{"id":"aff60221-edbb-4c35-87da-0ff72cc3483c","shortId":"DghRcW","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 pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/87` is listed as \"Premium API Access\" and advertises a max cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for 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. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The actual functionality behind this specific `/transactions/87` endpoint is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No OpenAPI spec or schema documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content","The specific purpose of /api/v1/transactions/87 ('Premium API Access') is not documented — unclear what data or service it provides","No request body schema or response examples are available from any crawled source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/87","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of the /transactions/87 endpoint is undefined. This is effectively a stub 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'/request':13,28 '/transactions/87':231 '0.02':12,27,62,119,180 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x8335':113 '20':107 '2913':114 '300':148 '6':123 'Base network API' 'USDC API' 'accept':133 'access':100 'across':45 'actual':226 'address':144 'advertis':102,154 'ai/ml':48 'analysi':158 'analyt':47 'api':5,20,37,72,99,190 'application/json':138 'attach':82 'avail':220,237 'base':8,23,69,109,116 'base-network' 'behind':228 'broader':152 'call':4,19 'caller':80 'challeng':127 'classif':161 'confirm':128 'connect':199 'content':224 'convers':173 'cost':105 'crawl':223 'crypto-paid API' 'data':46 'decim':124 'detail':206 'doc':189 'document':184,215 'embed':162 'enabl':36 'endpoint':44,55,92,130,155,232 'equal':118 'estim':170 'exampl':219 'exchang':165 'extrem':186 'feed':164 'finance/web3':50 'function':227 'gas':169 'generat':175 'geocod':171 'given':120 'header':86 'howev':183 'infer':49 'infrastructur':52 'json-response' 'key':73 'limit':75 'list':96 'live':132 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':238 'max':104 'micropayment API' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':210 'page':194 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':57 'payment':85,140 'per':3,18,59 'platform':6,21,38,153 'point':182 'post':134 'post-method' 'premium':98 'price':163,181,191 'prompt':201 'quot':168 'rate':74,166 'readm':193 'render':196 'request':60,89,135 'request/response':213 'requir':79 'return':137 'schema':214 'second':149 'sentiment':157 'settl':64,142 'simpli':81 'spars':187 'spec':211 'specif':91,230 'subscript':77 'summar':160 'technic':205 'text':159 'timeout':150 'token':167 'unclear':234 'unit':110 'usag':218 'usdc':15,30,66,112,121 'usdc-settlement' 'util':53 'valid':172 'varieti':42 'via':10,25 'wallet':200 'x402':11,26,35,84,126 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1037d16e-a742-4520-af5f-7cdb243fe88f","listingId":"aff60221-edbb-4c35-87da-0ff72cc3483c","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:13.073Z"}],"sources":[{"listingId":"aff60221-edbb-4c35-87da-0ff72cc3483c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:13.073Z","lastSeenAt":"2026-04-22T11:32:27.273Z"}],"details":{"listingId":"aff60221-edbb-4c35-87da-0ff72cc3483c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/87 \\\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, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/87"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-use API endpoints without subscription or API key management","Making programmatic API calls settled in USDC on Base via x402 protocol","Agent-driven workflows that need on-demand API access with crypto micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Projects already operating on the Base network with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Developers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.733Z"},"updatedAt":"2026-04-22T11:32:27.273Z"}}