{"id":"b354d1df-d8db-424a-ac26-fd5146d260d2","shortId":"NUSQDC","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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/accounts/200` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All endpoints use the x402 payment protocol with the \"exact\" scheme, settling in USDC (contract `0x8335…2913`) on Base.\n\nDocumentation is extremely thin — 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 usage examples available from the crawled material. The x402 challenge for this specific endpoint confirms it is live and accepts POST requests with a max payment of 20,000 base units (i.e., $0.02 USDC at 6 decimals).","tags":[],"capabilities":["x402-payment","usdc-base-network","per-call-pricing","json-api","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/accounts/200 ('Premium API Access') is undocumented — unclear what it returns","No request body schema or response schema is documented anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/200","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/accounts/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The endpoint's actual functionality ('Premium API Access' at /api/v1/accounts/200) is entirely opaque — it is unclear what data it returns or what input it expects beyond POST with 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'/request':13,28 '0.02':12,27,59,218 '000':214 '0x8335':149 '20':213 '2913':150 '402 payment api' '6':221 'accept':205 'access':90 'advertis':98 'ai':109 'ai-inference' 'ai/ml':49 'analysi':113 'analyt':48,103 'api':5,20,37,71,89,159 'application/json':93 'avail':188 'base':8,23,67,152,215 'base network api' 'broad':42 'call':4,19 'catalog':43 'categori':101 'challeng':195 'classif':116 'classification' 'commit':79 'confirm':200 'connect':168 'content':174 'contract':148 'convers':132 'cost':58 'crawl':191 'data':47,52,102,106 'data-analytics' 'decim':222 'doc':158 'document':153,183 'embed':117 'embeddings' 'enabl':36 'endpoint':45,57,82,100,135,199 'estim':127 'everi':56 'exact':143 'exampl':187 'exchang':122 'export':107 'extrem':155 'feed':121 'financ':118 'finance-data' 'finance/web3':51 'four':99 'gas':126 'generat':133 'geocod':130 'geocoding' 'i.e':217 'infer':50 'infrastructur':54,129 'insight':108 'json-api' 'key':72 'learn':111 'limit':75 'list':86 'live':203 'low payment fee' 'lowpaymentfee.com':31 'machin':110 'materi':192 'max':210 'metric':104 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':178 'page':163 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'payment':139,211 'per':3,18,60 'per-call-pricing' 'platform':6,21,38,97 'post':95,206 'premium':88 'price':120,160 'prompt':170 'protocol':140 'quot':125 'rate':74,123 'readm':162 'render':165 'report':105 'request':61,207 'request/response':181 'return':92 'schema':182 'scheme':144 'sentiment':112 'sentiment-analysis' 'settl':145 'span':46 'spec':179 'specif':81,198 'summar':115 'text':114 'text-summarization' 'thin':156 'token':124 'unit':216 'upfront':78 'usag':186 'usdc':15,30,64,147,219 'usdc api' 'usdc-base-network' 'use':136 'util':55 'valid':131 'via':10,25,94 'wallet':169 'web3':119 'x402':11,26,35,138,194 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"222a7055-1d9d-4512-86b5-5335694ab0e4","listingId":"b354d1df-d8db-424a-ac26-fd5146d260d2","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/accounts/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:45.194Z"}],"sources":[{"listingId":"b354d1df-d8db-424a-ac26-fd5146d260d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/200","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:45.194Z","lastSeenAt":"2026-04-22T18:31:15.017Z"}],"details":{"listingId":"b354d1df-d8db-424a-ac26-fd5146d260d2","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/200\n# Returns 402 with x402 payment challenge.\n# After constructing a valid X-PAYMENT header with USDC payment proof:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/200 \\\n  -H \"X-PAYMENT: <signed-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/accounts/200 shows maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/200"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/200"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) on a pay-per-call basis without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running data analytics queries and exporting reports with per-request billing","Using utility services like geocoding, validation, and data conversion"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents that can settle x402 micropayments in USDC on Base","Projects needing quick access to diverse API endpoints without signup"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Teams requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.255Z"},"updatedAt":"2026-04-22T18:31:15.017Z"}}