{"id":"c709598f-8703-4132-87e9-0838bb1f7d49","shortId":"gTDgNU","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The platform advertises 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.\n\nThe specific endpoint at `/api/v1/ach/153` is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is settled on-chain to the provider's wallet. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/ach/153` endpoint actually returns. The endpoint path suggests ACH (Automated Clearing House) or payment-related functionality, but this is speculative. Without documentation or example payloads, agents must discover behavior empirically after payment.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","ACH API","premium API access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats","The purpose of /api/v1/ach/153 is unclear — 'Premium API Access' is a generic label","No examples of successful responses exist in the crawl material","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/153","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/153","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/ach/153 actually does. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34 '0.02':16,33,106,140 '000':129 '0x8335':134 '20':128 '2913':135 '6':138 'ACH API' 'Base network API' 'USDC API' 'access':45,118,165 'ach':224 'actual':218 'advertis':63,156 'agent':242 'ai':10,27,75 'ai-inference' 'analysi':79 'analyt':69 'api':4,21,41,67,117,158,186 'attach':168 'autom':225 'base':7,24,59,130,137 'base-network' 'behavior':245 'behind':51 'call':142 'caller':166 'categori':65 'chain':148 'challeng':124 'classif':82 'clear':226 'connect':195 'content':201 'convers':99 'data':9,26,68,72 'data-analytics' 'decim':139 'descript':212 'discov':244 'doc':185 'document':180,238 'embed':83 'empir':246 'endpoint':14,31,50,102,111,217,221 'estim':93 'exampl':209,240 'exchang':88 'export':73 'extrem':182 'feed':87 'financ':11,28,84 'finance-data' 'four':64 'function':232 'gas':92 'gate':3,20,44 'generat':100 'geocod':97 'header':173 'hous':227 'infrastructur':95 'insight':74 'instant':164 'key':159 'label':115 'learn':77 'limit':162 'list':104 'live':122 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':76 'marketplac':42 'metric':70 'micropay':56 'micropayment API' 'must':243 'network':60 'no-api-key' 'offer':8,25 'on-chain':146 'openapi':205 'page':190 'path':222 'pay-per-request API' 'payload':241 'payment':143,172,178,230,248 'payment-rel':229 'per':53,107,141 'per-request':52 'per-request-billing' 'platform':5,22,62,155 'premium':116 'premium API access' 'price':86,187 'prompt':197 'proof':179 'protocol':40 'provid':151 'quot':91 'rate':89,161 'readm':189 'relat':231 'render':192 'report':71 'request':54,108,125 'request/response':208 'return':120,219 'schema':206 'sentiment':78 'settl':145 'simpli':167 'spars':183 'specif':110 'specul':236 'suggest':223 'summar':81 'text':80 'token':90 'unit':131 'usdc':55,133 'usdc-micropayment' 'util':13,30,96 'utility-services' 'valid':98,176 'varieti':48 'wallet':153,196 'web3':85 'without':237 'x':171 'x-payment':170 'x402':2,19,39,123,177 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"b66653b9-bdf8-48a4-b4f5-b621e39a0f31","listingId":"c709598f-8703-4132-87e9-0838bb1f7d49","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/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:57.300Z"}],"sources":[{"listingId":"c709598f-8703-4132-87e9-0838bb1f7d49","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/153","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:57.300Z","lastSeenAt":"2026-04-23T06:04:02.444Z"}],"details":{"listingId":"c709598f-8703-4132-87e9-0838bb1f7d49","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/153 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/153"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/ach/153"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reporting endpoints without API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) via micropayments","Fetching real-time financial data, exchange rates, and crypto gas estimates","Using utility services like geocoding, validation, and data conversion on a pay-per-call basis"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-as-you-go API access","Use cases requiring no rate limits and no upfront registration"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods","High-volume batch workloads where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.663Z"},"updatedAt":"2026-04-23T06:04:02.444Z"}}