{"id":"df07376c-040d-4202-942a-e169a2570de3","shortId":"3jekGP","kind":"x402","title":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.","description":"This endpoint at `/api/v1/ach/55` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request 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/55` path is not documented — the provider labels it generically as \"Premium API Access\" — so its exact purpose is unclear. It may relate to ACH (Automated Clearing House) banking data or operations given the URL path, but this is speculative.\n\nThe endpoint is live and returns a valid x402 challenge. Pricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02), consistent with the site-wide flat rate advertised on the landing page. Payment is made via the x402 `exact` scheme to a specified wallet address on Base. No API keys, rate limits, or subscriptions are required — callers simply attach an `X-PAYMENT` header with a valid payment proof.\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 spec, no request/response schema, and no usage examples available. The lack of documentation for this specific endpoint makes it difficult to determine what inputs it expects or what data it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","ach-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment processing API","lowpaymentfee","x402 API","USDC pay-per-call","Base network API","automated clearing house"],"warnings":["The specific function of /api/v1/ach/55 is undocumented — 'Premium API Access' is a generic label applied across the platform","All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No request or response schema is available; callers cannot know what inputs are expected or what outputs are returned","The 'ach' path segment suggests possible financial/banking operations which may be subject to regulatory requirements","This endpoint does not appear in the site's own listed API catalog, raising questions about its status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/55","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/55","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 essentially no documentation: no OpenAPI spec, no request/response schema, no examples, and no explanation of what '/api/v1/ach/55' actually does. The docs pages are empty. This is effectively a stub 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'/api/v1/ach/55':40,86 '/docs':206 '/pricing':208 '/readme':210 '/request':12,30 '0.02':11,29,138,150 '000':142 '20':141 '6':148 'ACH API' 'Base network API' 'USDC pay-per-call' 'access':99 'ach':5,23,110 'ach-endpoint' 'addit':221 'address':176 'advertis':159 'ai/ml':60 'analyt':59 'api':16,34,56,98,180 'attach':190 'autom':111 'automated clearing house' 'avail':235 'bank':114 'base':8,26,79,143,178 'base-network' 'call':4,22 'caller':188 'challeng':135 'clear':112 'collect':50 'connect':216 'consist':151 'content':222 'crypto':63 'data':58,115,255 'decim':149 'determin':248 'difficult':246 'document':90,201,239 'endpoint':6,24,38,68,127,243 'exact':102,170 'exampl':234 'expect':252 'extrem':203 'financ':62 'flat':157 'function':83 'generic':95 'given':118 'header':195 'hous':113 'infer':61 'input':250 'key':17,35,181 'label':93 'lack':237 'land':162 'limit':183 'live':129 'lowpaymentfee' 'lowpaymentfee.com':45 'made':166 'make':244 'may':107 'network':80 'no-api-key' 'offer':48 'openapi':226 'oper':117 'page':163,211 'part':42 'path':87,121 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-request':52 'payment':72,164,194,199 'payment processing API' 'per':3,21,54,139 'platform':46 'premium':97 'price':136 'prompt':218 'proof':200 'protocol':73 'provid':92 'purpos':103 'rate':158,182 'relat':108 'render':213 'request':55,140 'request/response':229 'requir':18,36,187 'return':131,257 'schema':230 'scheme':171 'servic':66 'settl':74 'simpli':189 'site':155 'site-wid':154 'span':57 'spars':204 'spec':227 'specif':82,242 'specifi':174 'specul':125 'subscript':185 'unclear':105 'unit':144 'url':120 'usag':233 'usdc':14,32,76,146 'usdc-settlement' 'use':69 'util':65 'valid':133,198 'via':9,27,167 'wallet':175,217 'wide':156 'x':193 'x-payment':192 'x402':10,28,71,134,169 'x402 API' 'x402-payment'","prices":[{"id":"5f56b88e-5c47-48fc-a7c5-db08639bafd6","listingId":"df07376c-040d-4202-942a-e169a2570de3","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:16.810Z"}],"sources":[{"listingId":"df07376c-040d-4202-942a-e169a2570de3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:16.810Z","lastSeenAt":"2026-04-27T11:03:51.569Z"}],"details":{"listingId":"df07376c-040d-4202-942a-e169a2570de3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/55 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/55"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/55"}],"useCases":["Accessing ACH-related data or operations on a per-call basis without subscription","Integrating pay-per-request financial endpoints into agent workflows","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing low-cost per-call API access without credentials","Use cases requiring USDC micropayments on Base"],"notFor":["Production workloads requiring well-documented, stable APIs","Users who need detailed request/response schemas before integration","High-volume use cases where per-request pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.798Z"},"updatedAt":"2026-04-27T11:03:51.569Z"}}