{"id":"280c99c1-c913-459f-bb16-44c225f851f9","shortId":"Swgkak","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 set 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. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header.\n\nThe specific endpoint `/api/v1/ach/169` is listed as \"Premium API Access\" but its exact functionality is not documented on the site. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 this particular endpoint returns. The site's landing page lists many endpoints but provides no detail beyond names and prices. Prospective users should be aware that the actual behavior of `/api/v1/ach/169` is unknown and would need to be discovered by making a paid call.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post","no-api-key","no-rate-limit"],"categories":["api-marketplace","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto-paid API"],"warnings":["The specific endpoint /api/v1/ach/169 has no documentation — its purpose, expected input, and output are completely unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content.","No OpenAPI schema or request/response examples are available anywhere on the site.","The 'ach/169' path suggests ACH (Automated Clearing House) banking functionality, which could involve regulated financial services — exercise caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/169","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/v1/ach/169 actually does, no request/response schema, no examples, and all doc pages are empty. The listing is effectively a 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'/request':15,32 '0.02':14,31,94,166 '000':156 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':177 '0x8335':161 '20':155 '300':180 '402 payment API' '6':169 'Base network API' 'USDC micropayment API' 'accept':148 'access':130 'across':50 'actual':245 'addit':203 'address':176 'ai':8,25,60 'analysi':64 'analyt':54 'api':4,21,41,105,129,189 'attach':116 'awar':242 'base':17,34,102,157,163 'base-network' 'behavior':246 'beyond':234 'broad':46 'call':92,261 'caller':114 'categori':52 'challeng':143 'classif':67 'commit':111 'confirm':144 'connect':198 'content':204 'convers':84 'crypto-paid API' 'data':7,24,53,57 'decim':170 'descript':215 'detail':233 'discov':256 'doc':188 'document':137,183 'embed':68 'endpoint':12,29,49,87,123,220,229 'equal':165 'estim':78 'exact':133 'exampl':212 'exchang':73 'export':58 'expos':44 'extrem':185 'feed':72 'financ':9,26,69 'four':51 'function':134 'gas':77 'gate':3,20 'generat':85 'geocod':82 'header':120 'http-post' 'infrastructur':80 'insight':59 'key':106 'land':225 'learn':62 'limit':108 'list':126,227 'live':147 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':61 'make':258 'mani':228 'marketplac':42 'metric':55 'name':235 'need':253 'network':103 'no-api-key' 'no-rate-limit' 'offer':6,23 'openapi':208 'page':193,226 'paid':260 'particular':219 'pay':90 'pay-per-cal':89 'pay-per-call API' 'pay-per-request' 'payment':119,172 'per':91,95 'platform':5,22 'post':149 'premium':128 'price':71,190,237 'prompt':200 'prospect':238 'protocol':40 'provid':231 'quot':76 'rate':74,107 'readm':192 'render':195 'report':56 'request':96,150 'request/response':211 'requir':113,152 'return':221 'schema':209 'second':181 'sentiment':63 'set':47 'settl':97,174 'simpli':115 'site':140,223 'spars':186 'specif':122 'summar':66 'text':65 'timeout':182 'token':75 'unit':158 'unknown':250 'upfront':110 'usdc':99,160,167 'usdc-settlement' 'use':168 'user':239 'util':11,28,81 'valid':83 'wallet':199 'web3':70 'would':252 'x402':2,19,39,118,142 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"6197eed2-9e79-4829-846a-162f8db4cb79","listingId":"280c99c1-c913-459f-bb16-44c225f851f9","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:06.398Z"}],"sources":[{"listingId":"280c99c1-c913-459f-bb16-44c225f851f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/169","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:06.398Z","lastSeenAt":"2026-04-23T06:04:03.142Z"}],"details":{"listingId":"280c99c1-c913-459f-bb16-44c225f851f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/169 \\\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 are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is settled in USDC on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms endpoint is live with maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/ach/169"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility services"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-volume or exploratory API usage where subscriptions are overkill"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","High-volume production workloads requiring bulk pricing or rate guarantees","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.296Z"},"updatedAt":"2026-04-23T06:04:03.142Z"}}