{"id":"2fd6ad30-dd9d-4ef7-86a9-8a4408dcb7af","shortId":"Y5udYc","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/customers/82` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable. Other endpoints on the platform cover 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.\n\nDocumentation beyond the landing page is extremely thin: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and response format of `/api/v1/customers/82` is unknown beyond the MIME type declared in the x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific endpoint '/api/v1/customers/82' has a generic 'Premium API Access' description with no detail on what data it returns","Cannot verify what actual service this endpoint provides beyond the MIME type application/json"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/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/customers/82","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The purpose of '/api/v1/customers/82' specifically is opaque. This is effectively a stub 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'/api/v1/customers/82':117,243 '/docs':201 '/pricing':202 '/readme':205 '/request':19,38 '0.02':18,37,70,146,189 '000':135 '0x8335':140 '20':134 '2913':141 '402 payment required' '6':150 'accept':154 'access':123 'actual':237 'addit':216 'advertis':130 'ai':12,31,57 'analysi':167 'analyt':56 'api':5,24,45,88,122 'application/json':126 'attach':99 'avail':232 'base':8,27,78,136,143 'base network api' 'behavior':238 'beyond':193,246 'broad':50 'call':4,23 'caller':97 'catalog':51 'challeng':129,254 'classif':170 'commit':96 'connect':211 'convers':182 'cover':10,29,165 'crawl':235 'data':11,30,55 'decim':151 'declar':250 'detail':218 'discover':159 'document':192,227 'embed':171 'enabl':44 'endpoint':16,35,53,66,115,153,161 'equal':145 'estim':179 'everi':65 'exampl':231 'exchang':174 'extrem':198 'feed':173 'financ':13,32,60 'format':241 'gas':178 'generat':184 'geocod':180 'given':147 'header':104 'infrastructur':63 'json-api' 'key':89 'land':195 'learn':59 'limit':92 'list':119 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'maxamountrequir':132 'micropayment api' 'mime':248 'minimum':95 'network':79 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':222 'page':196,206 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':83,103,108 'per':3,22,71 'platform':6,25,46,164 'point':191 'post':155 'post-method' 'premium':121 'price':68,172,190 'prompt':213 'proof':109 'protocol':84 'quot':177 'rate':91,175 'render':208 'request':72,112,156 'request/response':225 'respons':240 'return':125 'schema':226 'sentiment':166 'settl':73 'simpli':98 'span':54 'spec':223 'specif':114 'summar':169 'technic':217 'text':168 'thin':199 'token':176 'type':249 'unit':137 'unknown':245 'usag':230 'usdc':9,28,75,139,148 'usdc api' 'usdc-base' 'util':15,34,64 'valid':107,181 'via':80 'wallet':212 'web3':61 'x':102 'x-payment':101 'x402':43,82,128,253 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"599e5787-922d-43df-a0e0-2035ea2fe7fa","listingId":"2fd6ad30-dd9d-4ef7-86a9-8a4408dcb7af","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/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":"2026-04-18T18:32:19.571Z"}],"sources":[{"listingId":"2fd6ad30-dd9d-4ef7-86a9-8a4408dcb7af","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:19.571Z","lastSeenAt":"2026-04-25T07:31:51.583Z"}],"details":{"listingId":"2fd6ad30-dd9d-4ef7-86a9-8a4408dcb7af","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/82 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/82"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/82"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"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 POST request","Agent-driven workflows that need on-demand API calls without pre-registration","Programmatic access to various data, AI, and finance endpoints with crypto micropayments"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible clients settling in USDC on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Teams that require fiat payment rails (credit card, invoice)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.983Z"},"updatedAt":"2026-04-25T07:31:51.583Z"}}