{"id":"455ff845-b92b-45ab-be70-d75d844a6913","shortId":"sZzKFx","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 (specifically for transaction ID 143) 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, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/143/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The x402 challenge advertises a max amount 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 timeout of 300 seconds.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual response schema, request parameters, and detailed behavior of this and other endpoints are unknown. The endpoint is confirmed live via a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","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"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty — only showing 'Connect wallet'","No request or response schema is documented; actual payload structure is unknown","Endpoint is hardcoded to transaction ID 143 — unclear if this is a demo or a real resource","No OpenAPI spec or AI plugin manifest available","Platform appears to be a demo or early-stage project with many advertised endpoints but no substantive docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/143/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/143/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages are empty stubs. The endpoint is also scoped to a single hardcoded transaction ID (143), making its general utility 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'0.02':10,24,77,137 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':131 '143':42 '20':125 '2913':132 '300':154 '402':210 '6':141 'Base network API' 'USDC micropayment API' 'accept':91 'access':167 'actual':187 'address':148 'advertis':120,158 'ai/ml':67 'amount':123 'analyt':66 'api':63,160 'application/json':96 'base':8,22,85,127,134 'behavior':194 'behind':43 'beyond':170 'broader':52 'call':79 'caller':104 'challeng':119,211 'confirm':205 'connect':183 'data':65,70 'decim':142 'detail':193 'document':169 'empti':176 'endpoint':6,20,30,89,199,203 'equal':136 'essenti':175 'finance/web3':69 'gate':3,17 'given':138 'handl':99 'header':111 'howev':168 'id':41 'includ':106 'infer':68 'instant':166 'json-response' 'key':161 'land':172 'limit':164 'live':206 'lowpaymentfee' 'lowpaymentfee.com':32 'max':122 'must':105 'network':86 'no-api-key' 'offer':55 'page':173,180 'paramet':191 'part':49 'pay':9,23,60 'pay-per-call API' 'pay-per-request':59 'payment':97,110,115,144 'paywal':46 'per':13,27,61,78 'platform':53,157 'post':92 'price':75 'proof':116 'protocol':103 'provid':33 'rate':163 'receipt':5,19,36 'request':14,28,62,93,190 'resourc':37 'respons':188 'return':95 'schema':189 'second':155 'sent':146 'servic':73 'settl':80 'show':182 'span':64 'specif':38,88 'sub':179 'sub-pag':178 'timeout':152 'transact':4,18,35,40 'transaction receipt API' 'transaction-receipt' 'unit':128 'unknown':201 'usdc':12,26,82,130,139 'usdc-base' 'util':72 'valid':114,209 'varieti':57 'via':100,207 'wallet':184 'x':109 'x-payment':108 'x402':2,16,45,102,118 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"79c13f5e-f4ce-4322-9936-ba17b042ce66","listingId":"455ff845-b92b-45ab-be70-d75d844a6913","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/143/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":"2026-04-18T18:58:36.976Z"}],"sources":[{"listingId":"455ff845-b92b-45ab-be70-d75d844a6913","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/143/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:36.976Z","lastSeenAt":"2026-04-25T00:05:09.934Z"}],"details":{"listingId":"455ff845-b92b-45ab-be70-d75d844a6913","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/143/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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/143/receipt"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/143/receipt"},{"claim":"Documentation sub-pages only display 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 143 via a single micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Programmatic access to transaction data without API key management"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need one-off transaction receipt retrieval","Low-friction API access without subscription or key provisioning"],"notFor":["Bulk transaction receipt retrieval (endpoint is scoped to a single transaction ID)","Users who need detailed API documentation or response schema guarantees","Production systems requiring SLA or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.573Z"},"updatedAt":"2026-04-25T00:05:09.934Z"}}