{"id":"765e89ed-a5a8-4354-b5d9-73bebc5baed9","shortId":"Q828HC","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/173` 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 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/173` endpoint is not documented beyond its title \"Premium API Access\"; it sits under a path prefix suggesting ACH (Automated Clearing House) or payment-related functionality, but no schema, input parameters, or response format are published.\n\nPricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each POST request. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payment on Base mainnet (USDC contract `0x8335…2913`).\n\nDocumentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema, and no usage examples. The exact functionality behind this particular endpoint path (`/ach/173`) remains unclear, making it difficult to evaluate what data or service is actually returned after payment.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ach-endpoint","post-method","no-api-key"],"categories":["finance","payments"],"synonyms":["ACH API","payment processing API","lowpaymentfee","x402 USDC endpoint","Base network API","automated clearing house","pay-per-call API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no technical content","The exact functionality of /api/v1/ach/173 is unknown; the 'Premium API Access' title is generic and uninformative","No request or response schema is published; callers cannot know what to send or what to expect back","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/173","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/173","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 essentially no documentation: no OpenAPI spec, no request/response schema, no examples, and no explanation of what the /ach/173 path actually does. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/ach/173':32,78 '/request':12,26 '0.02':11,25,117,129 '000':121 '0x8335':172 '20':120 '2913':173 '6':127 'ACH API' 'Base network API' 'accept':165 'access':88,141 'ach':5,19,96 'ach-endpoint' 'actual':230 'addit':194 'advertis':132 'ai/ml':52 'analyt':51 'api':48,87,134,180 'attach':144 'autom':97 'automated clearing house' 'base':8,22,71,122,168 'behind':212 'beyond':83 'call':4,18 'caller':142 'captur':158 'challeng':155 'clear':98 'collect':42 'confirm':159 'connect':189 'content':196 'contract':171 'crypto':55 'data':50,226 'decim':128 'difficult':222 'doc':179 'document':82,174 'endpoint':6,20,30,60,79,161,215 'evalu':224 'exact':210 'exampl':208 'extrem':176 'financ':54 'format':112 'function':75,104,211 'header':148 'hous':99 'infer':53 'input':108 'instant':140 'key':135 'limit':138 'live':163 'lowpaymentfee' 'lowpaymentfee.com':37 'mainnet':169 'make':220 'network':72 'no-api-key' 'offer':40 'openapi':200 'page':184 'paramet':109 'part':34 'particular':214 'path':93,216 'pay':2,16,45 'pay-per-cal':1,15 'pay-per-call API' 'pay-per-request':44 'payment':64,102,147,166,233 'payment processing API' 'payment-rel':101 'per':3,17,46,118 'platform':38,131 'post':151 'post-method' 'prefix':94 'premium':86 'price':115,181 'prompt':191 'protocol':65 'publish':114 'rate':137 'readm':183 'relat':103 'remain':218 'render':186 'request':47,119,152 'request/response':203 'respons':111 'return':231 'schema':107,204 'servic':58,228 'settl':66 'simpli':143 'sit':90 'span':49 'spec':201 'specif':74 'success':157 'suggest':95 'technic':195 'thin':177 'titl':85 'unclear':219 'unit':123 'usag':207 'usdc':14,28,68,125,170 'usdc-base' 'use':61 'util':57 'via':9,23 'wallet':190 'x402':10,24,63,146,154 'x402 USDC endpoint' 'x402-payment'","prices":[{"id":"b0223d9f-3bde-4df0-bf8b-17b5a352ce1e","listingId":"765e89ed-a5a8-4354-b5d9-73bebc5baed9","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/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:05.195Z"}],"sources":[{"listingId":"765e89ed-a5a8-4354-b5d9-73bebc5baed9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/173","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:05.195Z","lastSeenAt":"2026-04-24T22:32:11.259Z"}],"details":{"listingId":"765e89ed-a5a8-4354-b5d9-73bebc5baed9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/173 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals) on Base network","source_url":"https://lowpaymentfee.com/api/v1/ach/173"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ach/173"},{"claim":"Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to ACH or payment-related data via a single micropayment per call","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Integrating low-cost financial endpoints into automated pipelines without subscription commitments"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents with x402-compatible wallets on Base","Prototyping workflows that need cheap, on-demand API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production use cases where $0.02/request adds up without bulk discounts","Anyone needing a clearly specified request/response contract before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.383Z"},"updatedAt":"2026-04-24T22:32:11.259Z"}}