{"id":"84e88d54-bbae-4e58-915e-e88e57f36224","shortId":"95tSTp","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 infrastructure utilities. 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/transactions/282` is listed as \"Premium API Access\" and returns `application/json`. 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 is discoverable. The broader platform advertises additional 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 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 usage examples available from the crawl. The actual functionality behind \"Premium API Access\" at this specific transaction endpoint is unclear — the name and path (`/transactions/282`) do not reveal what data or service is returned.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/transactions/282 ('Premium API Access') is undefined — the path and title give no indication of what data is returned","The broader platform lists many endpoints (AI, finance, analytics, utils) but none have documented request/response formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/282","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/transactions/282","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this specific endpoint actually returns. No OpenAPI spec, no request/response schemas, and all doc pages render only 'Connect wallet'. The purpose of '/api/v1/transactions/282' is 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'/api/v1/transactions/282':107 '/docs':189 '/pricing':190 '/readme':193 '/request':13,28 '/transactions/282':241 '0.02':12,27,59,137,181 '000':125 '0x8335':131 '20':124 '2913':132 '402 payment API' '6':141 'Base network API' 'USDC micropayment API' 'accept':145 'access':113,229 'actual':224 'addit':155 'advertis':120,154 'ai/ml':49 'analysi':159 'analyt':48 'api':5,20,37,71,112,228 'application/json':116 'asset':130 'attach':87 'avail':219 'base':8,23,67,126,134 'behind':226 'broad':42 'broader':152 'call':4,19 'caller':86 'catalog':43 'challeng':119 'classif':162 'commit':79 'connect':199 'content':205 'convers':174 'cost':58 'crawl':222 'crypto-paid API' 'data':47,52,246 'decim':142 'discover':150 'document':184,214 'embed':163 'enabl':36 'endpoint':45,57,105,144,156,234 'equal':136 'estim':171 'everi':56 'exampl':218 'exchang':166 'extrem':186 'feed':165 'finance/web3':51 'function':225 'gas':170 'generat':176 'geocod':172 'given':138 'handl':83 'header':97 'immedi':102 'infer':50 'infrastructur':54 'inlin':85 'json-api' 'key':72 'limit':75 'list':109 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':122 'name':238 'network':9,24,68 'no-api-key' 'offer':40 'openapi':209 'page':194 'paid':62 'path':240 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,91,96 'per':3,18,60 'platform':6,21,38,153 'point':183 'post':146 'post-method' 'premium':111,227 'price':164,182 'prompt':201 'protocol':82 'quot':169 'rate':74,167 'receiv':99 'render':196 'request':61,147 'request/response':212 'respons':101 'return':115,250 'reveal':244 'schema':213 'sentiment':158 'servic':248 'sign':89 'span':46 'spars':187 'spec':210 'specif':104,232 'summar':161 'text':160 'token':168 'transact':233 'unclear':236 'unit':127 'upfront':78 'usag':217 'usdc':15,30,64,90,129,139 'usdc-base-network' 'util':55 'valid':173 'via':10,25 'wallet':200 'x':95 'x-payment':94 'x402':11,26,35,81,118 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ab11703f-7180-44b1-99e5-dc02145770ec","listingId":"84e88d54-bbae-4e58-915e-e88e57f36224","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/transactions/282","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:49.545Z"}],"sources":[{"listingId":"84e88d54-bbae-4e58-915e-e88e57f36224","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/282","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:49.545Z","lastSeenAt":"2026-04-23T15:01:48.314Z"}],"details":{"listingId":"84e88d54-bbae-4e58-915e-e88e57f36224","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/282 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/282"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without creating accounts or managing API keys","Making one-off paid API calls from autonomous agents using x402 protocol","Paying for API access with USDC on Base L2 for low transaction fees"],"bestFor":["Agents or scripts that need keyless, pay-as-you-go API access","Developers who prefer crypto micropayments over subscription billing","x402-compatible clients on the Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers who cannot transact in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.663Z"},"updatedAt":"2026-04-23T15:01:48.314Z"}}