{"id":"22c88fb0-6b11-436a-a815-1824cf59ba1c","shortId":"7Ypys3","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 transaction receipt (resource ID 308) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and payment settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/308/receipt` returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 USD. Payment is made via the x402 exact scheme: the caller includes an X-PAYMENT header with a signed payment proof, and the server returns the receipt as application/json. The challenge specifies a 300-second timeout and accepts POST requests.\n\nDocumentation on the site is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no description of what fields the receipt JSON contains. The platform appears to be a demonstration or early-stage x402 marketplace rather than a mature production API.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","402 payment required"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or response schema provided; the contents of the receipt JSON are unknown","The specific endpoint path (/transactions/308/receipt) suggests a single fixed resource rather than a parameterized API","Platform may be a demo or early-stage project; maturity and reliability are unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/308/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/308/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 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no response schema, and no explanation of what the transaction receipt contains. The listing is effectively a 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'/api/v1/transactions/308/receipt':92 '/docs':164 '/pricing':165 '/readme':168 '0.02':70,114 '000':101 '0x8335':106 '20':100 '2913':107 '300':149 '308':41 '402':95 '402 payment required' '6':110 'Base network API' 'USDC micropayment API' 'accept':153 'access':34 'advertis':50 'ai':59 'analyt':58 'api':54,75,222 'appear':206 'application/json':144 'base':8,22,87,102,109 'behind':42 'beyond':189 'broader':47 'call':12,26 'caller':125 'categori':55 'challeng':96,146 'connect':174 'contain':203 'content':180 'data':57 'decim':111 'demonstr':210 'descript':196 'document':156 'earli':213 'early-stag':212 'endpoint':6,20,30,91 'equal':113 'exact':122 'extrem':161 'field':199 'financ':62 'gate':3,17 'header':131 'id':40 'includ':56,126 'infrastructur':65 'json':202 'json-response' 'key':76 'learn':61 'limit':79 'lowpaymentfee' 'lowpaymentfee.com':32,48 'machin':60 'made':118 'marketplac':216 'matur':220 'network':88 'no-api-key' 'openapi':184 'outputschema':192 'page':169 'paid':9,23 'pay-per-call API' 'payment':81,116,130,135 'paywal':45 'per':11,25,71 'per-cal':10,24 'per-call-pricing' 'platform':49,205 'post':154 'price':68 'product':221 'prompt':176 'proof':136 'provid':33 'rate':78 'rather':217 'receipt':5,19,38,142,201 'render':171 'request':72,97,155 'request/response':187 'resourc':39 'return':93,140 'schema':188 'scheme':123 'second':150 'server':139 'settl':82 'sign':134 'site':159 'spec':185 'specif':90 'specifi':147 'stage':214 'stub':193 'suit':52 'thin':162 'timeout':151 'transact':4,18,37 'transaction receipt API' 'transaction-receipt' 'unit':103 'usd':115 'usdc':14,28,84,105 'usdc-base' 'util':66 'via':119 'wallet':175 'web3':63 'x':129 'x-payment':128 'x402':2,16,44,121,191,215 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2d4e7de5-d0b5-418e-b0af-1862e28ba35d","listingId":"22c88fb0-6b11-436a-a815-1824cf59ba1c","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/308/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":"2026-04-18T19:25:58.016Z"}],"sources":[{"listingId":"22c88fb0-6b11-436a-a815-1824cf59ba1c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/308/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:58.016Z","lastSeenAt":"2026-04-24T10:33:27.880Z"}],"details":{"listingId":"22c88fb0-6b11-436a-a815-1824cf59ba1c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/308/receipt\n# Returns 402 with x402 challenge. Include X-PAYMENT header with signed USDC payment proof to receive the receipt.","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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/308/receipt"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt by paying $0.02 in USDC on Base","Demonstrating x402 protocol payment flows for agent-to-agent commerce","Integrating pay-per-call APIs without traditional API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can sign USDC payments on Base","Use cases needing keyless, pay-per-request API access"],"notFor":["Production workloads requiring documented response schemas and SLAs","Users without a Base-compatible wallet or USDC balance","High-throughput batch processing where per-call payment overhead is impractical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.263Z"},"updatedAt":"2026-04-24T10:33:27.880Z"}}