{"id":"40373a4d-e719-4f88-b235-7c432984f4bc","shortId":"YEVu3s","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API marketplace that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/ach/193` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform hosts endpoints across four 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 and settle via USDC on Base.\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 spec, no request/response schema documentation, and no example payloads available. The specific functionality behind the `/api/v1/ach/193` path is unclear; the \"ach\" segment might suggest ACH (Automated Clearing House) payment-related data, but this is speculative. The endpoint is confirmed live via a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["finance","data","infrastructure"],"synonyms":["lowpaymentfee","micropayment API","pay-per-request API","x402 API","USDC API access","Base network API","ACH API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no technical content.","No OpenAPI or schema definition found for any endpoint.","The specific functionality of /api/v1/ach/193 ('Premium API Access') is undocumented and unclear.","No example request or response payloads are available.","The 'ach' path segment may imply ACH payment data, which could fall under financial regulation — exercise caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/193","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/ach/193 is unknown. This is effectively a stub 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'/api/v1/ach/193':62,206 '/docs':169 '/pricing':171 '/readme':173 '/request':17,34 '0.02':16,33,82,155 '000':77 '20':76 '402':235 'ACH API' 'Base network API' 'USDC API access' 'access':68,97 'ach':211,215 'across':113 'advertis':88 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,40,67,90 'attach':100 'autom':216 'avail':200 'base':7,24,56,78,163 'base-network' 'behind':48,204 'broader':109 'call':85 'caller':98 'categori':115 'challeng':236 'classif':130 'clear':217 'confirm':230 'connect':179 'convers':147 'data':9,26,116,120,222 'detail':186 'document':164,195 'embed':131 'endpoint':14,31,47,60,112,150,228 'estim':141 'exampl':198 'exchang':136 'export':121 'extrem':166 'feed':135 'financ':11,28,132 'four':114 'function':203 'gas':140 'gate':3,20,43 'generat':148 'geocod':145 'header':104 'host':111 'hous':218 'infrastructur':143 'insight':122 'instant':96 'key':91 'learn':125 'limit':94 'list':64 'live':231 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'marketplac':41 'metric':118 'micropay':53 'micropayment API' 'might':213 'network':57 'no-api-key' 'offer':8,25 'openapi':190 'page':174 'path':207 'pay-per-request API' 'payload':199 'payment':72,103,220 'payment-rel':219 'per':50,84,156 'per-request':49 'per-request-billing' 'platform':5,22,87,110 'post-endpoint' 'premium':66 'price':134,153 'prompt':181 'protocol':39 'quot':139 'rate':93,137 'relat':221 'render':176 'report':119 'request':51,107,157 'request/response':193 'requir':70 'schema':194 'segment':212 'sentiment':126 'settl':159 'simpli':99 'spars':167 'spec':191 'specif':59,202 'specul':226 'suggest':214 'summar':129 'technic':185 'text':128 'token':138 'unclear':209 'uniform':152 'unit':79 'usd':83 'usdc':52,81,161 'usdc-micropayment' 'util':13,30,144 'valid':146,234 'varieti':45 'via':160,232 'wallet':180 'web3':133 'x402':2,19,38,102 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"c9ec52d9-c041-463f-ba38-ce6921c70ad8","listingId":"40373a4d-e719-4f88-b235-7c432984f4bc","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:10.635Z"}],"sources":[{"listingId":"40373a4d-e719-4f88-b235-7c432984f4bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/193","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:10.635Z","lastSeenAt":"2026-04-27T12:34:23.846Z"}],"details":{"listingId":"40373a4d-e719-4f88-b235-7c432984f4bc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/193 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ach/193"},{"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/193"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or financial endpoints without managing API keys or subscriptions","Programmatic agent-driven API consumption with per-call USDC micropayments on Base","Integrating pay-as-you-go API calls into Web3 workflows"],"bestFor":["Developers or agents who want keyless, pay-per-call API access","Web3-native applications that can settle USDC on Base","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.068Z"},"updatedAt":"2026-04-27T12:34:23.846Z"}}