{"id":"6f5280ae-eb0f-4680-931b-2b0cddc3823c","shortId":"nwyGAb","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 access to a variety of endpoints behind per-request USDC micropayments on the Base network. The platform advertises four categories of APIs: 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 listed at $0.02 per request.\n\nThe specific endpoint at `/api/v1/ach/186` is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02. Payment is made via the x402 exact scheme with no API keys or rate limits required. The payTo address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the timeout is 300 seconds.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no indication of what the `/api/v1/ach/186` endpoint actually returns. The endpoint path suggests it may relate to ACH (Automated Clearing House) payment processing, but this is speculative. Without documentation or example responses, it is unclear what data or functionality this endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["finance","data","llm","infrastructure"],"synonyms":["micropayment API","pay-per-call API","x402 API","USDC API","Base network API","lowpaymentfee","ACH API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for any endpoint","The specific endpoint path '/api/v1/ach/186' is not listed on the homepage; its purpose is unknown","The 'Premium API Access' label is generic and does not describe actual functionality","ACH in the path may imply regulated financial services — verify compliance before use"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/186","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/186","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 zero documentation on what /api/v1/ach/186 actually does or returns. No OpenAPI spec, no example requests/responses, and all doc pages are blank beyond a wallet connect prompt. The listing is effectively a 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'/api/v1/ach/186':113,204 '/docs':172 '/pricing':174 '/readme':176 '/request':17,34 '0.02':16,33,106,139 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':160 '0x8335':134 '20':128 '300':165 'ACH API' 'Base network API' 'USDC API' 'access':45,118 'ach':216 'actual':206 'address':158 'advertis':63 'ai':10,27,75 'analysi':79 'analyt':69 'api':4,21,41,67,117,150 'autom':217 'base':7,24,59,130,136 'base-network' 'behind':51 'categori':65 'challeng':124 'classif':82 'clear':218 'connect':182 'content':188 'convers':99 'data':9,26,68,72,235 'document':167,197,227 'embed':83 'endpoint':14,31,50,102,111,205,209,239 'equal':138 'estim':93 'exact':146 'exampl':229 'exchang':88 'export':73 'extrem':169 'feed':87 'financ':11,28,84 'four':64 'function':237 'gas':92 'gate':3,20,44 'generat':100 'geocod':97 'hous':219 'indic':200 'infrastructur':95 'insight':74 'key':151 'label':115 'learn':77 'limit':154 'list':104 'live':122 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':76 'made':142 'marketplac':42 'may':213 'metric':70 'micropay':56 'micropayment API' 'network':60 'no-api-key' 'offer':8,25 'openapi':192 'page':177 'path':210 'pay-per-call API' 'payment':140,220 'payto':157 'per':53,107 'per-request':52 'per-request-billing' 'platform':5,22,62 'post-endpoint' 'premium':116 'price':86 'process':221 'prompt':184 'protocol':40 'provid':240 'quot':91 'rate':89,153 'relat':214 'render':179 'report':71 'request':54,108,125 'request/response':195 'requir':155 'respons':230 'return':120,207 'schema':196 'scheme':147 'second':166 'sentiment':78 'spars':170 'spec':193 'specif':110 'specul':225 'suggest':211 'summar':81 'text':80 'timeout':163 'token':90 'unclear':233 'unit':131 'usdc':55,133 'usdc-micropayment' 'util':13,30,96 'valid':98 'varieti':48 'via':143 'wallet':183 'web3':85 'without':226 'x402':2,19,39,123,145 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"a1096f6d-937f-40ac-83e0-61611534a085","listingId":"6f5280ae-eb0f-4680-931b-2b0cddc3823c","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:11.224Z"}],"sources":[{"listingId":"6f5280ae-eb0f-4680-931b-2b0cddc3823c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/186","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:11.224Z","lastSeenAt":"2026-04-23T20:32:18.851Z"}],"details":{"listingId":"6f5280ae-eb0f-4680-931b-2b0cddc3823c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/186 \\\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 platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/ach/186 requests up to 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/ach/186"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics or AI inference endpoints with per-request crypto micropayments","Querying financial data (prices, exchange rates, gas estimates) without subscription commitments","Using utility services (geocoding, validation, conversion) on a pay-as-you-go basis"],"bestFor":["Developers who want keyless, pay-per-request API access via crypto","Agents or bots that need programmatic access to diverse utility endpoints settled on Base","Users who prefer micropayment models over monthly subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone requiring high-volume access where per-request pricing becomes expensive","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.067Z"},"updatedAt":"2026-04-23T20:32:18.851Z"}}