{"id":"93e2e190-1760-46db-8445-85a33a8dfedc","shortId":"ucAMfu","kind":"x402","title":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","description":"This endpoint at `/api/v1/ach/187` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/187` path is not documented — the endpoint is labeled only as \"Premium API Access\" — so its exact purpose is unclear. It may relate to ACH (Automated Clearing House) payment processing or data, but this is speculative based solely on the URL path.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. The price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 `exact` scheme on Base to the specified wallet address. The platform advertises no API keys, no rate limits, and instant access — you pay per request with USDC and receive a JSON response.\n\nDocumentation is extremely sparse. The docs, pricing, API, 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 data or functionality this specific endpoint provides. Without knowing the expected request body or response format, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","lowpaymentfee","x402 API","USDC pay-per-call","Base network API","automated clearing house"],"warnings":["The specific function of /api/v1/ach/187 is completely undocumented — the endpoint purpose is unknown.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content.","No request or response schema is available; integration requires blind experimentation.","The endpoint path suggests ACH (financial) functionality, which may involve regulated activity."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/187","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/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. The 'ACH/187' path and 'Premium API Access' label are the only clues. No OpenAPI schema, no examples, and all doc pages are 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'/call':12,30 '0.02':11,29,153 '000':144 '20':143 '6':149 'ACH API' 'Base network API' 'USDC pay-per-call' 'accept':137 'access':99,182 'ach':5,23,110 'address':170 'advertis':173 'ai/ml':60 'analyt':59 'api':16,34,56,98,175,201 'autom':111 'automated clearing house' 'base':8,26,79,122,145,165 'base-network' 'bodi':241 'call':55 'challeng':130 'clear':112 'collect':50 'confirm':131 'connect':209 'contact':249 'content':215 'crypto':63 'data':58,117,229 'decim':150 'descript':226 'doc':199 'document':90,194 'endpoint':6,24,38,68,92,133,234 'equal':152 'exact':102,162 'exampl':223 'expect':239 'experiment':247 'extrem':196 'financ':62 'format':244 'function':83,231 'hous':113 'infer':61 'instant':181 'integr':245 'json':192 'json-response' 'key':17,35,176 'know':237 'label':94 'limit':179 'live':135 'lowpaymentfee' 'lowpaymentfee.com':45 'made':158 'may':107 'network':80 'no-api-key' 'offer':48 'openapi':219 'page':204 'part':42 'path':87,127 'pay':2,20,53,184 'pay-per-cal':52 'pay-per-request':1,19 'payment':72,114,156 'payment API' 'per':3,21,54,154,185 'platform':46,172 'post':138 'post-endpoint' 'premium':97 'price':141,200 'process':115 'prompt':211 'protocol':73 'provid':235,251 'purpos':103 'rate':178 'readm':203 'receiv':190 'relat':108 'render':206 'request':4,22,139,155,186,240 'request/response':222 'requir':18,36,246 'respons':193,243 'schema':220 'scheme':163 'servic':66 'settl':74 'sole':123 'span':57 'spars':197 'specif':82,233 'specifi':168 'specul':121 'unclear':105 'unit':146 'url':126 'usdc':14,32,76,148,188 'usdc-settlement' 'use':69 'util':65 'via':9,27,159 'wallet':169,210 'without':236 'x402':10,28,71,129,161 'x402 API' 'x402-payment'","prices":[{"id":"9b024d22-c1aa-4649-ab14-b009e3a4a655","listingId":"93e2e190-1760-46db-8445-85a33a8dfedc","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/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:11.197Z"}],"sources":[{"listingId":"93e2e190-1760-46db-8445-85a33a8dfedc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/187","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:11.197Z","lastSeenAt":"2026-04-27T12:13:02.267Z"}],"details":{"listingId":"93e2e190-1760-46db-8445-85a33a8dfedc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/187 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/187"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/187"},{"claim":"Documentation, pricing, API, and README pages show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing ACH-related data or functionality on a per-request payment basis","Integrating pay-per-call APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand financial endpoints settled in crypto"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents with USDC on Base that need to call financial endpoints autonomously","Prototyping integrations without signup or subscription commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request crypto settlement adds overhead","Anyone who needs to understand the exact endpoint behavior before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.067Z"},"updatedAt":"2026-04-27T12:13:02.267Z"}}