actual':205 'address':139 'advertis':156 'ai/ml':56 'analysi':160 'analyt':55 'api':5,17,24,36,45,96,109 'application/json':152 'attach':86 'base':8,27,75,121,133 'behavior':206 'beyond':188 'broader':154 'call':4,23 'caller':85 'challeng':115 'classif':163 'connect':201 'convers':175 'crypto-paid API' 'data':54,177 'decim':131 'discov':231 'document':187 'embed':164 'empti':194 'enabl':44 'endpoint':52,63,102,146,157,216 'essenti':193 'estim':172 'exact':143 'exampl':221 'exchang':167 'expect':233 'experi':229 'feed':166 'finance/web3':58 'format':211,237 'gas':171 'generat':178 'geocod':173 'header':89 'howev':186 'infer':57 'infrastructur':60 'input':234 'integr':225 'json-api' 'key':18,37,97 'land':190 'list':106 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'manag':95 'mean':84 'need':227 'network':9,28,76 'no-api-key' 'offer':48 'openapi':223 'output':236 'page':191,198 'paid':70 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':82,88,135 'per':3,22,68 'platform':6,25,46,78,155 'point':185 'post':148 'post-method' 'premium':108 'price':65,165,184 'protocol':83 'quot':170 'rate':168 'rather':93 'request':69,92,116,149,207 'request/response':220 'requir':19,38 'respons':210 'return':112,151 'schema':208 'scheme':144 'sentiment':159 'settl':137 'show':200 'sinc':127 'spec':224 'specif':101 'sub':197 'sub-pag':196 'subscript':99 'summar':162 'text':161 'token':169 'undocu':218 'unit':122 'usd':126 'usdc':15,34,72,124,128 'usdc-base-network' 'use':79,129,141 'util':61 'valid':174 'varieti':50 'via':10,29 'wallet':202 'without':219 'x402':11,30,43,81 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"40a1147f-4d7a-49c0-9e96-26845db7023a","listingId":"b425b9e2-b440-4ba6-9a56-39002bc70c14","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:00.171Z"}],"sources":[{"listingId":"b425b9e2-b440-4ba6-9a56-39002bc70c14","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:00.171Z","lastSeenAt":"2026-04-25T00:31:54.992Z"}],"details":{"listingId":"b425b9e2-b440-4ba6-9a56-39002bc70c14","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/71 \\\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","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/customers/71"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/customers/71"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or analytics endpoints without managing API keys or subscriptions","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-use API access into autonomous agent workflows"],"bestFor":["Developers who want keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-friction API access at $0.02 per request"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.17Z"},"updatedAt":"2026-04-25T00:31:54.992Z"}}