{"id":"3e763dcc-e016-4493-8a87-e5a097ca7163","shortId":"YYDrza","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific transaction receipt (transaction 351) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (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 priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint probed — `/api/v1/transactions/351/receipt` — returned a valid x402 challenge with a `maxAmountRequired` of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`. No OpenAPI spec, detailed documentation, or response schema was found during crawling; the docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content.\n\nBecause this is a single transaction receipt endpoint rather than a general-purpose API, its utility to agents is narrow unless it is representative of a broader pattern (e.g., any `/api/v1/transactions/{id}/receipt` path). The platform's landing page suggests a much wider API surface, but none of those other endpoints were probed or documented with schemas.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-pricing","transaction-receipt","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 USDC endpoint","pay-per-call API","Base network API","lowpaymentfee","micropayment API","crypto payment gateway"],"warnings":["No OpenAPI or response schema available for this endpoint","Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no content","This endpoint targets a single hardcoded transaction ID (351); unclear if parameterized paths are supported","No example responses available; actual response format is unknown","The broader platform advertises many API categories but none were probed or documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/351/receipt","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/transactions/351/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no response schema, no example responses, and the crawled documentation pages are empty (only 'Connect wallet'). The specific endpoint is a single transaction receipt with no clear general-purpose utility. The broader platform advertises many endpoints but none are 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'/api/v1/transactions/351/receipt':117 '/receipt':225 '0.02':92,138 '000':128 '0x8335':133 '20':127 '300':151 '351':41 '6':142 'Base network API' 'accept':156 'access':34 'advertis':50 'agent':210 'ai':62 'analysi':66 'analyt':61 'api':58,104,177,206,236 'application/json':161 'base':8,22,100,129,135 'behind':42 'broader':47,219 'call':12,26 'challeng':122 'classif':68 'commit':112 'connect':185 'content':191 'convers':85 'crawl':173 'crypto payment gateway' 'data':60 'decim':143 'detail':165 'doc':175 'document':166,247 'e.g':221 'embed':69 'endpoint':6,20,30,88,115,155,199,243 'equal':137 'estim':79 'exact':148 'exchang':74 'feed':73 'financ':70 'found':171 'gas':78 'gate':3,17 'general':204 'general-purpos':203 'generat':86 'geocod':83 'given':139 'id':224 'infrastructur':81 'json-response' 'key':105 'land':230 'learn':64 'limit':108 'lowpaymentfee' 'lowpaymentfee.com':32,48 'machin':63 'maxamountrequir':125 'micropayment API' 'minimum':111 'much':234 'narrow':212 'network':101 'none':239 'openapi':163 'page':180,231 'paid':9,23 'path':226 'pattern':220 'pay':55 'pay-per-call API' 'pay-per-request':54 'payment':145 'paywal':45 'per':11,25,56,93 'per-cal':10,24 'per-request-pricing' 'platform':49,228 'post':157 'price':72,90,176 'probe':116,245 'prompt':187 'provid':33 'purpos':205 'quot':77 'rate':75,107 'rather':200 'readm':179 'receipt':5,19,39,198 'render':182 'repres':216 'request':57,94,158 'respons':168 'return':118,160 'schema':169,249 'scheme':146 'second':152 'sentiment':65 'settl':95 'singl':196 'span':59 'spec':164 'specif':37,114 'substant':190 'suggest':232 'suit':52 'summar':67 'surfac':237 'timeout':153 'token':76 'transact':4,18,38,40,197 'transaction receipt API' 'transaction-receipt' 'unit':130 'unless':213 'usdc':14,28,97,132,140 'usdc-base' 'util':82,208 'valid':84,120 'wallet':186 'web3':71 'wider':235 'x402':2,16,44,121 'x402 USDC endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6026f2d7-9df4-4232-b301-b77879dd9c0a","listingId":"3e763dcc-e016-4493-8a87-e5a097ca7163","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/transactions/351/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:21.073Z"}],"sources":[{"listingId":"3e763dcc-e016-4493-8a87-e5a097ca7163","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/351/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:21.073Z","lastSeenAt":"2026-04-24T08:03:43.893Z"}],"details":{"listingId":"3e763dcc-e016-4493-8a87-e5a097ca7163","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/351/receipt \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/351/receipt"},{"claim":"All endpoints 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":"The platform advertises APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/351/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 351 via a single micropayment","Demonstrating x402 payment flow on Base with USDC","Programmatic access to paid API endpoints without API key management"],"bestFor":["Agents or developers experimenting with x402 payment protocol","Accessing pay-per-use endpoints without subscription or API key signup","Low-cost single-call data retrieval on Base network"],"notFor":["Bulk or high-volume transaction receipt retrieval (no documented batch endpoint)","Users who need detailed API documentation or response schemas before integrating","Use cases requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.15Z"},"updatedAt":"2026-04-24T08:03:43.893Z"}}