{"id":"86969e47-eb83-4bab-9db4-41a0f9be532e","shortId":"kmpdRg","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a Stripe invoice resource (`/api/v1/stripe/invoices/166`) behind an x402 payment challenge. When called without payment, it returns a 402 with an x402 v1 challenge requiring USDC on the Base network. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe parent site lowpaymentfee.com advertises a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, 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 with no API keys, no rate limits, and no commitments — payment is handled entirely via the x402 protocol settling in USDC on Base.\n\nThis specific endpoint appears to serve Stripe invoice data (invoice ID 166). However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the invoice endpoint returns or what POST body it expects. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to assess the actual utility or output format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoice-data","pay-per-call"],"categories":["finance","payments"],"synonyms":["stripe invoice API","x402 invoice endpoint","USDC pay-per-call","lowpaymentfee","crypto-gated API","Base network API","micropayment API"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided; request body format and response structure are unknown","This specific endpoint (/api/v1/stripe/invoices/166) is not listed on the site's main catalog — it may be an internal or unlisted resource","The endpoint's actual functionality (what invoice data it returns) cannot be verified from available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/166","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/166","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 via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The actual data returned by this invoice endpoint is 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'0.02':78,126 '000':69 '166':163 '20':68 '402':51,217 '6':74 'Base network API' 'USDC pay-per-call' 'actual':231 'advertis':85 'ai/ml':98 'amount':65 'analysi':100 'analyt':97 'api':94,131,171 'appear':155 'assess':229 'base':8,22,61,70,151 'base-network' 'behind':39 'bodi':209 'broad':87 'call':12,26,45,93 'captur':219 'catalog':88 'challeng':43,56,218 'classif':102 'commit':138 'confirm':215 'connect':180 'convers':119 'crypto-gated API' 'data':96,160 'decim':75 'descript':198 'detail':187 'difficult':227 'doc':170 'document':165,224 'embed':103 'endpoint':6,20,30,122,154,204,213 'entir':142 'equal':77 'estim':113 'exampl':195 'exchang':108 'expect':211 'expos':33 'extrem':167 'feed':107 'field':201 'financ':104 'format':235 'gas':112 'gate':3,17 'generat':120 'geocod':117 'handl':141 'howev':164 'id':162 'infrastructur':115 'invoic':5,19,36,159,161,203 'key':132 'lack':222 'limit':135 'list':124 'live':216 'lowpaymentfee' 'lowpaymentfee.com':32,84 'make':225 'maximum':64 'micropayment API' 'network':62 'openapi':191 'output':234 'page':175 'parent':82 'pay':10,24,91 'pay-per-cal':9,23,90 'pay-per-call' 'payment':42,47,139 'per':11,25,79,92,127 'post':208 'price':106,172 'prompt':182 'protocol':146 'quot':111 'rate':109,134 'readm':174 'render':177 'request':80,128 'request/response':194 'requir':57,66 'resourc':37 'return':49,205 'schema':192 'sentiment':99 'serv':157 'settl':147 'site':83 'span':95 'spars':168 'specif':153 'stripe':4,18,35,158 'stripe invoice API' 'stripe-invoice-data' 'summar':101 'technic':186 'token':110 'unit':71 'usdc':14,28,58,73,149 'usdc-settlement' 'util':116,232 'v1':55 'valid':118 'via':143 'wallet':181 'web3':105 'without':46 'x402':2,16,41,54,145 'x402 invoice endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2bca2c1e-d1e3-4c32-9777-6ce194043be6","listingId":"86969e47-eb83-4bab-9db4-41a0f9be532e","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:36.043Z"}],"sources":[{"listingId":"86969e47-eb83-4bab-9db4-41a0f9be532e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:36.043Z","lastSeenAt":"2026-04-22T21:31:28.695Z"}],"details":{"listingId":"86969e47-eb83-4bab-9db4-41a0f9be532e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/166\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 v1 challenge requiring USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/166"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/166"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving Stripe invoice details programmatically via crypto micropayment","Agents that need to fetch invoice data without API key registration","Automated billing workflows that settle per-request in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-call access to Stripe invoice data","AI agents with USDC on Base that need invoice information","Prototyping x402-based payment flows"],"notFor":["Production use requiring documented request/response schemas","Bulk invoice retrieval where per-call pricing is inefficient","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.056Z"},"updatedAt":"2026-04-22T21:31:28.695Z"}}