{"id":"10e72a11-3ded-4ec2-8186-edb74593acbd","shortId":"JQCyqL","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach a signed USDC payment in the X-PAYMENT header and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transfers/173` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. Beyond this particular path, the platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, 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 example payloads available. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what request body `/api/v1/transfers/173` expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment protocol"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found for any endpoint.","The purpose and expected request/response format of /api/v1/transfers/173 is undocumented and unclear.","The platform lists many endpoint categories (AI, finance, analytics, utils) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/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/transfers/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific purpose of /api/v1/transfers/173 ('Premium API Access') is entirely opaque. This is effectively a stub 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'/api/v1/transfers/173':107,238 '/docs':189 '/pricing':190 '/readme':193 '/request':13,28 '0.02':12,27,59,134,181 '000':122 '0x8335':128 '20':121 '2913':129 '402':227 '402 payment protocol' '6':138 'Base network API' 'USDC micropayment API' 'accept':142 'access':113 'advertis':117,154 'ai/ml':49 'analysi':158 'analyt':48 'api':5,20,37,71,112 'application/json':147 'asset':127 'attach':87 'avail':219 'base':8,23,67,123,131 'beyond':148 'bodi':237 'broad':42 'call':4,19 'caller':86 'catalog':43 'challeng':116,228 'classif':161 'commit':79 'connect':199 'content':205 'convers':173 'cost':58 'crypto-paid API' 'data':47,52,175 'decim':139 'document':184,214,231 'embed':162 'enabl':36 'endpoint':45,57,105,141,155,221 'equal':133 'estim':170 'everi':56 'exampl':217 'exchang':165 'expect':239 'extrem':186 'feed':164 'finance/web3':51 'gas':169 'generat':176 'geocod':171 'given':135 'handl':83 'header':97 'immedi':102 'infer':50 'inlin':85 'json-api' 'key':72 'limit':75 'list':109 'live':223 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':119 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':209 'page':194 'paid':62 'particular':150 'path':151 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':218 'payment':84,91,96 'per':3,18,60 'platform':6,21,38,153 'point':183 'post':143 'post-method' 'premium':111 'price':163,182 'prompt':201 'proper':226 'protocol':82 'quot':168 'rate':74,166 'receiv':99 'render':196 'request':61,144,236 'request/response':212 'respons':101 'return':146,224,243 'schema':213 'sentiment':157 'servic':55 'sign':89 'span':46 'spars':187 'spec':210 'specif':104 'summar':160 'text':159 'token':167 'unclear':234 'unit':124 'upfront':78 'usdc':15,30,64,90,126,136 'usdc-base-network' 'util':54 'valid':172 'via':10,25 'wallet':200 'without':230 'x':95 'x-payment':94 'x402':11,26,35,81,115 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"fbdd24f0-5e63-44e6-a1aa-f6da66260b5d","listingId":"10e72a11-3ded-4ec2-8186-edb74593acbd","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/transfers/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":"2026-04-18T19:27:34.987Z"}],"sources":[{"listingId":"10e72a11-3ded-4ec2-8186-edb74593acbd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/173","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:34.987Z","lastSeenAt":"2026-04-23T02:01:53.068Z"}],"details":{"listingId":"10e72a11-3ded-4ec2-8186-edb74593acbd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/173 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/173"},{"claim":"All endpoints cost $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"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-as-you-go endpoints into autonomous agent workflows","Prototyping applications that need analytics, AI, or finance data without subscription overhead"],"bestFor":["Developers who want zero-signup, pay-per-use API access","AI agents with Base network USDC wallets needing on-demand data","Projects that prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Teams without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.679Z"},"updatedAt":"2026-04-23T02:01:53.068Z"}}