{"id":"2c5707a4-0aaa-418d-9392-2c654a05fb4c","shortId":"kvBb9e","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/394` is labeled \"Premium API Access\" and accepts POST requests. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe site lists four categories of APIs: 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). However, the specific endpoint probed (`/api/v1/payments/394`) does not clearly map to any of these listed categories — it sits under a `/payments/` path not mentioned on the homepage.\n\nThe x402 challenge confirms the endpoint is live, accepting payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a max amount of 20,000 base units of USDC (6 decimals = $0.02). Payment settles on Base using the \"exact\" scheme with a 300-second timeout. No OpenAPI spec, detailed documentation, or example responses were found — the docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["The endpoint path /api/v1/payments/394 does not correspond to any API listed on the homepage — its actual functionality is unknown.","No documentation, OpenAPI spec, or example responses are available anywhere on the site.","All secondary pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content.","The actual behavior and output of this endpoint cannot be verified without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/394","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/payments/394","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 no OpenAPI spec, no documentation, no example requests or responses, and the specific endpoint path (/api/v1/payments/394) doesn't match any of the advertised API categories. The docs/pricing/API pages are all empty beyond a wallet connect 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'/payments':148 '/request':13,28 '0.02':12,27,72,181 '000':174 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '20':173 '300':192 '402 payment protocol' '6':179 'Base network API' 'USDC micropayment API' 'accept':46,64,163 'access':62,88 'across':75 'address':166 'advertis':69 'ai':103 'amount':171 'analysi':107 'analyt':97 'api':5,20,38,61,81,95,208 'base':8,23,51,175,185 'call':4,19 'categori':93,143 'challeng':157 'classif':110 'clear':136 'confirm':158 'connect':216 'content':222 'convers':126 'crypto API access' 'data':96,100 'decim':180 'detail':198 'doc':206 'document':199 'embed':111 'endpoint':55,78,131,160 'estim':121 'exact':188 'exampl':201 'exchang':116 'export':101 'feed':115 'financ':112 'flat':71 'found':204 'four':92 'gas':120 'generat':127 'geocod':124 'homepag':154 'howev':128 'infrastructur':123 'insight':102 'instant':87 'json-response' 'key':82 'label':59 'learn':105 'limit':85 'list':91,142 'live':162 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':104 'map':137 'max':170 'mention':151 'metric':98 'network':9,24,52 'no-api-key' 'openapi':196 'page':211 'path':149 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,164,182 'per':3,18,36,73 'platform':6,21,39,68 'post':65 'post-endpoint' 'premium':60 'price':114,207 'probe':132 'prompt':218 'protocol':44 'quot':119 'rate':84,117 'readm':210 'report':99 'request':37,66,74 'respons':202 'return':213 'scheme':189 'second':193 'sentiment':106 'settl':183 'sit':145 'site':90 'spec':197 'specif':54,130 'substant':221 'summar':109 'text':108 'timeout':194 'token':118 'unit':176 'usdc':15,30,47,178 'usdc-base-network' 'use':41,186 'valid':125 'via':10,25 'wallet':217 'web3':113 'x402':11,26,43,156 'x402 API' 'x402-payment'","prices":[{"id":"8f5b9360-10c0-4076-9e71-ee6e43969803","listingId":"2c5707a4-0aaa-418d-9392-2c654a05fb4c","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/payments/394","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:36.792Z"}],"sources":[{"listingId":"2c5707a4-0aaa-418d-9392-2c654a05fb4c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/394","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:36.792Z","lastSeenAt":"2026-04-23T11:03:35.317Z"}],"details":{"listingId":"2c5707a4-0aaa-418d-9392-2c654a05fb4c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/394 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/394"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/394"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid services via x402 protocol"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.557Z"},"updatedAt":"2026-04-23T11:03:35.317Z"}}