{"id":"df1925a5-f33c-4bbf-bb98-bb27bec22e7f","shortId":"hu9yUS","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/111` is listed under \"Premium API Access\" and accepts POST requests. Payment is made inline with each request via the X-PAYMENT header — no API keys, accounts, or rate limits are involved.\n\nThe x402 challenge confirms the endpoint is live, requiring up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several categories — data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All are priced at $0.02 per request. However, documentation is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. The exact functionality of the `/api/v1/ach/111` endpoint is not documented beyond its title, so the actual request schema and response format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","lowpaymentfee","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No documentation exists for /api/v1/ach/111 — the request body schema and response format are completely unknown.","All secondary pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no usable content.","The meaning of 'ACH' and '111' in the path is undocumented; it is unclear whether this relates to ACH bank transfers or something else.","No OpenAPI spec or machine-readable schema is available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/111","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/111","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation for this specific endpoint — no request schema, no response examples, no explanation of what 'ach/111' actually returns. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/api/v1/ach/111':63,208 '/docs':185 '/pricing':187 '/readme':189 '/request':12,30 '0.02':11,29,119,176 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x8335':113 '20':107 '2913':114 '300':135 '6':124 'ACH API' 'Base network API' 'USDC micropayment API' 'accept':71 'access':69 'account':90 'ach':5,23 'across':150 'actual':218 'address':131 'advertis':148 'ai/ml':154 'api':16,34,46,68,88 'application/json':143 'base':8,26,55,109,116 'base-network' 'beyond':213 'broader':145 'call':4,22 'categori':152 'challeng':98 'classif':157 'collect':40 'confirm':99 'connect':195 'convers':171 'data/analytics':153 'decim':125 'detail':202 'document':180,212 'embed':158 'endpoint':6,24,47,61,101,149,209 'equal':118 'estim':165 'exact':204 'exchang':162 'extrem':182 'feed':161 'finance/web3':159 'format':223 'function':205 'gas':164 'geocod':169 'header':86 'host':38 'howev':179 'infrastructur':167 'inlin':77 'involv':95 'json-response' 'key':17,35,89 'limit':93 'list':65 'live':103 'lowpaymentfee' 'lowpaymentfee.com':37,146 'made':76 'mime':140 'network':56 'no-api-key' 'page':190 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':74,85,127 'payment API' 'per':3,21,44,120,177 'platform':147 'post':72 'post-method' 'premium':67 'price':160,174 'prompt':197 'protocol':52 'rate':92,163 'remain':224 'render':192 'request':45,73,80,121,178,219 'requir':18,36,104 'respons':139,222 'schema':220 'second':136 'sent':129 'sentiment':155 'settl':48 'sever':151 'spars':183 'specif':60 'summar':156 'technic':201 'timeout':137 'titl':215 'type':141 'unit':110 'unknown':225 'usdc':14,32,58,112,122 'usdc-settlement' 'use':57,123 'util':168 'valid':170 'via':9,27,49,81 'wallet':196 'x':84 'x-payment':83 'x402':10,28,51,97 'x402 endpoint' 'x402-payment'","prices":[{"id":"8c99ed00-f227-4501-99c9-ce28f80dd73b","listingId":"df1925a5-f33c-4bbf-bb98-bb27bec22e7f","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/111","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:48.193Z"}],"sources":[{"listingId":"df1925a5-f33c-4bbf-bb98-bb27bec22e7f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/111","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:48.193Z","lastSeenAt":"2026-04-27T16:34:09.121Z"}],"details":{"listingId":"df1925a5-f33c-4bbf-bb98-bb27bec22e7f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/111 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/ach/111"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/111"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic ACH-related data retrieval with per-call USDC payment","Agent-driven financial API access without pre-registration or API keys","Integrating pay-as-you-go endpoints into crypto-native workflows"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with x402-compatible payment capabilities on Base","Projects needing instant access without rate limits or commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based pricing","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.123Z"},"updatedAt":"2026-04-27T16:34:09.121Z"}}