{"id":"f4f6eabf-2052-49e2-a881-6da2044bad64","shortId":"eHuqNa","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/32` 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/32` 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) payment processing or financial 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 maximum amount required is 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimal places. This matches the provider's advertised flat rate of $0.02 per request across all their APIs. Payment is made via the x402 `exact` scheme to the specified payTo address, with a 300-second timeout. No API keys or accounts are needed — access is granted purely through per-call USDC payment.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint accepts or returns beyond `application/json`. The provider's landing page lists many endpoints but does not describe `/api/v1/ach/32` among them, making it an unlisted or less-promoted route.","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 processing API","x402 API","USDC pay-per-call","lowpaymentfee","Base network API","micropayment API"],"warnings":["The specific function of /api/v1/ach/32 is undocumented — the 'ACH' in the path suggests payment/banking functionality but this is unconfirmed","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content","This endpoint is not listed among the provider's advertised APIs on the homepage","No request or response schema is available — callers cannot know what to send or expect back","If this endpoint relates to ACH banking, it may fall under financial regulation (e.g., money transmission)"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/32","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/32","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 per request), but there is zero documentation on what this specific endpoint does, what inputs it accepts, or what it returns. The docs pages are empty. The endpoint path '/api/v1/ach/32' is not listed on the provider's homepage, making its purpose entirely 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'/request':12,30 '0.02':11,29,157,173 '000':147 '0x8335':152 '20':146 '300':195 '6':161 'ACH API' 'Base network API' 'USDC pay-per-call' 'accept':138,253 'access':99,205 'account':202 'ach':5,23,110 'across':176 'address':192 'advertis':169 'ai/ml':60 'among':271 'amount':143 'analyt':59 'api':16,34,56,98,179,199,221 'application/json':257 'autom':111 'base':8,26,79,123,148,154 'base-network' 'beyond':256 'call':4,22,212 'challeng':131 'clear':112 'collect':50 'confirm':132 'connect':230 'content':236 'crypto':63 'data':58,118 'decim':162 'describ':269 'descript':247 'doc':220 'document':90,215 'endpoint':6,24,38,68,134,252,265 'equal':156 'exact':102,186 'exampl':244 'extrem':217 'financ':62 'financi':117 'flat':170 'function':83 'generic':95 'given':158 'grant':207 'hous':113 'infer':61 'json-response' 'key':17,35,200 'label':93 'land':261 'less':279 'less-promot':278 'list':263 'live':136 'lowpaymentfee' 'lowpaymentfee.com':45 'made':182 'make':273 'mani':264 'match':165 'maximum':142 'may':107 'micropayment API' 'need':204 'network':80 'no-api-key' 'offer':48 'openapi':240 'page':225,262 'part':42 'path':87,128 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-request':52 'payment':72,114,180,214 'payment processing API' 'payto':191 'per':3,21,54,174,211 'per-cal':210 'place':163 'platform':46 'post':139 'post-endpoint' 'premium':97 'price':222 'process':115 'promot':280 'prompt':232 'protocol':73 'provid':92,167,259 'pure':208 'purpos':103 'rate':171 'readm':224 'relat':108 'render':227 'request':55,140,175 'request/response':243 'requir':18,36,144 'return':255 'rout':281 'schema':241 'scheme':187 'second':196 'servic':66 'settl':74 'sole':124 'span':57 'spars':218 'specif':82,251 'specifi':190 'specul':122 'substant':235 'timeout':197 'unclear':105 'unit':149 'unlist':276 'url':127 'usdc':14,32,76,151,159,213 'usdc-settlement' 'use':69 'util':65 'via':9,27,183 'wallet':231 'x402':10,28,71,130,185 'x402 API' 'x402-payment'","prices":[{"id":"f2aa731e-cef8-496e-a895-535506ccb616","listingId":"f4f6eabf-2052-49e2-a881-6da2044bad64","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:31.696Z"}],"sources":[{"listingId":"f4f6eabf-2052-49e2-a881-6da2044bad64","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:31.696Z","lastSeenAt":"2026-04-27T22:32:47.079Z"}],"details":{"listingId":"f4f6eabf-2052-49e2-a881-6da2044bad64","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/32 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/32"},{"claim":"The provider advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/32"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a pay-per-call ACH-related endpoint without needing API keys or subscriptions","Integrating x402-compatible payment flows into agent workflows","Making low-cost per-request API calls settled in USDC on Base"],"bestFor":["Developers or agents already using x402 payment protocol","Users who want keyless, pay-as-you-go API access","Crypto-native applications on the Base network"],"notFor":["Anyone needing documented request/response schemas before integration","Use cases requiring high-throughput batch processing with predictable billing","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.913Z"},"updatedAt":"2026-04-27T22:32:47.079Z"}}