{"id":"8d3c2178-a5cb-4ead-a455-ca38451b90ae","shortId":"yAvabh","kind":"x402","title":"x402-gated API platform offering data, AI, finance, and utility endpoints at $0.02/request on Base.","tagline":"x402-gated API platform offering data, AI, finance, and utility endpoints at $0.02/request on Base.","description":"lowpaymentfee.com is an x402-protocol API marketplace that exposes a broad catalog of endpoints across four 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 utilities (geocoding, validation, conversion, generation). All endpoints are pay-per-call at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/ach/63` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…0913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no upfront commitments are required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/ach/63` endpoint actually returns. The endpoint path suggests ACH (Automated Clearing House) or payment-related functionality, but this is speculative. Without documentation or example payloads, integrators will need to experiment to discover the actual behavior.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","no-rate-limit"],"categories":["api-marketplace","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment required API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The purpose of /api/v1/ach/63 ('Premium API Access') is unclear — the path suggests ACH/payment functionality but this is unconfirmed","No example request or response payloads are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/63","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/ach/63","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, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of /api/v1/ach/63 is unclear. The docs pages are empty beyond a wallet-connect prompt, making this effectively a stub 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'/request':15,32 '0.02':14,31,94,136 '000':125 '0913':131 '0x8335':130 '20':124 '402 payment required API' 'Base network API' 'USDC micropayment API' 'accept':159 'access':113 'ach':209 'across':50 'actual':203,235 'addit':185 'ai':8,25,60 'analysi':64 'analyt':54 'api':4,21,41,112,146,171 'application/json':164 'autom':210 'base':17,34,102,126,133 'base-network' 'behavior':236 'broad':46 'call':92 'catalog':47 'categori':52 'challeng':119 'classif':67 'clear':211 'commit':154 'connect':180 'content':186 'convers':84 'crypto-paid API' 'data':7,24,53,57 'descript':197 'discov':233 'doc':170 'document':165,223 'embed':68 'endpoint':12,29,49,87,106,158,202,206 'equal':135 'estim':78 'exact':143 'exampl':194,225 'exchang':73 'experi':231 'export':58 'expos':44 'extrem':167 'feed':72 'financ':9,26,69 'four':51 'function':217 'gas':77 'gate':3,20 'generat':85 'geocod':82 'hous':212 'infrastructur':80 'insight':59 'integr':227 'json-api' 'key':147 'learn':62 'limit':150 'list':109 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':61 'made':139 'marketplac':42 'maxamountrequir':122 'metric':55 'need':229 'network':103 'no-api-key' 'no-rate-limit' 'offer':6,23 'openapi':190 'page':175 'path':207 'pay':90 'pay-per-cal':89 'pay-per-call API' 'pay-per-request' 'payload':226 'payment':137,215 'payment-rel':214 'per':91,95 'platform':5,22 'post':160 'premium':111 'price':71,172 'prompt':182 'protocol':40 'quot':76 'rate':74,149 'readm':174 'relat':216 'render':177 'report':56 'request':96,161 'request/response':193 'requir':156 'return':115,163,204 'schema':191 'scheme':144 'sentiment':63 'settl':97 'spars':168 'specif':105 'specul':221 'suggest':208 'summar':66 'text':65 'token':75 'unit':127 'upfront':153 'usdc':99,129 'usdc-settlement' 'util':11,28,81 'valid':83,117 'via':140 'wallet':181 'web3':70 'without':222 'x402':2,19,39,118,142 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"a5f80ba5-e56c-4cfe-a672-af7915858359","listingId":"8d3c2178-a5cb-4ead-a455-ca38451b90ae","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/ach/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:16.291Z"}],"sources":[{"listingId":"8d3c2178-a5cb-4ead-a455-ca38451b90ae","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:16.291Z","lastSeenAt":"2026-04-23T06:04:03.622Z"}],"details":{"listingId":"8d3c2178-a5cb-4ead-a455-ca38451b90ae","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/63 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/ach/63 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/63"},{"claim":"The endpoint accepts POST requests and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/ach/63"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-call API endpoints without API key management","Making micropayment-gated requests for data, AI inference, or utility services","Integrating x402-compatible agents with on-chain USDC payments on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing simple USDC-based micropayment API integration"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may be inefficient","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.829Z"},"updatedAt":"2026-04-23T06:04:03.622Z"}}