{"id":"0f5e7d96-4b11-4bc5-881a-12fd57468a15","shortId":"TXAXcV","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/137` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/137` path is not documented — the provider labels it generically as \"Premium API Access\" — so the exact data or service it returns is unclear.\n\nPricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 `exact` scheme to address `0x1A2B...85F3` using USDC (`0x8335...2913`) on Base. No API keys, rate limits, or upfront commitments are advertised. The endpoint accepts HTTP POST and returned a valid 402 challenge during probing, confirming it is live.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no description of what the `/ach/137` route specifically does. The site lists many other endpoints (analytics, AI, finance, utilities) at $0.02 each, but none share the `/ach/` path prefix, making it difficult to infer the purpose of this particular route.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","lowpaymentfee","x402 endpoint","USDC micropayment","Base network API","pay-per-call API"],"warnings":["The specific purpose of /api/v1/ach/137 is completely undocumented — the provider only labels it 'Premium API Access'","No request or response schema is available; callers cannot know what to send or what to expect back","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","The /ach/ path prefix does not appear among any of the other listed endpoints on the site, making it an outlier","ACH may relate to regulated financial services (Automated Clearing House); verify compliance requirements"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/137","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (valid 402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no description of what /api/v1/ach/137 actually does. The generic label 'Premium API Access' provides no useful information. This is effectively a stub 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'/ach/137':207 '/api/v1/ach/137':40,85 '/request':12,30 '0.02':11,29,111,125,222 '000':117 '0x1a2b':136 '0x8335':140 '20':116 '2913':141 '402':163 '6':123 '85f3':137 'ACH API' 'Base network API' 'USDC micropayment' 'accept':156 'access':98 'ach':5,23 'addit':191 'address':135 'advertis':153 'ai':218 'ai/ml':60 'analyt':59,217 'api':16,34,56,97,145,178 'base':8,26,78,118,143 'base-network' 'call':4,22 'challeng':164 'collect':50 'commit':151 'confirm':167 'connect':186 'content':192 'data':58,102 'decim':124 'descript':203 'difficult':233 'doc':176 'document':89,171 'endpoint':6,24,38,67,155,216 'exact':101,132 'extrem':173 'financ':219 'finance/web3':62 'function':82 'generic':94 'http':157 'http-post' 'infer':61,235 'infrastructur':64 'key':17,35,146 'label':92 'limit':148 'list':213 'live':170 'lowpaymentfee' 'lowpaymentfee.com':45 'made':128 'make':231 'mani':214 'maxamountrequir':114 'network':79 'no-api-key' 'none':225 'offer':48 'openapi':196 'page':181 'part':42 'particular':240 'path':86,229 'pay':2,20,53 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':52 'payment':71,126 'payment API' 'per':3,21,54,112 'platform':46 'post':158 'prefix':230 'premium':96 'price':109,177 'probe':166 'prompt':188 'protocol':72 'provid':91 'purpos':237 'rate':147 'readm':180 'render':183 'request':55,113 'request/response':199 'requir':18,36 'return':106,160 'rout':208,241 'schema':200 'scheme':133 'servic':104 'settl':73 'share':226 'site':212 'span':57 'spars':174 'spec':197 'specif':81,209 'unclear':108 'unit':119 'upfront':150 'usdc':14,32,75,121,139 'usdc-settlement' 'use':68,138 'util':65,220 'valid':162 'via':9,27,129 'wallet':187 'x402':10,28,70,131 'x402 endpoint' 'x402-payment'","prices":[{"id":"571cef1b-3296-4387-84f8-672e129a0748","listingId":"0f5e7d96-4b11-4bc5-881a-12fd57468a15","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:55.466Z"}],"sources":[{"listingId":"0f5e7d96-4b11-4bc5-881a-12fd57468a15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/137","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:55.466Z","lastSeenAt":"2026-04-27T15:05:15.717Z"}],"details":{"listingId":"0f5e7d96-4b11-4bc5-881a-12fd57468a15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/137 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/137"},{"claim":"Site advertises $0.02/request 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","source_url":"https://lowpaymentfee.com/api/v1/ach/137"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an ACH-related service with per-call USDC payment","Agent-driven API consumption without pre-registration or API keys","Integrating x402-compatible payment flows into automated workflows"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agents on Base network","Low-volume or exploratory usage where $0.02/call is acceptable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume batch processing where per-call pricing may add up","Anyone needing clarity on what the endpoint actually returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.78Z"},"updatedAt":"2026-04-27T15:05:15.717Z"}}