{"id":"3cf8987a-f7c5-4309-bdad-481d2ab2e4f9","shortId":"cXHyX9","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 collection 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 commitments required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/transfers/157` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns `application/json`. The platform advertises additional endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation).\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 usage examples available from the crawled material. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what input this particular `/transfers/157` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto API gateway"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) contain no usable content — only a 'Connect wallet' prompt.","No OpenAPI or schema documentation is available; request and response formats for /api/v1/transfers/157 are unknown.","The purpose and behavior of the /transfers/157 endpoint specifically is undocumented; the 'Premium API Access' label is generic.","The broader platform lists many endpoints but none have documented input/output schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/157","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific /transfers/157 endpoint is unclear beyond its generic 'Premium API Access' 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'/api/v1/transfers/157':106 '/docs':191 '/pricing':193 '/readme':195 '/request':13,28 '/transfers/157':243 '0.02':12,27,59,133 '000':122 '0x8335':127 '20':121 '2913':128 '402':230 '6':137 'Base network API' 'USDC API' 'accept':141 'access':112 'across':152 'addit':150 'advertis':149 'ai':161 'ai/ml':49 'analysi':165 'analyt':48,156 'api':5,20,37,71,111 'application/json':146 'attach':87 'avail':221 'base':8,23,67,123,130 'broad':42 'call':4,19 'caller':86 'categori':154 'challeng':117,231 'classif':168 'collect':43 'commit':78 'confirm':232 'connect':201 'content':207 'convers':184 'cost':58 'crawl':224 'crypto API gateway' 'data':47,52,155 'decim':138 'document':186,216,235 'embed':169 'enabl':36 'endpoint':45,57,104,140,151,227,244 'equal':132 'estim':179 'everi':56 'exampl':220 'exchang':174 'expect':245 'export':159 'extrem':188 'feed':173 'financ':170 'finance/web3':51 'four':153 'gas':178 'generat':185 'geocod':182 'given':134 'handl':83 'header':90 'http':93 'immedi':99 'infer':50 'infrastructur':181 'inlin':85 'input':240 'insight':160 'json-api' 'key':72 'learn':163 'limit':75 'list':108 'live':229 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':162 'materi':225 'metric':157 'micropayment API' 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':211 'page':196 'paid':62 'particular':242 'pay':2,17 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request' 'payment':84,89 'per':3,18,60 'platform':6,21,38,148 'post':142 'post-method' 'premium':110 'price':172 'prompt':203 'protocol':82 'quot':177 'rate':74,175 'receiv':96 'render':198 'report':158 'request':61,94,118,143 'request/response':214 'requir':79 'respons':98 'return':114,145,249 'schema':215 'sentiment':164 'servic':55 'settlement':101 'span':46 'spars':189 'spec':212 'specif':103 'summar':167 'text':166 'token':176 'unclear':238 'unit':124 'upon':100 'usag':219 'usdc':15,30,64,126,135 'usdc-base' 'util':54 'valid':183 'via':10,25 'wallet':202 'web3':171 'without':234 'x402':11,26,35,81,116 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"4eaf2999-a901-4f76-86fc-f83b8645c154","listingId":"3cf8987a-f7c5-4309-bdad-481d2ab2e4f9","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:32.526Z"}],"sources":[{"listingId":"3cf8987a-f7c5-4309-bdad-481d2ab2e4f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/157","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:32.526Z","lastSeenAt":"2026-04-22T16:32:16.685Z"}],"details":{"listingId":"3cf8987a-f7c5-4309-bdad-481d2ab2e4f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/157 \\\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 an x402 challenge requesting maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/157"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/157"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reports on a per-request payment basis without API key management","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) with per-call USDC payments","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Using utility services like geocoding, validation, and data conversion via micropayments"],"bestFor":["Developers who want instant API access without signup or subscription","Agent-based workflows that can attach x402 payment headers automatically","Low-volume or bursty usage patterns where pay-per-call is more economical than a subscription"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.807Z"},"updatedAt":"2026-04-22T16:32:16.685Z"}}