{"id":"c59c1343-49ec-4985-9b3a-02cd4840f9bc","shortId":"y567xz","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 53) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per call and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/53/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform markets itself as requiring no API keys, no rate limits, and no commitments — just per-request micropayments. 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 spec, no request/response schema documentation, and no example payloads available. The exact data returned by this receipt endpoint is unknown beyond the stated mimeType of application/json.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","payment receipt","web3 API"],"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","The endpoint is for a specific transaction ID (53); it is unclear whether this is a demo or a production resource","No examples of request body or response payload could be found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/53/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/53/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific purpose of this receipt endpoint is vague. Effectively a stub 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'/api/v1/transactions/53/receipt':89 '/docs':178 '/pricing':180 '/readme':182 '0.02':10,24,75,134 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':128 '20':122 '2913':129 '300':149 '53':40 '6':138 'Base network API' 'USDC pay-per-call' 'accept':90 'address':145 'advertis':118 'ai/ml':65 'analyt':64 'api':61,159 'application/json':225 'avail':209 'base':8,22,84,124,131 'base-network' 'behind':41 'beyond':220 'broader':50 'call':77 'caller':103 'challeng':117 'commit':166 'connect':188 'data':63,68,212 'decim':139 'detail':195 'document':173,204 'endpoint':6,20,30,88,217 'equal':133 'exact':211 'exampl':207 'extrem':175 'finance/web3':67 'gate':3,17 'given':135 'handl':98 'header':110 'howev':172 'id':39 'includ':105 'infer':66 'json':95 'json-response' 'key':160 'limit':163 'lowpaymentfee' 'lowpaymentfee.com':32 'market':154 'maxamountrequir':120 'micropay':171 'mimetyp':223 'must':104 'network':85 'no-api-key' 'offer':53 'openapi':199 'page':183 'part':47 'pay':9,23,58 'pay-per-request':57 'payload':208 'payment':96,109,114,141 'payment receipt' 'paywal':44 'per':13,27,59,76,169 'per-request':168 'platform':51,153 'post':91 'price':73 'prompt':190 'proof':115 'protocol':102 'provid':33 'rate':162 'receipt':5,19,36,216 'render':185 'request':14,28,60,92,170 'request/response':202 'requir':157 'resourc':37 'return':94,213 'schema':203 'second':150 'sent':143 'servic':71 'settl':79 'span':62 'spars':176 'spec':200 'specif':87 'state':222 'technic':194 'timeout':151 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':125 'unknown':219 'usdc':12,26,81,127,136 'usdc-micropayment' 'util':70 'valid':113 'varieti':55 'via':99 'wallet':189 'web3 API' 'x':108 'x-payment':107 'x402':2,16,43,101 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0cc9769f-e5cc-4beb-bf61-b275ecb3d01d","listingId":"c59c1343-49ec-4985-9b3a-02cd4840f9bc","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/53/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":"2026-04-18T19:26:52.064Z"}],"sources":[{"listingId":"c59c1343-49ec-4985-9b3a-02cd4840f9bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/53/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:52.064Z","lastSeenAt":"2026-04-24T04:04:20.420Z"}],"details":{"listingId":"c59c1343-49ec-4985-9b3a-02cd4840f9bc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/53/receipt \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/53/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/53/receipt"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 53 via micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Programmatic access to financial transaction data without API key management"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that can settle USDC micropayments on Base","Use cases needing keyless, per-request API access"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume batch retrieval where per-request pricing is inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.664Z"},"updatedAt":"2026-04-24T04:04:20.420Z"}}