{"id":"dfd4ba3f-1306-4fc8-b3b2-18600aae22fa","shortId":"XEhUjv","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 159) behind an x402 payment wall. The endpoint accepts POST requests and returns application/json responses. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (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 minimums or commitments. However, this specific listing is for the Stripe invoices endpoint at path /api/v1/stripe/invoices/159, whose exact response payload is not documented in the crawled material.\n\nThe x402 challenge was successfully captured (HTTP 402 with version 1 challenge), confirming the endpoint is live. Documentation on the site is extremely thin — the /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","pay-per-call API","x402 USDC endpoint","micropayment API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; the exact payload structure is unknown.","The endpoint path references a specific invoice ID (159), which may be a demo or placeholder resource rather than a general-purpose API.","The broader platform lists many endpoint categories but none could be verified beyond the landing page descriptions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/159","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/159","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is zero documentation on request/response schemas, no OpenAPI spec, and all doc pages return only a wallet-connect prompt. The specific purpose of the /stripe/invoices/159 endpoint is unclear beyond its 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'/api/v1/stripe/invoices/159':173 '/docs':210 '/pricing':212 '/readme':214 '0.02':10,24,80,153 '000':75 '0x8335':67 '1':195 '159':42 '20':74 '2913':68 '402':192 '6':84 'Base network API' 'accept':50 'access':34 'advertis':112 'ai/ml':124 'amount':72 'analysi':127 'analyt':123 'api':87,120 'application/json':55 'attach':96 'avail':240 'base':8,22,62,76 'behind':43 'broader':109 'call':119 'caller':94 'captur':190 'challeng':187,196 'classif':129 'commit':160 'confirm':197 'connect':220 'content':226 'contract':66 'convers':146 'crawl':183,243 'data':122,132 'decim':85 'document':180,202,235 'embed':130 'endpoint':6,20,30,49,149,170,199 'equal':79 'estim':140 'exact':175 'exampl':239 'exchang':135 'extrem':207 'feed':134 'finance/web3':131 'gas':139 'gate':3,17 'generat':147 'geocod':144 'header':101 'howev':161 'http':191 'id':41 'infer':125 'infrastructur':142 'invoic':5,19,38,40,169 'json-response' 'key':88 'limit':91 'list':151,164 'live':201 'lowpaymentfee' 'lowpaymentfee.com':32,110 'materi':184 'maximum':71 'micropayment API' 'minimum':158 'network':63 'no-api-key' 'openapi':230 'page':215 'path':172 'pay':9,23,117 'pay-per-cal':116 'pay-per-call API' 'pay-per-request' 'payload':177 'payment':46,57,100,106 'per':11,25,118,154 'platform':111 'post':51 'price':133 'prompt':222 'proof':107 'provid':33 'quot':138 'rate':90,136 'request':12,26,52,155 'request/response':233 'requir':93 'resourc':39 'respons':56,176 'return':54,217 'schema':234 'sentiment':126 'settl':59 'simpli':95 'site':205 'span':121 'spec':231 'specif':163 'stripe':4,18,37,168 'stripe invoice API' 'stripe-invoice' 'substant':225 'success':189 'suit':114 'summar':128 'thin':208 'token':137 'unit':77 'usag':238 'usd':81 'usdc':14,28,65,82 'usdc-base' 'use':64,83 'util':143 'valid':104,145 'version':194 'wall':47 'wallet':221 'whose':174 'x':99 'x-payment':98 'x402':2,16,45,105,186 'x402 USDC endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0d0b80fb-7d56-4276-a9b5-d14aedd1b441","listingId":"dfd4ba3f-1306-4fc8-b3b2-18600aae22fa","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/159","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:36.672Z"}],"sources":[{"listingId":"dfd4ba3f-1306-4fc8-b3b2-18600aae22fa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/159","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:36.672Z","lastSeenAt":"2026-04-25T13:03:04.058Z"}],"details":{"listingId":"dfd4ba3f-1306-4fc8-b3b2-18600aae22fa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/159 \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/159"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/159"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving Stripe invoice data programmatically via a single micropayment","Agent-driven invoice lookups without pre-registration or API keys","Integrating pay-per-use invoice access into automated financial workflows"],"bestFor":["Agents needing one-off Stripe invoice data without subscription overhead","Developers experimenting with x402 payment-gated APIs on Base","Low-volume, on-demand invoice retrieval"],"notFor":["High-volume bulk invoice processing (no documented batch support)","Users who need detailed API documentation or guaranteed SLAs","Non-crypto users who cannot settle payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.056Z"},"updatedAt":"2026-04-25T13:03:04.058Z"}}