{"id":"435da5ca-d0e2-445a-b61e-08800ba7fe94","shortId":"3NDtd9","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 specific endpoint at `/api/v1/ach/93` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).\n\nThe broader 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 listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific functionality behind `/api/v1/ach/93` is unclear — the path suggests an ACH (Automated Clearing House) related resource, but this endpoint does not appear in the site's publicly listed API catalog. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual behavior of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","ACH API"],"warnings":["The endpoint path /api/v1/ach/93 does not appear in the site's publicly listed API catalog — its actual functionality is unknown.","No OpenAPI schema, request body schema, or response examples are available.","All documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no content.","The 'ACH' path component may relate to regulated financial services (Automated Clearing House); verify compliance before use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/93","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific function of /api/v1/ach/93 is undocumented. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/docs':199 '/pricing':200 '/readme':201 '/request':17,34 '0.02':16,33,97,150 '000':93 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':84 '20':92 '6':101 'ACH API' 'Base network API' 'USDC API' 'accept':72 'access':44,70 'ach':177 'actual':222 'advertis':106 'ai':10,27,118 'amount':90 'analysi':122 'analyt':112 'api':4,21,40,69,110,155,195 'appear':188 'autom':178 'base':7,24,58,86,94 'base-network' 'behavior':223 'behind':50,169 'broader':104 'catalog':196 'categori':108 'chain':80 'classif':125 'clear':179 'commit':163 'connect':205 'content':211 'contract':83 'convers':142 'data':9,26,111,115 'decim':102 'detail':219 'document':197,220 'embed':126 'endpoint':14,31,49,62,146,185,226 'estim':136 'exampl':217 'exchang':131 'export':116 'feed':130 'financ':11,28,127 'four':107 'function':168 'gas':135 'gate':3,20,43 'generat':143 'geocod':140 'given':98 'hous':180 'howev':165 'i.e':96 'infrastructur':138 'insight':117 'key':156 'learn':120 'limit':159 'list':66,145,194 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':119 'marketplac':41 'maximum':89 'metric':113 'micropay':55 'micropayment API' 'minimum':162 'network':59 'no-api-key' 'offer':8,25 'on-chain':78 'openapi':214 'page':198 'path':174 'pay-per-request API' 'payment':75 'per':52,151 'per-request':51 'per-request-billing' 'platform':5,22,105 'post':73 'post-endpoint' 'premium':68 'price':129,148 'prompt':207 'protocol':39 'public':193 'quot':134 'rate':132,158 'relat':181 'remain':227 'report':114 'request':53,74,152 'request/response':216 'requir':164 'resourc':182 'return':202 'schema':215 'sentiment':121 'settl':77 'site':191 'specif':61,167 'substant':210 'suggest':175 'summar':124 'text':123 'token':133 'unclear':172 'unit':95 'unknown':228 'usdc':54,82,99 'usdc-micropayment' 'util':13,30,139 'valid':141 'varieti':47 'via':81 'wallet':206 'web3':128 'without':212 'x402':2,19,38 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"fcc47ed3-9483-4072-949e-ae8d8f651654","listingId":"435da5ca-d0e2-445a-b61e-08800ba7fe94","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:22.873Z"}],"sources":[{"listingId":"435da5ca-d0e2-445a-b61e-08800ba7fe94","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:22.873Z","lastSeenAt":"2026-04-27T11:03:51.803Z"}],"details":{"listingId":"435da5ca-d0e2-445a-b61e-08800ba7fe94","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/93 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/93"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/93"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Integrating on-chain micropayment-gated services into agent workflows","Accessing utility or financial endpoints with instant USDC settlement 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 low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request on-chain settlement overhead matters","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.474Z"},"updatedAt":"2026-04-27T11:03:51.803Z"}}