{"id":"60650842-1bf6-494e-a684-8e8875d950db","shortId":"6jESwb","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments required.\n\nThe specific endpoint at `/api/v1/messages/2` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST requests and returns `application/json`. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including 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. However, no OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation on what request body this particular endpoint expects or what it returns, integration requires experimentation or out-of-band knowledge.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","no-api-key","http-post"],"categories":["general","api-platform"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected request body for /api/v1/messages/2 are undocumented","All non-root pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","The endpoint name 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/2","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/2","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). However, there is no OpenAPI schema, no request/response documentation, no examples, and the purpose of the specific `/api/v1/messages/2` endpoint is entirely opaque beyond the generic label 'Premium API Access.' The crawled docs pages were 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'/api/v1/messages/2':96 '/pricing':202 '/readme':204 '/request':18,36 '0.02':17,35,67,123,182 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':117 '20':111 '2913':118 '300':149 '402 payment api' '6':127 'accept':131 'access':102 'addit':156 'address':145 'advertis':106,155 'ai':11,29 'ai/ml':55 'analysi':160 'analyt':12,30,54 'api':5,23,43,82,101 'application/json':137 'band':238 'base':8,26,75,113,120 'base network api' 'bodi':222 'broad':48 'broader':153 'call':4,22 'chain':143 'challeng':105 'classif':163 'collect':49 'commit':90 'connect':210 'content':216 'convers':175 'cost':109 'cover':10,28 'crawl':199 'data':53,58 'decim':128 'detail':189 'document':191,218 'embed':164 'enabl':42 'endpoint':51,63,94,130,157,225 'equal':122 'estim':172 'everi':62 'exampl':194 'exchang':167 'expect':226 'experiment':233 'feed':166 'financ':13,31 'finance/web3':57 'found':196 'gas':171 'general':60 'generat':177 'geocod':173 'given':124 'howev':185 'http':132 'http-post' 'includ':158 'infer':56 'integr':231 'json-api' 'key':83 'knowledg':239 'limit':86 'list':98 'low payment fee' 'lowpaymentfee.com':37 'maximum':108 'micropayment api' 'network':76 'no-api-key' 'offer':46 'on-chain':141 'openapi':187 'out-of-band':235 'page':205 'particular':224 'pay':2,20 'pay per request api' 'pay-per-cal':1,19 'pay-per-call' 'payabl':70 'payment':138 'per':3,21,68 'platform':44,154 'point':184 'post':133 'premium':100 'price':65,165,183 'prompt':212 'protocol':80 'quot':170 'rate':85,168 'request':69,134,221 'request/response':190 'requir':91,232 'return':136,207,230 'schema':188 'second':150 'sentiment':159 'settl':140 'span':52 'specif':93 'substant':215 'suit':6,24 'summar':162 'text':161 'timeout':151 'token':169 'unit':114 'upfront':89 'usag':193 'usdc':9,27,72,116,125 'usdc api' 'usdc-base' 'util':15,33,61 'valid':174 'via':77 'wallet':211 'without':217 'x402':41,79,104 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"cbb9476d-5f01-456d-ad7f-af1ffb50e51e","listingId":"60650842-1bf6-494e-a684-8e8875d950db","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.589Z"}],"sources":[{"listingId":"60650842-1bf6-494e-a684-8e8875d950db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.589Z","lastSeenAt":"2026-04-22T02:32:07.324Z"}],"details":{"listingId":"60650842-1bf6-494e-a684-8e8875d950db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/2 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/2"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API calls where per-request crypto payment replaces traditional API key auth","Accessing a variety of utility, AI, and data endpoints without subscription commitments","Programmatic pay-as-you-go access to analytics, finance, and ML inference services"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","Users who prefer on-chain USDC micropayments over traditional billing","Quick prototyping where low per-call cost and no rate limits are valued"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up and bulk pricing is preferred"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.78Z"},"updatedAt":"2026-04-22T02:32:07.324Z"}}