{"id":"5738d084-0ad9-471e-a3e9-6db8ebb12bdc","shortId":"hXHPs8","kind":"x402","title":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC","tagline":"Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC","description":"This endpoint at `/api/v1/ach/156` 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 commitments required.\n\nThe specific endpoint `/api/v1/ach/156` is listed under the generic title \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. The payment timeout is 300 seconds.\n\nHowever, the exact functionality of this particular endpoint (`/ach/156`) is unclear. It does not appear in the site's listed API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), and the description is simply \"Premium API Access\" with no further documentation. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation or schema details, the actual input parameters and response format for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","low fee API","x402 endpoint","USDC API","Base network API","pay-per-call","micropayment API"],"warnings":["The exact functionality of /api/v1/ach/156 is unknown — it is not listed among the site's documented API categories","No input parameters or response schema are documented anywhere","All documentation pages (docs, pricing, README, api) return only a 'Connect wallet' prompt with no content","The endpoint path suggests ACH (Automated Clearing House) functionality but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/156","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/156","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 input/output schema, and the purpose of '/api/v1/ach/156' is entirely undocumented. The docs, pricing, and README pages are empty beyond a wallet-connect 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'/api/v1/ach/156':32,86 '/request':12,26 '0.02':11,25,131 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':120 '300':138 '6':126 'ACH API' 'Base network API' 'USDC API' 'accept':69,103 'access':95,176 'ach':5,19 'actual':204 'ai':164 'ai/ml':52 'amount':117 'analyt':51,163 'api':48,74,94,160,175 'appear':154 'base':8,22,67,114,122 'base-network' 'call':4,18 'categori':161 'challeng':98 'collect':42 'commit':81 'confirm':99 'connect':191 'content':197 'contract':111 'crypto':55 'data':50,162 'decim':127 'descript':171 'detail':202 'doc':182 'document':180,199 'endpoint':6,20,30,60,85,147,212 'equal':130 'exact':142 'financ':54,166 'format':209 'function':143 'generic':91 'howev':140 'http-post' 'infer':53 'infrastructur':168 'input':205 'key':75 'limit':78 'list':88,159 'live':102 'low fee API' 'lowpaymentfee.com':37 'maximum':116 'micropayment API' 'ml':165 'network':68 'no-api-key' 'offer':40 'page':186 'paramet':206 'part':34 'particular':146 'pay':2,16,45 'pay-per-cal':1,15 'pay-per-call' 'pay-per-request':44 'payment':71,108,135 'payment API' 'per':3,17,46,132 'platform':38 'post':104 'premium':93,174 'price':183 'prompt':193 'protocol':64 'rate':77 'readm':185 'remain':213 'request':47,105,133 'requir':82,118 'respons':208 'return':188 'schema':201 'second':139 'servic':58 'settl':107 'simpli':173 'site':157 'span':49 'specif':84 'substant':196 'timeout':136 'titl':92 'unclear':150 'unit':123 'unknown':214 'usdc':14,28,70,110,129 'usdc-settlement' 'use':61 'util':57 'via':9,23 'wallet':192 'web3':167 'without':198 'x402':10,24,63,97 'x402 endpoint' 'x402-payment'","prices":[{"id":"e8325f24-2369-4666-aade-32731fd2a081","listingId":"5738d084-0ad9-471e-a3e9-6db8ebb12bdc","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/156","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:57.935Z"}],"sources":[{"listingId":"5738d084-0ad9-471e-a3e9-6db8ebb12bdc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/156","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:57.935Z","lastSeenAt":"2026-04-27T15:05:15.845Z"}],"details":{"listingId":"5738d084-0ad9-471e-a3e9-6db8ebb12bdc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/156 \\\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 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":"The x402 challenge shows maxAmountRequired of 20000 base units in USDC (6 decimals) = $0.02, with 300-second timeout on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/156"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/156"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an ACH-related service with per-call USDC micropayments","Agent-driven workflows needing keyless, pay-as-you-go API access on Base","Integrating low-cost API calls settled on-chain without subscription commitments"],"bestFor":["Developers wanting no-signup, pay-per-request API access","AI agents with x402-compatible wallets on Base","Users who prefer on-chain USDC settlement over traditional billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring known, well-documented input/output schemas","High-volume use cases where per-request crypto settlement adds overhead"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.655Z"},"updatedAt":"2026-04-27T15:05:15.845Z"}}