{"id":"7c6b1053-32d0-4725-811e-6e3e42bd51bc","shortId":"zxpbn3","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol-based API platform that provides pay-per-request access to a variety of endpoints across data analytics, AI/ML inference, finance/crypto, and infrastructure utilities. All endpoints are gated via the x402 payment protocol on the Base network, accepting USDC (USD Coin) payments. The specific endpoint at `/api/v1/stripe/invoices/93` is labeled \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals).\n\nThe platform advertises a simple pricing model: $0.02 per request with no API keys, no rate limits, no minimums, and instant access. Payment is settled on-chain via Base network USDC to the specified wallet address. The x402 challenge confirms the endpoint is live and accepts POST requests with JSON responses.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. The actual behavior and response format of this specific invoice endpoint is unknown beyond what the x402 challenge reveals.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","crypto payment gateway","invoice API","lowpaymentfee"],"warnings":["Documentation pages (docs, API, pricing, README) all return only 'Connect wallet' with no usable content","No request or response schema available — actual endpoint behavior is unknown","The endpoint path '/api/v1/stripe/invoices/93' suggests a specific resource (invoice #93) rather than a general-purpose API","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/93","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/stripe/invoices/93","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 via 402 challenge with clear pricing and network info, but there is no documentation, no schema for request/response bodies, and no examples. The actual functionality of this specific invoice endpoint is 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'/request':17,34 '0.02':16,33,97,116 '000':101 '20':100 '6':107 'Base network API' 'USDC micropayment API' 'accept':78,155 'access':50,92,130 'across':56 'actual':185 'addit':181 'address':145 'advertis':111 'ai':10,27 'ai/ml':59 'analyt':58 'api':4,21,42,91,121,167 'base':7,24,41,76,102,138 'behavior':186 'beyond':197 'chain':136 'challeng':148,201 'coin':81 'confirm':149 'connect':176 'content':183 'cost':94 'crypto payment gateway' 'data':9,26,57 'decim':108 'doc':166 'document':161 'endpoint':14,31,55,66,85,151,194 'extrem':163 'financ':11,28 'finance/crypto':61 'format':189 'gate':3,20,68 'infer':60 'infrastructur':63 'instant':129 'invoic':193 'invoice API' 'json':159 'json-response' 'key':122 'label':89 'limit':125 'live':153 'lowpaymentfee' 'lowpaymentfee.com':35 'minimum':127 'model':115 'network':77,139 'no-api-key' 'offer':8,25 'on-chain':134 'page':171 'pay':47 'pay-per-call API' 'pay-per-request':46 'payment':72,82,131 'per':48,98,117 'platform':5,22,43,110 'post':156 'post-method' 'premium':90 'price':114,168 'prompt':178 'protocol':40,73 'protocol-bas':39 'provid':45 'rate':124 'readm':170 'render':173 'request':49,99,118,157 'respons':160,188 'reveal':202 'settl':133 'simpl':113 'spars':164 'specif':84,192 'specifi':143 'technic':182 'unit':103 'unknown':196 'usd':80 'usdc':79,105,140 'usdc-base-network' 'util':13,30,64 'varieti':53 'via':69,137 'wallet':144,177 'x402':2,19,38,71,147,200 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"fdbe3d12-409d-48da-baf7-3d296b331e6d","listingId":"7c6b1053-32d0-4725-811e-6e3e42bd51bc","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/stripe/invoices/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:10.902Z"}],"sources":[{"listingId":"7c6b1053-32d0-4725-811e-6e3e42bd51bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:10.902Z","lastSeenAt":"2026-04-25T05:33:15.693Z"}],"details":{"listingId":"7c6b1053-32d0-4725-811e-6e3e42bd51bc","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/93 \\\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":"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":"Endpoint accepts USDC (USD Coin) on Base network with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/93"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/93"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled via on-chain USDC on Base","Programmatic invoice retrieval or generation via crypto-native payment"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","Agents or bots that can settle x402 payments on Base","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or SDKs before integrating","Applications requiring high-volume calls where per-request pricing is inefficient","Developers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.418Z"},"updatedAt":"2026-04-25T05:33:15.693Z"}}