{"id":"4c56038f-ef09-41a6-9e81-b38aad831ac5","shortId":"VVLRA6","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 ID 353) 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 commitments required.\n\nThe specific endpoint probed (/api/v1/transactions/353/receipt) returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage x402 showcase rather than a mature API provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","This endpoint is for a specific transaction ID (353); unclear if it generalizes or is a demo artifact","The platform may be an early-stage demonstration rather than a production service"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/353/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/353/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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no examples. The specific endpoint appears to be for a single transaction receipt (ID 353) with unclear utility. Docs pages are 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'/api/v1/transactions/353/receipt':118 '/docs':178 '/pricing':180 '/readme':182 '0.02':93,145 '000':129 '0x8335':134 '20':128 '300':162 '353':42 '6':140 'Base network API' 'USDC micropayment API' 'accept':167 'access':34 'actual':212 'advertis':51,153 'ai':63 'analysi':67 'analyt':62 'api':59,105,231 'appear':216 'application/json':172 'base':8,22,101,130,136 'base-network' 'behind':43 'broader':48 'call':12,26,147 'challeng':123 'classif':69 'commit':112 'connect':188 'consist':148 'contain':213 'content':194 'convers':86 'crypto payment endpoint' 'data':61 'decim':141 'demonstr':220 'document':173,203 'earli':223 'early-stag':222 'embed':70 'endpoint':6,20,30,89,116,166 'estim':80 'exact':159 'exampl':206 'exchang':75 'extrem':175 'feed':74 'financ':71 'gas':79 'gate':3,17 'generat':87 'geocod':84 'id':41 'infrastructur':82 'json-response' 'key':106 'learn':65 'limit':109 'lowpaymentfee' 'lowpaymentfee.com':32,49 'machin':64 'matur':230 'maxamountrequir':126 'network':102 'no-api-key' 'openapi':198 'page':183 'paid':9,23 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':211 'payment':156 'paywal':46 'per':11,25,57,94,146 'per-cal':10,24 'platform':50,215 'post':168 'price':73,91,154 'probe':117 'prompt':190 'provid':33,232 'quot':78 'rate':76,108 'rather':227 'receipt':5,19,39,210 'render':185 'request':58,95,169 'request/response':201 'requir':113 'return':119,171 'schema':202 'scheme':157 'second':163 'sentiment':66 'settl':96 'showcas':226 'sinc':137 'site':151 'span':60 'spars':176 'spec':199 'specif':37,115 'stage':224 'suit':53 'summar':68 'timeout':164 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'translat':143 'unit':131 'usdc':14,28,98,133,138 'usdc-settlement' 'use':139 'util':83 'valid':85,121 'wallet':189 'web3':72 'x402':2,16,45,122,225 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"93e804b2-86db-4c0c-a921-a06472e97e8e","listingId":"4c56038f-ef09-41a6-9e81-b38aad831ac5","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/353/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":"2026-04-18T19:26:15.592Z"}],"sources":[{"listingId":"4c56038f-ef09-41a6-9e81-b38aad831ac5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/353/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:15.592Z","lastSeenAt":"2026-04-24T07:32:36.545Z"}],"details":{"listingId":"4c56038f-ef09-41a6-9e81-b38aad831ac5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/353/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":"All endpoints 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":"Platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/353/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 353 via a single USDC micropayment","Demonstrating x402 protocol payment flows on Base network","Integrating pay-per-request APIs without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base for per-call API access","Projects needing keyless, pay-as-you-go API consumption"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","Applications requiring high-throughput with predictable billing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.417Z"},"updatedAt":"2026-04-24T07:32:36.545Z"}}