{"id":"b1dbc5f2-4e21-402b-a492-f50d7cc96962","shortId":"BJceyy","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/174` 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/174` path is not documented — the listing title is simply \"Premium API Access\" and no schema or documentation describes what this particular route returns. The broader platform advertises categories like ACH (likely related to financial/payment data), but concrete input/output details are unavailable.\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 endpoint is live and returns a valid 402 challenge when called without payment. The platform's documentation, pricing, and README pages all resolve but contain no substantive content beyond a \"Connect wallet\" prompt, so the actual behavior of this endpoint remains opaque.\n\nBecause there is no OpenAPI spec, no request/response examples, and no description of what data this endpoint provides, agents should treat this as a low-documentation endpoint. It may be useful for experimentation with x402 payment flows on Base, but its practical utility cannot be confirmed without further probing.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","ach-endpoint"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","x402 endpoint","USDC micropayment","Base network API","lowpaymentfee","pay-per-call API"],"warnings":["No documentation exists for /api/v1/ach/174 — its purpose and data returned are unknown","All doc pages (docs, pricing, README, api) render only a 'Connect wallet' prompt with no content","No OpenAPI or schema available for request or response formats","The 'ACH' path segment suggests financial/payment data but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/174","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/174","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 402 challenge, but there is zero documentation on what the endpoint actually does, no OpenAPI spec, no request/response examples, and the docs/pricing/README pages are empty. The listing is effectively a 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'/request':12,30 '0.02':11,29,130,142 '000':134 '20':133 '402':171 '6':140 'ACH API' 'Base network API' 'USDC micropayment' 'access':98 'account':157 'ach':5,23,116 'ach-endpoint' 'actual':199 'advertis':113,162 'agent':224 'ai/ml':60 'analyt':59 'api':16,34,56,97,155 'base':8,26,79,135,245 'base-network' 'behavior':200 'beyond':192 'broader':111 'call':4,22,174 'cannot':250 'categori':114 'challeng':172 'collect':50 'concret':123 'confirm':252 'connect':194 'contain':188 'content':191 'crypto':63 'data':58,121,220 'decim':141 'describ':104 'descript':217 'detail':125 'document':90,103,180,232 'endpoint':6,24,38,68,164,203,222,233 'exampl':214 'experiment':239 'financ':62 'financial/payment':120 'flow':243 'function':83 'handl':145 'header':153 'infer':61 'inlin':146 'input/output':124 'key':17,35,156 'like':115,117 'limit':160 'list':92 'live':166 'low':231 'low-document':230 'lowpaymentfee' 'lowpaymentfee.com':45 'may':235 'network':80 'no-api-key' 'offer':48 'opaqu':205 'openapi':210 'page':184 'part':42 'particular':107 'path':87 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':52 'payment':72,143,152,176,242 'payment API' 'per':3,21,54,131 'platform':46,112,178 'practic':248 'premium':96 'price':128,181 'probe':255 'prompt':196 'protocol':73 'provid':223 'rate':159 'readm':183 'relat':118 'remain':204 'request':55,132 'request/response':213 'requir':18,36 'resolv':186 'return':109,168 'rout':108 'schema':101 'servic':66 'settl':74 'simpli':95 'span':57 'spec':211 'specif':82 'substant':190 'titl':93 'treat':226 'unavail':127 'unit':136 'usdc':14,32,76,138 'usdc-settlement' 'use':69,237 'util':65,249 'valid':170 'via':9,27,147 'wallet':195 'without':175,253 'x':151 'x-payment':150 'x402':10,28,71,149,241 'x402 endpoint' 'x402-payment'","prices":[{"id":"03ce1c4a-102d-479d-a9e8-90e0abb78670","listingId":"b1dbc5f2-4e21-402b-a492-f50d7cc96962","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:05.806Z"}],"sources":[{"listingId":"b1dbc5f2-4e21-402b-a492-f50d7cc96962","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/174","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:05.806Z","lastSeenAt":"2026-04-27T13:33:33.957Z"}],"details":{"listingId":"b1dbc5f2-4e21-402b-a492-f50d7cc96962","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/174 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/174"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/174"},{"claim":"maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/ach/174"}],"useCases":["Testing x402 payment protocol integrations on Base","Accessing ACH-related financial data (unconfirmed)","Agent-driven pay-per-call API consumption without API key management"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-request API access on Base","Prototyping micropayment-gated API architectures"],"notFor":["Production use cases requiring documented input/output schemas","Users needing detailed API documentation or support","High-volume batch processing where per-request pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.299Z"},"updatedAt":"2026-04-27T13:33:33.957Z"}}