{"id":"216e6038-91b8-46f2-9dd5-7aa8ffcf07c8","shortId":"bjx4a4","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/148` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no commitments required.\n\nThe specific `/api/v1/ach/148` path falls under a \"Premium API Access\" label, but the site does not provide documentation explaining what this particular endpoint returns or accepts. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The response MIME type is `application/json`.\n\nDocumentation across the site 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 spec, no request/response schema, and no description of what \"ach/148\" specifically provides. The endpoint name suggests it may relate to ACH (Automated Clearing House) banking data or operations, but this is speculative. Prospective users should test the endpoint directly to determine its actual functionality.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","low fee API","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","The purpose of /api/v1/ach/148 is unknown; 'Premium API Access' is a generic label with no specifics","No OpenAPI spec or request/response schema provided","No examples of input or output available","The 'ach' path component may imply financial/banking operations which could be subject to regulation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/148","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/148","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 challenge, but there is zero documentation on what /api/v1/ach/148 actually does, no request/response schema, and no examples. The docs pages are empty. This is effectively a stub 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'/request':12,26 '0.02':11,25,132 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '20':126 '6':137 'ACH API' 'Base network API' 'USDC micropayment API' 'accept':71,110,119 'access':94 'ach':5,19,202 'ach/148':191 'across':154 'actual':224 'address':143 'ai/ml':52 'analyt':51 'api':48,76,93,163 'application/json':152 'autom':203 'bank':206 'base':8,22,69,128,146 'base-network' 'call':4,18,140 'challeng':113 'clear':204 'commit':83 'confirm':114 'connect':171 'content':177 'data':50,207 'decim':138 'descript':188 'determin':222 'direct':220 'doc':161 'document':102,153 'endpoint':6,20,30,60,107,116,195,219 'explain':103 'extrem':158 'fall':89 'financ':54 'function':225 'gate':62 'hous':205 'infer':53 'infrastructur':57 'json-response' 'key':77 'label':95 'limit':80 'live':118 'low fee API' 'lowpaymentfee.com':37 'may':199 'mime':149 'name':196 'network':70 'no-api-key' 'offer':40 'openapi':181 'oper':209 'page':166 'paid':141 'part':34 'particular':106 'path':88 'pay':2,16,45 'pay-per-cal':1,15 'pay-per-call API' 'pay-per-request':44 'payment':73 'payment API' 'per':3,17,46,139 'platform':38 'post':120 'premium':92 'price':162 'prompt':173 'prospect':214 'protocol':66 'provid':101,193 'rate':79 'readm':165 'relat':200 'render':168 'request':47,121 'request/response':184 'requir':84,123 'respons':148 'return':108 'schema':185 'sinc':134 'site':98,156 'span':49 'spars':159 'spec':182 'specif':86,192 'specul':213 'suggest':197 'suit':42 'test':217 'type':150 'unit':129 'usd':133 'usdc':14,28,72,131,135 'usdc-payment' 'use':136 'user':215 'util':58 'via':9,23,63 'wallet':172 'web3':55 'x402':10,24,65,112 'x402 endpoint' 'x402-payment'","prices":[{"id":"c59dfdf7-e025-4eee-acd0-3ce35f572d7b","listingId":"216e6038-91b8-46f2-9dd5-7aa8ffcf07c8","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/148","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:00.979Z"}],"sources":[{"listingId":"216e6038-91b8-46f2-9dd5-7aa8ffcf07c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/148","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:00.979Z","lastSeenAt":"2026-04-27T13:33:33.840Z"}],"details":{"listingId":"216e6038-91b8-46f2-9dd5-7aa8ffcf07c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/148 \\\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 endpoint returns a 402 x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/148"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/148"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing ACH-related data or operations on a per-request basis without subscription","Integrating pay-per-call financial endpoints into agent workflows","Testing x402 protocol-based API consumption on Base"],"bestFor":["Developers experimenting with x402 pay-per-request APIs","Agents needing low-cost per-call access without API key management","Users who want to pay in USDC on Base for individual API calls"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who need bulk pricing or SLAs","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.508Z"},"updatedAt":"2026-04-27T13:33:33.840Z"}}