{"id":"cc4423a2-e98c-4997-bc5b-61e8eb881250","shortId":"HEEH8b","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/inbox/124` 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-amount scheme. The endpoint accepts POST requests and returns `application/json`.\n\nNote that while the landing page advertises many endpoint categories (sentiment analysis, text summarization, embeddings, price feeds, geocoding, etc.), the crawled documentation is extremely thin — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" stub with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind `/api/v1/inbox/124` specifically is unclear from the available material; the name \"Premium API Access\" is generic and does not describe a concrete capability.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages are empty stubs ('Connect wallet' only)","The specific functionality of /api/v1/inbox/124 is undocumented — 'Premium API Access' is a generic label","No request body schema or response schema is documented anywhere","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/124","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/inbox/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/inbox/124 ('Premium API Access') is entirely opaque. Effectively a stub 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'/api/v1/inbox/124':109,220 '/pricing':187 '/readme':189 '/request':19,38 '0.02':18,37,69,130 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '20':124 '402':119 '6':135 'accept':154 'access':115,232 'actual':217 'address':144 'advertis':166 'ai':12,31 'ai/ml':56 'amount':150 'analysi':171 'analyt':55 'api':5,24,45,86,114,231 'application/json':159 'attach':97 'avail':215,226 'base':8,27,77,126,138 'base network api' 'behind':219 'call':4,23 'caller':95 'capabl':241 'categori':169 'challeng':120 'collect':50 'commit':94 'concret':240 'connect':195 'crawl':180 'data':11,30,54,59 'decim':136 'describ':238 'detail':201 'document':181,210 'embed':174 'enabl':44 'endpoint':16,35,52,65,107,153,168 'etc':178 'everi':64 'exact':149 'exact-amount':148 'exampl':214 'extrem':183 'feed':176 'financ':13,32 'finance/web3':58 'function':218 'general':61 'generic':234 'geocod':177 'header':101 'host':48 'infer':57 'json-api' 'key':87 'land':164 'limit':90 'list':111 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'mani':167 'materi':227 'micropayment api' 'name':229 'network':78 'note':160 'offer':10,29 'openapi':205 'page':165,190 'paid':72 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':100,140 'per':3,22,70 'platform':6,25,46 'post':155 'post-endpoint' 'premium':113,230 'price':67,175 'protocol':82 'rate':89 'request':71,104,121,156 'request/response':208 'resolv':192 'return':117,158 'schema':209 'scheme':151 'sentiment':170 'servic':63 'settl':142 'simpli':96 'sinc':132 'span':53 'spec':206 'specif':106,221 'stub':197 'summar':173 'text':172 'thin':184 'unclear':223 'unit':127 'upfront':93 'usag':213 'usd':131 'usdc':9,28,74,129,133 'usdc api' 'usdc-base' 'use':134,146 'util':15,34,62 'via':79 'wallet':196 'x402':43,81,99 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e2cf222c-7da4-40c0-a6e1-0366aab970dd","listingId":"cc4423a2-e98c-4997-bc5b-61e8eb881250","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/inbox/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.479Z"}],"sources":[{"listingId":"cc4423a2-e98c-4997-bc5b-61e8eb881250","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/124","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.479Z","lastSeenAt":"2026-04-22T13:32:22.389Z"}],"details":{"listingId":"cc4423a2-e98c-4997-bc5b-61e8eb881250","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/124 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":{},"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":"402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/124"},{"claim":"Platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to pay-per-call API services without API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents needing keyless, pay-as-you-go API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads requiring rate-limit guarantees or bulk pricing","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.873Z"},"updatedAt":"2026-04-22T13:32:22.389Z"}}