{"id":"d3d2337d-16cd-46ca-9f02-931c47b80879","shortId":"TDx2WL","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/charges/162` is labeled \"Premium API Access\" and accepts POST requests, returning JSON responses. Payment is settled on-chain to a specified wallet address using USDC (contract 0x8335…2913 on Base), with a maximum charge of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. The platform emphasizes no API keys, no rate limits, no minimums, and instant access.\n\nHowever, the specific endpoint `/api/v1/charges/162` does not clearly map to any of the listed API categories — it sits under a `/charges/` path that isn't documented on the site. There is no OpenAPI schema, no detailed documentation (the /docs, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content), and no example request/response payloads are available. The endpoint is confirmed live via a valid 402 challenge, but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key-required"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The /charges/162 path does not correspond to any documented API endpoint on the site","No OpenAPI schema or detailed documentation available — /docs, /pricing, and /README pages are empty","No example request or response payloads are available; what the endpoint returns upon payment is unknown","The platform lists many API categories but provides no technical details for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/162","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/charges/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific /charges/162 path is not explained anywhere. The docs/pricing/README pages are all empty. This is effectively a stub 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'/charges':187 '/docs':205 '/pricing':206 '/readme':208 '/request':13,28 '0.02':12,27,98,150 '000':94 '0x8335':84 '20':93 '2913':85 '402':236 '6':102 'Base network API' 'USDC micropayment API' 'accept':46,64 'access':62,166 'actual':241 'address':80 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,109,157,181 'avail':227 'base':8,23,51,87,95 'broader':105 'call':4,19 'categori':110,182 'chain':75 'challeng':237 'charg':91 'classif':126 'clear':174 'confirm':231 'connect':214 'content':220 'contract':83 'convers':143 'crypto-paid API' 'data':112,116 'decim':103 'detail':202 'document':192,203 'embed':127 'emphas':155 'endpoint':55,146,170,229 'estim':137 'exampl':223 'exchang':132 'export':117 'feed':131 'financ':128 'gas':136 'generat':144 'geocod':141 'given':99 'howev':167 'i.e':97 'includ':111 'infrastructur':139 'insight':118 'instant':165 'isn':190 'json':68 'json-response' 'key':158 'label':59 'learn':121 'limit':161 'list':148,180 'live':232 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'map':175 'maximum':90 'metric':114 'minimum':163 'multipl':108 'network':9,24,52 'no-api-key-required' 'on-chain':73 'openapi':199 'page':209 'path':188 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':225 'payment':48,70,245 'per':3,18,36,151 'platform':6,21,39,106,154 'post':65 'premium':60 'premium API access' 'price':130 'prompt':216 'protocol':44 'quot':135 'rate':133,160 'report':115 'request':37,66,152 'request/response':224 'respons':69 'return':67,211,242 'schema':200 'sentiment':122 'settl':72 'sit':184 'site':195 'specif':54,169 'specifi':78 'substant':219 'success':244 'summar':125 'text':124 'token':134 'unit':96 'unknown':247 'upon':243 'usdc':15,30,47,82,100 'usdc-base-network' 'use':41,81 'util':140 'valid':142,235 'via':10,25,233 'wallet':79,215 'web3':129 'x402':11,26,43 'x402 API' 'x402-payment'","prices":[{"id":"e4346c28-8b6c-4358-af7f-befb7a52f800","listingId":"d3d2337d-16cd-46ca-9f02-931c47b80879","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/charges/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:17.039Z"}],"sources":[{"listingId":"d3d2337d-16cd-46ca-9f02-931c47b80879","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/162","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:17.039Z","lastSeenAt":"2026-04-24T00:31:54.999Z"}],"details":{"listingId":"d3d2337d-16cd-46ca-9f02-931c47b80879","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl (you need an x402-compatible client to generate the header):\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/162 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/charges/162"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/162"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages contain only a 'Connect wallet' prompt with no substantive content","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","Testing x402 protocol integrations with low-cost endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Users who want per-call pricing without subscriptions or rate limits"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without a Base-network USDC wallet","High-volume use cases where $0.02/request adds up quickly without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.85Z"},"updatedAt":"2026-04-24T00:31:54.999Z"}}