{"id":"fd8718f8-2423-4eb6-a145-12e6aaff435c","shortId":"J2nZxE","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 payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/transactions/74` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. 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 data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown. Without OpenAPI specs or usage examples, callers will need to experiment to discover input formats and response structures.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto API gateway"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no content","The specific endpoint /api/v1/transactions/74 is not listed on the landing page catalog; its purpose is unclear","No examples or error handling documentation provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/74","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond the landing page, no request/response schemas, and no usage examples. The specific endpoint path '/api/v1/transactions/74' has no description beyond 'Premium API Access', making it unclear what it actually does. All doc/pricing/README pages are empty 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'/request':13,28 '0.02':12,27,59,139,186 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':133 '20':127 '2913':134 '300':153 '6':143 'Base network API' 'USDC micropayment API' 'accept':114 'access':112 'actual':208 'address':149 'advertis':159 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':163 'analyt':48 'api':5,20,37,71,111 'attach':87 'base':8,23,67,129,136 'beyond':191 'broad':42 'broader':157 'call':4,19 'caller':86,222 'catalog':43 'challeng':119 'classif':166 'commit':78 'confirm':120 'connect':204 'convers':178 'conversion' 'cost':58 'crypto API gateway' 'crypto-gas-estimates' 'data':47,52,180 'data-analytics' 'decim':144 'discov':228 'document':190 'embed':167 'empti':197 'enabl':36 'endpoint':45,57,104,160,213 'equal':138 'essenti':196 'estim':175 'everi':56 'exampl':221 'exchang':170 'exchange-rates' 'experi':226 'feed':169 'finance-price-feeds' 'finance/web3':51 'format':230 'gas':174 'generat':181 'geocod':176 'geocoding' 'given':140 'handl':83 'header':90 'howev':189 'http':93 'immedi':99 'individu':212 'infer':50 'inlin':85 'input':229 'key':72 'land':193 'limit':75 'list':108 'live':123 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'need':224 'network':9,24,68 'offer':40 'openapi':217 'page':194,201 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,89,145 'per':3,18,60 'platform':6,21,38,158 'point':188 'post':115 'premium':110 'price':168,187 'protocol':82 'quot':173 'rate':74,171 'receiv':96 'request':61,94,116,124 'request/response':209 'requir':79 'respons':98,232 'schema':210 'second':154 'sent':147 'sentiment':162 'servic':55 'settlement':101 'show':203 'span':46 'spec':218 'specif':103 'structur':233 'sub':200 'sub-pag':199 'summar':165 'text':164 'timeout':155 'token':172 'unit':130 'unknown':215 'upon':100 'usag':220 'usdc':15,30,64,132,141 'usdc-base' 'util':54 'valid':177 'validation' 'via':10,25 'wallet':205 'without':216 'x402':11,26,35,81,118 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"9f878c3f-1cca-407d-ac77-9aa1693e788d","listingId":"fd8718f8-2423-4eb6-a145-12e6aaff435c","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:14.303Z"}],"sources":[{"listingId":"fd8718f8-2423-4eb6-a145-12e6aaff435c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:14.303Z","lastSeenAt":"2026-04-22T16:32:15.453Z"}],"details":{"listingId":"fd8718f8-2423-4eb6-a145-12e6aaff435c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/74 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform charges $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 confirms USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/74"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval with inline USDC micropayments","On-demand AI inference (sentiment, summarization, classification) without API keys","Fetching real-time crypto price feeds and gas estimates","Geocoding and data conversion utilities paid per call"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation and OpenAPI schemas before integrating","High-throughput batch workloads where per-request pricing adds up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.635Z"},"updatedAt":"2026-04-22T16:32:15.453Z"}}