{"id":"8c761534-9d06-44e6-9191-1434140c8ad3","shortId":"tx6ZGs","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com exposes a Stripe invoice resource (`/api/v1/stripe/invoices/170`) behind an x402 payment wall. It is part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint listed here returns a Stripe invoice (ID 170) as JSON. Payment is handled via the x402 protocol: callers receive a 402 challenge specifying the USDC asset on Base (`0x8335…2913`), a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals), and a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through on-chain micropayment.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the invoice object contains or what POST body (if any) is expected. The platform appears to be a demonstration or early-stage deployment of x402-gated APIs rather than a mature production service.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","pay-per-request","no-api-key","micropayment"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","402 payment required API","crypto-gated endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response fields","The endpoint targets a specific invoice ID (170); unclear if this is parameterized or a fixed demo resource","Platform appears to be early-stage or a demo; reliability and longevity are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/170","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/170","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The specific resource (Stripe invoice 170) is opaque with no field descriptions or usage 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'0.02':10,24,73,126 '000':122 '0x8335':115 '170':94 '20':121 '2913':116 '300':134 '402':107 '402 payment required API' '6':130 'Base network API' 'USDC pay-per-call' 'access':145 'advertis':144 'ai/ml':63 'amount':119 'analyt':62 'api':59,138,163,221 'appear':207 'asset':112 'base':8,22,82,114,123 'behind':39 'bodi':200 'broader':49 'call':58 'caller':104 'chain':152 'challeng':108 'connect':172 'contain':196 'content':178 'crypto-gated endpoint' 'data':61,66 'decim':131 'demonstr':211 'deploy':216 'descript':189 'doc':162 'document':154 'dozen':53 'earli':214 'early-stag':213 'endpoint':6,20,30,86 'exampl':186 'expect':204 'expos':33 'extrem':159 'field':192 'finance/web3':65 'gate':3,17,220 'given':127 'grant':147 'handl':99 'i.e':125 'id':93 'infer':64 'invoic':5,19,36,92,194 'json':96 'key':139 'limit':142 'list':87 'lowpaymentfee' 'lowpaymentfee.com':32 'matur':225 'maximum':118 'micropay':153 'micropayment' 'network':83 'no-api-key' 'object':195 'offer':52 'on-chain':150 'openapi':182 'page':167 'part':46 'pay':9,23,56 'pay-per-cal':55 'pay-per-request' 'payment':42,97 'per':13,27,57,74 'platform':50,206 'post':199 'price':71,164 'product':226 'prompt':174 'protocol':103 'pure':148 'rate':141 'rather':222 'readm':166 'receiv':105 'render':169 'request':14,28,75 'request/response':185 'resourc':37 'return':89 'schema':183 'second':135 'servic':69,227 'settl':77 'site':157 'span':60 'specif':85 'specifi':109 'stage':215 'stripe':4,18,35,91 'stripe invoice API' 'stripe-invoice' 'thin':160 'timeout':136 'unit':124 'usdc':12,26,79,111,128 'usdc-base' 'util':68 'via':100 'wall':43 'wallet':173 'x402':2,16,41,102,219 'x402 micropayment' 'x402-gated':1,15,218 'x402-payment'","prices":[{"id":"a9df6f9c-e051-4485-9b98-dfbf3401dad5","listingId":"8c761534-9d06-44e6-9191-1434140c8ad3","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/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:46.239Z"}],"sources":[{"listingId":"8c761534-9d06-44e6-9191-1434140c8ad3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/170","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:46.239Z","lastSeenAt":"2026-04-25T11:32:47.199Z"}],"details":{"listingId":"8c761534-9d06-44e6-9191-1434140c8ad3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/170 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/170"},{"claim":"All APIs on the platform are 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":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/170"}],"useCases":["Retrieving Stripe invoice data via a single micropayment without needing an API key","Demonstrating x402 protocol integration for pay-per-call APIs","Programmatic invoice lookup settled in USDC on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC micropayments on Base","Use cases requiring keyless, per-request API access"],"notFor":["Production billing workflows requiring documented, stable Stripe integrations","Users who need detailed API documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.604Z"},"updatedAt":"2026-04-25T11:32:47.199Z"}}