{"id":"967172c5-a806-45e9-bb1b-fa380a26f4d8","shortId":"wdrjhv","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/190` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. The broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is minimal: the landing page lists available endpoints with short labels and prices, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. Because of this, the actual input parameters and response shapes for `/api/v1/messages/190` (and the other endpoints) are unknown and must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","http-post","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base usdc api","lowpaymentfee"],"warnings":["No OpenAPI spec or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/messages/190 is unknown","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","Request and response formats must be discovered experimentally"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/190","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/messages/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond endpoint names, and the purpose of /api/v1/messages/190 specifically is entirely opaque. This is effectively a stub 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'/api/v1/messages/190':106,238 '/pricing':211 '/readme':213 '/request':19,38 '0.02':18,37,70,134,178 '000':122 '0x8335':128 '20':121 '2913':129 '6':138 'accept':142 'access':112 'actual':231 'addit':225 'advertis':116 'ai':12,31,57 'also':151 'analysi':156 'analyt':56 'api':5,24,45,83,111 'application/json':147 'asset':127 'attach':94 'avail':188 'bare':219 'base':8,27,78,123,131 'base usdc api' 'broad':50 'broader':149 'call':4,23 'caller':92 'challeng':115 'classif':159 'collect':51 'commit':91 'connect':220 'content':226 'convers':171 'cost':119 'cover':10,29 'data':11,30,55 'decim':139 'discov':248 'document':181,204 'embed':160 'enabl':44 'endpoint':16,35,53,66,104,141,153,189,242 'equal':133 'estim':168 'everi':65 'exampl':208 'exchang':163 'experiment':249 'expos':152 'feed':162 'financ':13,32,60 'gas':167 'generat':173 'geocod':169 'given':135 'header':98 'http':143 'http-post' 'infrastructur':63 'input':232 'json-api' 'key':84 'label':192 'land':185 'learn':59 'limit':87 'list':108,187 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'maximum':118 'micropayment api' 'minim':183 'minimum':90 'must':246 'network':79 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':199 'page':186,214 'paramet':233 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':97 'per':3,22,71 'platform':46,150 'point':180 'post':144 'premium':110 'price':68,161,179,194 'prompt':222 'quot':166 'rate':86,164 'request':72,101 'request/response':202 'resolv':216 'respons':235 'return':146 'schema':203 'sentiment':155 'settl':73 'shape':236 'short':191 'simpli':93 'span':54 'spec':200 'specif':103 'suit':6,25 'summar':158 'text':157 'token':165 'unit':124 'unknown':244 'usag':207 'usdc':9,28,75,126,136 'usdc-base' 'util':15,34,64 'valid':170 'wallet':221 'web3':61 'x402':43,96,114 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"cb691614-fbcd-4e7f-a4dc-229ab884be85","listingId":"967172c5-a806-45e9-bb1b-fa380a26f4d8","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/messages/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.490Z"}],"sources":[{"listingId":"967172c5-a806-45e9-bb1b-fa380a26f4d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/190","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.490Z","lastSeenAt":"2026-04-22T02:32:07.122Z"}],"details":{"listingId":"967172c5-a806-45e9-bb1b-fa380a26f4d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/190 \\\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 platform lists endpoints across data, AI, finance, and utility categories all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/190"}],"useCases":["Accessing miscellaneous API services with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Experimenting with x402 payment protocol integrations"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents that need instant, keyless API access settled in USDC on Base","Low-volume or sporadic API consumers who want no subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-throughput production workloads where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.975Z"},"updatedAt":"2026-04-22T02:32:07.122Z"}}