{"id":"92c08d7c-51d8-4807-ac7d-8b09c2f90b71","shortId":"knCPkj","kind":"x402","title":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. This specific endpoint (`/api/v1/ach/99`) is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.\n\nDocumentation is extremely sparse. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/ach/99` endpoint actually returns. The endpoint name suggests ACH (Automated Clearing House) payment-related functionality, but this is speculative — the crawled material provides no confirmation of the endpoint's actual behavior or output format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["ach api","payment processing api","lowpaymentfee","x402 api","usdc micropayment","base network api","pay per call api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or output schema describing request parameters or response format","The actual functionality of /api/v1/ach/99 is unknown; 'ACH' in the path is suggestive but unconfirmed","If this endpoint involves real financial transactions (ACH transfers), it may be subject to financial regulation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/99","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/99","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 captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The docs pages are all blank 'Connect wallet' stubs. The endpoint path '/api/v1/ach/99' is opaque without further 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'/api/v1/ach/99':60,207 '/call':12,30 '/docs':175 '/pricing':177 '/readme':179 '0.02':11,29,92,167 '000':87 '0x8335':77 '20':86 '2913':78 '6':97 'accept':68 'access':66 'ach':5,23,215 'ach api' 'across':125 'actual':209,237 'advertis':123 'ai':135 'analysi':139 'analyt':129 'api':16,34,46,65,100 'attach':111 'autom':216 'base':8,26,55,80,88 'base network api' 'base-network' 'behavior':238 'broader':120 'caller':109 'categori':127 'classif':142 'clear':217 'collect':40 'commit':106 'confirm':232 'connect':185 'contract':76 'convers':159 'cost':84 'crawl':228 'data':128,132 'decim':98 'descript':203 'detail':192 'document':170 'embed':143 'endpoint':6,24,47,59,124,162,208,212,235 'equal':91 'estim':153 'exampl':200 'exchang':148 'export':133 'extrem':172 'feed':147 'financ':144 'format':241 'function':222 'gas':152 'gate':48 'generat':160 'geocod':157 'header':115 'host':38 'hous':218 'infrastructur':155 'insight':134 'key':17,35,101 'learn':137 'limit':103 'list':62 'lowpaymentfee' 'lowpaymentfee.com':37,121 'machin':136 'materi':229 'maximum':83 'metric':130 'name':213 'network':56 'no-api-key' 'openapi':196 'output':240 'page':180 'pay':2,20,43 'pay per call api' 'pay-per-request':1,19,42 'payment':71,114,220 'payment processing api' 'payment-rel':219 'per':3,21,44,93,168 'platform':122 'post':69 'post-method' 'premium':64 'price':146,165 'prompt':187 'protocol':52 'provid':230 'quot':151 'rate':102,149 'relat':221 'render':182 'report':131 'request':4,22,45,70,94,118,169 'request/response':199 'requir':18,36,108 'return':210 'schema':197 'sentiment':138 'settl':73 'sever':126 'simpli':110 'spars':173 'specif':58 'specul':226 'suggest':214 'summar':141 'technic':191 'text':140 'token':150 'uniform':164 'unit':89 'upfront':105 'usdc':14,32,75,95 'usdc micropayment' 'usdc-settlement' 'use':96 'util':156 'valid':158 'via':9,27 'wallet':186 'web3':145 'x402':10,28,51,113 'x402 api' 'x402-payment'","prices":[{"id":"456a4b50-451f-4070-b4bc-2038d4206c7b","listingId":"92c08d7c-51d8-4807-ac7d-8b09c2f90b71","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:24.646Z"}],"sources":[{"listingId":"92c08d7c-51d8-4807-ac7d-8b09c2f90b71","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:24.646Z","lastSeenAt":"2026-04-27T09:33:29.940Z"}],"details":{"listingId":"92c08d7c-51d8-4807-ac7d-8b09c2f90b71","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/99 \\\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":"The endpoint returns a 402 x402 challenge requesting 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/99"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/99"}],"useCases":["Programmatic access to ACH-related data or operations via a single micropayment per call","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Integrating low-cost per-request financial endpoints without subscription overhead"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Prototyping workflows that need instant API access without signup"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume batch processing where per-request pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:30.34Z"},"updatedAt":"2026-04-27T09:33:29.940Z"}}