{"id":"9bc5a6fc-9e6a-4d38-b27a-2d318eafebdd","shortId":"dJeT3S","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 commitments required. 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/359` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 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. However, documentation is extremely thin: 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 examples available. The actual behavior and data returned by this specific transactions endpoint is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The purpose and behavior of /api/v1/transactions/359 is completely undocumented — 'Premium API Access' is the only description","No request body schema or response schema is provided; integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/359","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/359","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does, no request/response schemas, no examples, and the docs pages are empty. The 'Premium API Access' label is generic and 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'/api/v1/transactions/359':107 '/docs':193 '/pricing':195 '/readme':197 '/request':13,28 '0.02':12,27,59,137,184 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':132 '20':125 '300':152 '402 payment API' '6':141 'Base network API' 'USDC micropayment API' 'accept':115 'access':113 'actual':225 'address':148 'advertis':121,158 'ai/ml':49 'analysi':162 'analyt':48 'api':5,20,37,71,112 'asset':131 'attach':87 'avail':223,239 'base':8,23,67,127,134 'behavior':226 'broad':42 'broader':156 'call':4,19 'caller':86 'catalog':43 'challeng':120 'classif':165 'commit':78 'connect':203 'convers':177 'cost':58 'crypto-paid API' 'data':47,52,228 'decim':142 'detail':210 'document':188,219 'embed':166 'enabl':36 'endpoint':45,57,105,159,234 'equal':136 'estim':174 'everi':56 'exampl':222 'exchang':169 'extrem':190 'feed':168 'finance/web3':51 'gas':173 'generat':179 'geocod':175 'given':138 'handl':83 'header':97 'howev':187 'immedi':102 'infer':50 'inlin':85 'json-response' 'key':72 'limit':75 'list':109 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':240 'maxamountrequir':123 'network':9,24,68 'no-api-key' 'offer':40 'openapi':214 'page':198 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,91,96,144 'per':3,18,60 'platform':6,21,38,157 'point':186 'post':116 'post-endpoint' 'premium':111 'price':167,185 'prompt':205 'protocol':82 'quot':172 'rate':74,170 'receiv':99 'render':200 'request':61,117 'request/response':217 'requir':79 'respons':101 'return':229 'schema':218 'second':153 'sent':146 'sentiment':161 'servic':55 'sign':89 'span':46 'spec':215 'specif':104,232 'summar':164 'technic':209 'text':163 'thin':191 'timeout':154 'token':171 'transact':233 'unit':128 'unknown':236 'usdc':15,30,64,90,130,139 'usdc-base-network' 'util':54 'valid':176 'via':10,25 'wallet':204 'x':95 'x-payment':94 'x402':11,26,35,81,119 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"655318eb-7239-4d54-9566-5f0506f33e56","listingId":"9bc5a6fc-9e6a-4d38-b27a-2d318eafebdd","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/359","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:21.671Z"}],"sources":[{"listingId":"9bc5a6fc-9e6a-4d38-b27a-2d318eafebdd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/359","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:21.671Z","lastSeenAt":"2026-04-23T11:31:27.782Z"}],"details":{"listingId":"9bc5a6fc-9e6a-4d38-b27a-2d318eafebdd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/359 \\\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":"The 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":"The x402 challenge for this endpoint shows maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/359"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/359"},{"claim":"Documentation pages /docs, /api, /pricing, /README all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to transaction or financial data without subscription commitments"],"bestFor":["Developers who want zero-signup, pay-per-call API access","AI agents with x402-compatible payment capabilities","Users already holding USDC on Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments","Developers without USDC on Base network or x402 client libraries"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.144Z"},"updatedAt":"2026-04-23T11:31:27.782Z"}}