{"id":"e2a11e37-f72e-4728-bba9-c305f5ce1f44","shortId":"3btKy9","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 priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transactions/167` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 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 returns application/json. The platform also advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, 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 of what this particular endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality \"Premium API Access\" at `/api/v1/transactions/167` actually provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","post-method"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of /api/v1/transactions/167 ('Premium API Access') is completely undocumented","Cannot verify what data or functionality this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/167","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/transactions/167","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 x402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI spec, no request/response schemas, and all doc pages render only 'Connect wallet'. The listing title 'Premium API Access' is generic and 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'/api/v1/transactions/167':103,236 '/docs':179 '/pricing':180 '/readme':183 '/request':13,28 '0.02':12,27,59,130,171 '000':119 '0x8335':124 '20':118 '2913':125 '402':219 '6':134 'Base network API' 'USDC micropayment API' 'accept':138 'access':109,234 'across':45 'actual':213,237 'advertis':147 'ai/ml':48 'also':146 'analysi':152 'analyt':47 'api':5,20,37,71,108,233 'application/json':143 'attach':87 'base':8,23,67,120,127 'call':4,19 'caller':86 'challeng':114,220 'classif':155 'commit':78 'confirm':221 'connect':189 'content':195 'convers':163 'crypto-paid API' 'data':46,165,229 'decim':135 'document':174,204,224 'embed':156 'enabl':36 'endpoint':44,55,101,137,149,212,216 'equal':129 'exampl':207 'exchang':159 'export':166 'extrem':176 'feed':158 'finance/web3':50 'function':231 'geocod':161 'given':131 'handl':83 'header':90 'immedi':98 'infer':49 'infrastructur':52 'inlin':85 'json-api' 'key':72 'limit':75 'list':105 'live':218 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'network':9,24,68 'offer':40 'openapi':199 'page':184 'particular':211 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':62 'payment':84,89 'per':3,18,60 'platform':6,21,38,145 'point':173 'post':139 'post-method' 'premium':107,232 'price':57,157,172 'prompt':191 'protocol':82 'provid':238 'rate':74,160 'receiv':95 'render':186 'request':61,93,115,140 'request/response':202 'requir':79 'respons':97 'return':111,142,214 'schema':203 'sentiment':151 'sibl':148 'spars':177 'spec':200 'specif':100 'summar':154 'text':153 'unclear':227 'unit':121 'usdc':15,30,64,123,132 'usdc-base-network' 'util':53 'valid':162 'varieti':42 'via':10,25 'wallet':190 'without':223 'x402':11,26,35,81,113 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"3f3ed826-6b0c-403f-99d0-19fbaffdbc8c","listingId":"e2a11e37-f72e-4728-bba9-c305f5ce1f44","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/transactions/167","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:55.194Z"}],"sources":[{"listingId":"e2a11e37-f72e-4728-bba9-c305f5ce1f44","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/167","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:55.194Z","lastSeenAt":"2026-04-22T07:01:33.471Z"}],"details":{"listingId":"e2a11e37-f72e-4728-bba9-c305f5ce1f44","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/167 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/167"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to various utility and data endpoints"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.723Z"},"updatedAt":"2026-04-22T07:01:33.471Z"}}