{"id":"e92c3839-a0a4-4bc5-aa51-2ec62833f1f9","shortId":"LxfQpa","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","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 is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/transactions/339` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The broader platform lists 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, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what request body this particular endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance","ai"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI spec or machine-readable schema available","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no content","The specific endpoint /api/v1/transactions/339 has no documented request body or response format","Purpose of 'Premium API Access' is unclear — no description beyond the title"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/339","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/339","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page lists pricing and endpoint categories. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific endpoint's purpose ('Premium API Access') is vague with no further detail 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'/api/v1/transactions/339':112 '/docs':185 '/pricing':187 '/readme':189 '/request':12,28 '0.02':11,27,63,141,177 '0x8335':135 '20000':130 '2913':136 '402':227 '402 payment api' '6':145 'accept':120 'access':105,118 'advertis':126 'ai/ml':51 'analysi':154 'analyt':50 'api':5,14,21,30,39,81,117 'attach':92 'avail':216 'base':8,24,71,131,138 'base network api' 'bodi':241 'broad':44 'broader':148 'call':4,20 'caller':90 'catalog':45 'challeng':125,232 'classif':157 'commit':89 'confirm':224 'connect':195 'content':220 'convers':169 'crawl':219 'data':49,54,171 'decim':146 'detail':202 'document':180,211,235 'embed':158 'enabl':38 'endpoint':47,59,107,110,151,222,244 'equal':140 'estim':166 'everi':58 'exampl':215 'exchang':161 'expect':245 'extrem':182 'feed':160 'finance/web3':53 'gas':165 'generat':172 'geocod':167 'given':142 'header':97 'infer':52 'infrastructur':56 'json-response' 'key':15,31,82 'limit':85 'list':114,150 'live':225 'low payment fee' 'lowpaymentfee.com':33 'maxamountrequir':128 'micropayment api' 'network':72 'no-api-key' 'offer':42 'openapi':206 'page':190 'paid':66 'particular':243 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-request' 'payment':76,96,102 'per':3,19,64 'platform':6,22,40,149 'point':179 'post':121 'post-endpoint' 'premium':116 'price':61,159,178 'prompt':197 'proof':103 'protocol':77 'quot':164 'rate':84,162 'render':192 'request':65,122,240 'request/response':209 'requir':16,32 'respons':248 'return':226,250 'schema':210 'sentiment':153 'simpli':91 'span':48 'spars':183 'spec':207 'specif':109 'subscript':88 'summar':156 'technic':201 'text':155 'token':163 'unclear':238 'unit':132 'usag':214 'usdc':68,134,143 'usdc api' 'usdc-base' 'util':57 'valid':100,168,230 'via':9,25,73 'wallet':196 'without':234 'x':95 'x-payment':94 'x402':10,26,37,75,101,124,231 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"e5868898-958e-49b1-a40b-614fbe3ca115","listingId":"e92c3839-a0a4-4bc5-aa51-2ec62833f1f9","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/339","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:06.512Z"}],"sources":[{"listingId":"e92c3839-a0a4-4bc5-aa51-2ec62833f1f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/339","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:06.512Z","lastSeenAt":"2026-04-22T10:32:21.441Z"}],"details":{"listingId":"e92c3839-a0a4-4bc5-aa51-2ec62833f1f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/339 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/339"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Pay-as-you-go access to analytics, AI inference, or financial data endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible agents that can settle USDC on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.841Z"},"updatedAt":"2026-04-22T10:32:21.441Z"}}