{"id":"fca85c39-1a0f-4ee6-9586-d1207c5edb76","shortId":"TEvaej","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/161` 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/161` endpoint is not documented beyond its listing title \"Premium API Access,\" so its exact capabilities are unclear — it may relate to ACH (Automated Clearing House) payment processing or data, given the URL path.\n\nPricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC, which has 6 decimals, equaling $0.02). The platform advertises no API keys, no rate limits, no minimums, and instant access. Payment is made via the x402 `exact` scheme to a specified wallet address on Base. The endpoint accepts HTTP POST requests and returns `application/json` responses.\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. Prospective users should be aware that the actual behavior of `/api/v1/ach/161` is undocumented and would need to be discovered through experimentation.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","http-post","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment processing API","lowpaymentfee","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["The exact functionality of /api/v1/ach/161 is completely undocumented — the 'ACH' path segment suggests payment/banking data but this is unconfirmed.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No OpenAPI schema, request format, or response examples are available.","No rate limit or uptime guarantees are documented despite the claim of 'no rate limits'."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/161","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge) and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation whatsoever for this specific endpoint — no request schema, no response schema, no examples, and no description of what it actually does. The docs pages are empty beyond a wallet connect prompt. The listing is effectively a 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'/request':12,30 '0.02':11,29,122,143 '000':133 '20':132 '6':140 'ACH API' 'Base network API' 'USDC micropayment API' 'accept':175 'access':97,157 'ach':5,23,108 'actual':232 'address':170 'advertis':128,146 'ai/ml':60 'analyt':59 'api':16,34,56,96,148,190 'application/json':181 'autom':109 'awar':229 'base':8,26,79,134,172 'behavior':233 'beyond':91 'call':4,22 'capabl':101 'challeng':127 'clear':110 'collect':50 'connect':198 'content':204 'crypto':63 'data':58,115,218 'decim':141 'descript':215 'discov':243 'doc':188 'document':90,183 'endpoint':6,24,38,68,87,174,223 'equal':142 'exact':100,164 'exampl':212 'experiment':245 'extrem':185 'financ':62 'function':83,220 'given':116 'hous':111 'http':176 'http-post' 'infer':61 'instant':156 'json-response' 'key':17,35,149 'limit':152 'list':93 'lowpaymentfee' 'lowpaymentfee.com':45 'made':160 'maxamountrequir':130 'may':105 'minimum':154 'need':240 'network':80 'no-api-key' 'offer':48 'openapi':208 'page':193 'part':42 'path':119 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':52 'payment':72,112,158 'payment processing API' 'per':3,21,54,123 'platform':46,145 'post':177 'premium':95 'price':120,189 'process':113 'prompt':200 'prospect':225 'protocol':73 'provid':224 'rate':151 'readm':192 'relat':106 'render':195 'request':55,124,178 'request/response':211 'requir':18,36 'respons':182 'return':180 'schema':209 'scheme':165 'servic':66 'settl':74 'span':57 'spars':186 'specif':82,222 'specifi':168 'titl':94 'unclear':103 'undocu':237 'unit':135 'url':118 'usdc':14,32,76,137 'usdc-base-network' 'use':69 'user':226 'util':65 'via':9,27,161 'wallet':169,199 'would':239 'x402':10,28,71,126,163 'x402 endpoint' 'x402-payment'","prices":[{"id":"068203f0-6bb0-475a-a48b-0b36b22a9224","listingId":"fca85c39-1a0f-4ee6-9586-d1207c5edb76","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:05.194Z"}],"sources":[{"listingId":"fca85c39-1a0f-4ee6-9586-d1207c5edb76","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/161","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:05.194Z","lastSeenAt":"2026-04-27T14:04:43.135Z"}],"details":{"listingId":"fca85c39-1a0f-4ee6-9586-d1207c5edb76","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/161 \\\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 with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/161"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/161"},{"claim":"Platform offers APIs across data/analytics, AI/ML, finance/web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing ACH-related data or functionality on a per-request payment basis","Integrating pay-per-call financial endpoints into agent workflows without API key management","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agent-based systems needing keyless, pay-per-request API access","Low-volume or sporadic API usage where subscriptions are unnecessary"],"notFor":["Users who need well-documented APIs with clear request/response schemas","High-volume production workloads where per-request pricing at $0.02 adds up","Anyone requiring guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.297Z"},"updatedAt":"2026-04-27T14:04:43.135Z"}}