{"id":"68707927-d0c5-4ca5-8409-dbcce3592ab7","shortId":"EqyJE6","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base network via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/ach/17` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header.\n\nThe broader platform advertises multiple API 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 listed at the same $0.02/request price point.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no actual technical documentation, request/response schemas, or usage examples. The specific functionality behind the `/api/v1/ach/17` endpoint path is unclear — the \"ach\" segment might suggest ACH (Automated Clearing House) payment-related functionality, but this is not documented anywhere. Without schemas or examples, it is impossible to confirm what this endpoint actually returns or what input it expects beyond a POST request.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","infrastructure"],"synonyms":["pay per call API","x402 API","USDC API payment","micropayment API","Base network API","ACH API","low fee API"],"warnings":["Documentation pages (docs, API, pricing, README) all return only 'Connect wallet' with no actual content","No OpenAPI spec or request/response schema available","The specific functionality of /api/v1/ach/17 ('Premium API Access') is undocumented — the 'ach' path segment is unexplained","No examples of successful responses exist in the crawl material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/17","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/17","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 confirms pricing ($0.02 USDC on Base), but there is zero documentation for this specific endpoint. No request/response schema, no examples, and the docs pages are empty. The purpose of /api/v1/ach/17 is 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'/request':20,40,161 '0.02':19,39,77,92,160 '000':83 '20':82 '6':90 'ACH API' 'Base network API' 'USDC API payment' 'accept':56 'access':72 'ach':204,208 'actual':185,234 'advertis':116 'ai':13,33,127 'analysi':131 'analyt':121 'anywher':221 'api':5,25,48,71,94,118,171 'autom':209 'base':8,28,61,84 'behind':196 'beyond':241 'broader':114 'call':4,24,79 'categori':119 'classif':134 'clear':210 'confirm':230 'connect':180 'convers':151 'cost':74 'data':12,32,120,124 'decim':91 'doc':170 'document':165,187,220 'embed':135 'endpoint':17,37,65,154,199,233 'estim':145 'exampl':192,225 'exchang':140 'expect':240 'export':125 'extrem':167 'feed':139 'financ':14,34,136 'function':195,215 'gas':144 'generat':152 'geocod':149 'header':112 'hous':211 'howev':164 'imposs':228 'individu':106 'infrastructur':147 'input':238 'insight':126 'key':95 'learn':129 'limit':97 'list':68,156 'low fee API' 'lowpaymentfee.com':41 'machin':128 'maxamountrequir':80 'metric':122 'micropayment API' 'might':206 'multipl':117 'network':9,29,62 'no-api-key' 'page':175 'paid':105 'path':200 'pay':2,22,45 'pay per call API' 'pay-per-cal':1,21 'pay-per-request':44 'payment':58,111,213 'payment-rel':212 'per':3,23,46,78 'platform':6,26,49,115 'point':163 'post':243 'post-endpoint' 'premium':70 'price':138,162,172 'prompt':182 'protocol':54 'quot':143 'rate':96,141 'readm':174 'relat':214 'render':177 'report':123 'request':47,103,244 'request/response':188 'requir':101 'return':235 'schema':189,223 'segment':205 'sentiment':130 'spars':168 'specif':64,194 'subscript':99 'suggest':207 'summar':133 'technic':186 'text':132 'token':142 'unclear':202 'unit':85 'usag':191 'usdc':57,87 'usdc-base-network' 'use':51 'util':16,36,148 'valid':150 'via':10,30,107 'wallet':181 'web3':137 'without':222 'x':110 'x-payment':109 'x402':11,31,53 'x402 API' 'x402-payment'","prices":[{"id":"38863582-5880-45a6-9617-14b598f421c8","listingId":"68707927-d0c5-4ca5-8409-dbcce3592ab7","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:26.785Z"}],"sources":[{"listingId":"68707927-d0c5-4ca5-8409-dbcce3592ab7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:26.785Z","lastSeenAt":"2026-04-28T02:33:34.102Z"}],"details":{"listingId":"68707927-d0c5-4ca5-8409-dbcce3592ab7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/17 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/17"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/17"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without subscriptions or API keys","Integrating x402-compatible agents with pay-as-you-go endpoints","Accessing premium data or services via crypto micropayments on Base"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","x402-compatible AI agents that can settle payments on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Anyone needing detailed API documentation or guaranteed SLAs","Use cases requiring well-documented request/response schemas","High-volume consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.049Z"},"updatedAt":"2026-04-28T02:33:34.102Z"}}