{"id":"264a120f-c390-4bfb-9c74-c2e9238cef10","shortId":"G5Uwgx","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/54` 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/54` path is not documented — the provider labels it generically as \"Premium API Access\" — so the exact data or service it returns is unclear. The `ach` path segment suggests it may relate to ACH (Automated Clearing House) banking or payment data, but this is speculative.\n\nPricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). Payment is handled inline via the x402 `X-PAYMENT` header; no API keys, accounts, or rate limits are advertised. The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests on the Base network. The payment recipient address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` (canonical Base USDC).\n\nDocumentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no description of what this specific endpoint returns. The landing page lists many other endpoints at $0.02 each but does not include `/api/v1/ach/54` in the visible catalog, making its purpose even less clear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","low fee API","x402 endpoint","Base USDC API","pay-per-call API","micropayment API"],"warnings":["The exact purpose and data returned by /api/v1/ach/54 is completely undocumented","No OpenAPI spec, request schema, or response schema available","Docs, pricing, and README pages render only 'Connect wallet' with no content","This endpoint path is not listed in the provider's own API catalog on the landing page","The 'ach' path segment may relate to regulated financial (ACH) data — verify compliance requirements"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/54","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/54","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 on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific function of /api/v1/ach/54 is undocumented. The endpoint does not appear in the provider's own catalog. This is effectively a stub 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'/request':12,30 '0.02':11,29,133,145,248 '000':137 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':190 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':197 '20':136 '6':143 'ACH API' 'Base USDC API' 'accept':178 'access':99 'account':160 'ach':5,23,111,119 'address':188 'advertis':165 'ai/ml':60 'analyt':59 'api':16,34,56,98,158,207 'asset':194 'autom':120 'bank':123 'base':8,26,79,138,183,199 'call':4,22 'canon':198 'captur':171 'catalog':258 'challeng':168 'clear':121,264 'collect':50 'confirm':172 'connect':216 'content':222 'contract':195 'crypto':63 'data':58,103,126 'decim':144 'descript':233 'doc':206 'document':90,201 'endpoint':6,24,38,68,174,238,246 'even':262 'exact':102 'extrem':203 'financ':62 'function':83 'generic':95 'handl':148 'header':156 'hous':122 'includ':253 'infer':61 'inlin':149 'key':17,35,159 'label':93 'land':241 'less':263 'limit':163 'list':243 'live':176 'low fee API' 'lowpaymentfee.com':45 'make':259 'mani':244 'may':116 'micropayment API' 'network':80,184 'no-api-key' 'offer':48 'openapi':226 'page':211,242 'part':42 'path':87,112 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':52 'payment':72,125,146,155,186 'payment API' 'per':3,21,54,134 'platform':46 'post':179 'post-method' 'premium':97 'price':131,208 'prompt':218 'protocol':73 'provid':92 'purpos':261 'rate':162 'readm':210 'recipi':187 'relat':117 'render':213 'request':55,135,180 'request/response':229 'requir':18,36 'return':107,239 'schema':230 'segment':113 'servic':66,105 'settl':74 'span':57 'spec':227 'specif':82,237 'specul':130 'substant':221 'success':170 'suggest':114 'thin':204 'unclear':109 'unit':139 'usdc':14,32,76,141,193,200 'usdc-base' 'use':69 'util':65 'via':9,27,150 'visibl':257 'wallet':217 'x':154 'x-payment':153 'x402':10,28,71,152,167 'x402 endpoint' 'x402-payment'","prices":[{"id":"41b8154c-7d4f-473e-b656-a17b04715911","listingId":"264a120f-c390-4bfb-9c74-c2e9238cef10","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:15.002Z"}],"sources":[{"listingId":"264a120f-c390-4bfb-9c74-c2e9238cef10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:15.002Z","lastSeenAt":"2026-04-27T12:34:23.970Z"}],"details":{"listingId":"264a120f-c390-4bfb-9c74-c2e9238cef10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/54 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Pricing is $0.02 per request across all listed endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/54"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/54"}],"useCases":["Accessing a premium ACH-related data or service endpoint with per-call USDC payment","Integrating pay-per-request APIs into agent workflows without managing API keys","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents needing keyless, on-demand API access settled in USDC on Base","Low-volume or sporadic API usage where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing a clearly specified request/response contract upfront"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.951Z"},"updatedAt":"2026-04-27T12:34:23.970Z"}}