{"id":"a3c7050e-7cd4-40c7-a36d-859848bc371e","shortId":"nv4LGP","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/ach/3` is listed as \"Premium API Access\" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no upfront commitments — each request costs $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe broader 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/3` endpoint actually returns. The endpoint is live (returns a valid x402 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides. The \"ach\" path segment might suggest ACH (Automated Clearing House) payment-related data, but this is speculative.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-endpoint","no-api-key","no-rate-limit"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","low fee API","x402 endpoint","USDC pay-per-call","Base network API","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; impossible to know what this endpoint accepts or returns.","The purpose of '/api/v1/ach/3' ('Premium API Access') is undefined — the 'ach' path is ambiguous and may not relate to ACH payments at all.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but provides no evidence any of them return real data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/3","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/3","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 does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and all doc pages are empty. The purpose of '/api/v1/ach/3' is entirely 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'/request':12,30 '0.02':11,29,94,151 '000':96 '20':95 '402':203 '6':102 'ACH API' 'Base network API' 'USDC pay-per-call' 'accept':71 'access':69,217 'ach':5,23,220,225 'across':109 'actual':193 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':16,34,46,68,82,160,216 'autom':226 'base':8,26,55,97 'base-network' 'broader':105 'call':4,22,79 'categori':111 'challeng':204 'classif':126 'clear':227 'collect':40 'commit':90 'connect':169 'convers':143 'cost':93 'data':112,116,212,232 'decim':103 'descript':187 'detail':176 'doc':159 'document':154,207 'embed':127 'endpoint':6,24,47,61,108,146,192,196 'estim':137 'exampl':184 'exchang':132 'export':117 'extrem':156 'feed':131 'financ':128 'function':214 'gas':136 'generat':144 'geocod':141 'host':38 'hous':228 'infrastructur':139 'insight':118 'key':17,35,83 'learn':121 'limit':86 'list':65 'live':198 'low fee API' 'lowpaymentfee.com':37 'machin':120 'made':76 'metric':114 'micropayment API' 'might':223 'network':56 'no-api-key' 'no-rate-limit' 'openapi':180 'page':164 'path':221 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-request':42 'payment':74,230 'payment API' 'payment-rel':229 'per':3,21,44,78,152 'per-cal':77 'per-request-billing' 'platform':106 'post':72 'post-endpoint' 'premium':67,215 'price':130,149,161 'prompt':171 'protocol':52 'provid':218 'quot':135 'rate':85,133 'readm':163 'relat':231 'render':166 'report':115 'request':45,73,92,153 'request/response':183 'requir':18,36 'return':194,199 'schema':181 'segment':222 'sentiment':122 'settl':48 'sever':110 'spars':157 'specif':60 'specul':236 'suggest':224 'summar':125 'technic':175 'text':124 'token':134 'unclear':210 'uniform':148 'unit':98 'upfront':89 'usdc':14,32,58,100 'usdc-settlement' 'use':57 'util':140 'valid':142,201 'via':9,27,49 'wallet':170 'web3':129 'without':206 'x402':10,28,51,202 'x402 endpoint' 'x402-payment'","prices":[{"id":"b45fd55e-5e3e-4eb9-b36d-40bf127efe45","listingId":"a3c7050e-7cd4-40c7-a36d-859848bc371e","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:31.093Z"}],"sources":[{"listingId":"a3c7050e-7cd4-40c7-a36d-859848bc371e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:31.093Z","lastSeenAt":"2026-04-27T22:32:47.060Z"}],"details":{"listingId":"a3c7050e-7cd4-40c7-a36d-859848bc371e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/3 \\\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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/3"},{"claim":"All endpoints priced at $0.02/request 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 network","source_url":"https://lowpaymentfee.com/api/v1/ach/3"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or services with per-call USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Programmatic access to ACH-related data or functionality (speculative)"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible payment capabilities on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.914Z"},"updatedAt":"2026-04-27T22:32:47.060Z"}}