{"id":"2dd2983e-6044-466d-891d-788d5facb8c0","shortId":"X3YXWC","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/199` 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 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no upfront commitments.\n\nThe specific function of the `/api/v1/ach/199` path is not documented on the site — the landing page lists endpoints across categories like analytics, AI, finance, and infrastructure, but this particular ACH route does not appear among them. The \"ACH\" prefix and numeric ID (199) suggest it may relate to ACH (Automated Clearing House) payment processing or lookup, but this is speculative. The x402 challenge confirms the endpoint is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (i.e., $0.02) per call on the Base network.\n\nThe platform's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed description of what this endpoint returns. Agents should be aware that the actual functionality behind this endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ach-endpoint","no-api-key","post-method"],"categories":["finance","payments"],"synonyms":["ACH API","ACH lookup","payment processing API","low fee API","x402 USDC endpoint","Base network API","micropayment API"],"warnings":["The /api/v1/ach/199 endpoint is not listed among the provider's documented APIs — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no usable content.","No request or response schema is available; callers cannot know what to send or what to expect back.","The 'ACH' designation may relate to regulated financial services (Automated Clearing House); verify compliance requirements before use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/199","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/199","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 the specific functionality of /api/v1/ach/199 is undocumented. No request/response schema, no docs content, and the endpoint doesn't appear in the site's own API listing. This is effectively a stub 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'/api/v1/ach/199':40,96 '/docs':186 '/pricing':187 '/readme':189 '/request':12,30 '0.02':11,29,174 '000':168 '199':133 '20':167 'ACH API' 'ACH lookup' 'Base network API' 'accept':77,159 'ach':5,23,120,128,139 'ach-endpoint' 'across':109 'actual':223 'agent':217 'ai':113 'ai/ml':60 'among':125 'analyt':59,112 'api':16,34,56,82 'appear':124 'autom':140 'avail':231 'awar':220 'base':8,26,75,169,179 'behind':225 'call':4,22,176 'categori':110 'challeng':153 'charg':163 'clear':141 'collect':50 'commit':90 'confirm':154 'connect':194 'content':200 'crypto':63 'data':58 'descript':211 'detail':210 'document':100,184,206 'endpoint':6,24,38,68,108,156,215,227 'exampl':208 'financ':62,114 'function':93,224 'hous':142 'i.e':173 'id':132 'infer':61 'infrastructur':116 'key':17,35,83 'land':105 'like':111 'limit':86 'list':107 'live':158 'lookup':146 'low fee API' 'lowpaymentfee.com':45 'materi':232 'maximum':165 'may':136 'micropayment API' 'network':76,180 'no-api-key' 'numer':131 'offer':48 'page':106,185 'part':42 'particular':119 'path':97 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-request':52 'payment':79,143 'payment processing API' 'per':3,21,54,175 'platform':46,182 'post':160 'post-method' 'prefix':129 'process':144 'prompt':196 'protocol':72 'rate':85 'relat':137 'request':55,161 'request/response':207 'requir':18,36 'return':191,216 'rout':121 'schema':205 'servic':66 'site':103 'span':57 'specif':92 'specul':150 'substant':199 'suggest':134 'unclear':229 'unit':170 'upfront':89 'usdc':14,32,78,172 'usdc-base' 'use':69 'util':65 'via':9,27 'wallet':195 'x402':10,28,71,152 'x402 USDC endpoint' 'x402-payment'","prices":[{"id":"8064c397-da5f-4e99-84ea-cb3d01d3a553","listingId":"2dd2983e-6044-466d-891d-788d5facb8c0","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/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:07.601Z"}],"sources":[{"listingId":"2dd2983e-6044-466d-891d-788d5facb8c0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:07.601Z","lastSeenAt":"2026-04-24T22:32:11.400Z"}],"details":{"listingId":"2dd2983e-6044-466d-891d-788d5facb8c0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/199 \\\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 platform charges $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge confirms the endpoint is live, accepts POST, and requires a max of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/ach/199"},{"claim":"The /api/v1/ach/199 endpoint does not appear in the provider's listed API catalog.","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying ACH-related data or initiating ACH-related operations via a single paid API call","Integrating pay-per-use financial endpoints into agent workflows without managing API keys","Programmatic access to payment or clearing house information on a per-request basis"],"bestFor":["Agents needing keyless, pay-per-call access to financial/ACH endpoints","Developers prototyping with x402 micropayments on Base","Use cases requiring no subscription or rate-limit constraints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume batch ACH processing where per-request pricing is inefficient","Anyone needing non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.187Z"},"updatedAt":"2026-04-24T22:32:11.400Z"}}