{"id":"ccdebe05-6830-4a16-a3e2-55d4977ee82e","shortId":"MVa5fX","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 a transaction receipt resource (transaction ID 254) behind an x402 paywall. The provider operates a broader platform offering multiple API categories — data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all gated via the x402 protocol on the Base network with USDC payments.\n\nThe specific endpoint `/api/v1/transactions/254/receipt` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per request. The platform's landing page confirms uniform $0.02/request pricing across all endpoints. No API keys or rate limits are required; payment is handled entirely through the x402 payment header. The payment is settled on the Base L2 network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\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 endpoint is confirmed live (returns 402 with a valid x402 challenge), but the lack of documentation makes it difficult to know what data the receipt contains or what POST body (if any) is expected.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","per-call-pricing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment gateway"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition for request body or response payload.","The specific data returned by the /transactions/254/receipt endpoint is unknown — the endpoint path suggests a single hardcoded transaction ID, which may indicate a demo or placeholder.","The broader platform advertises many endpoint categories (AI, analytics, finance, utilities) but none have documented schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/254/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/254/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 with a valid x402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty. The specific purpose of this receipt endpoint is unclear beyond its URL 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'/api/v1/transactions/254/receipt':96 '/docs':175 '/pricing':177 '/readme':179 '/request':136 '0.02':125,135 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':169 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':118 '20':111 '254':40 '402':217 '6':121 'Base network API' 'USDC micropayment API' 'accept':97 'across':138 'actual':209 'address':168 'advertis':106 'ai/ml':57 'analyt':56 'api':53,142 'asset':117 'base':8,22,88,113,164 'base-network' 'behind':41 'bodi':241 'broader':49 'call':12,26 'categori':54 'challeng':105,222 'classif':61 'confirm':133,214 'connect':185 'contain':210,237 'content':191 'convers':78 'cost':109 'crypto payment gateway' 'data':55,234 'decim':122 'difficult':230 'document':170,200,227 'embed':62 'endpoint':6,20,30,95,140,212 'entir':152 'equat':123 'estim':72 'exampl':203 'exchang':67 'expect':245 'extrem':172 'feed':66 'financ':63 'gas':71 'gate':3,17,81 'generat':79 'geocod':76 'handl':151 'header':157 'id':39 'infer':58 'infrastructur':74 'json':102 'json-response' 'key':143 'know':232 'l2':165 'lack':225 'land':131 'limit':146 'live':215 'lowpaymentfee' 'lowpaymentfee.com':32 'make':228 'maximum':108 'multipl':52 'network':89,166 'no-api-key' 'offer':51 'openapi':195 'oper':47 'page':132,180 'paid':9,23 'pay-per-call API' 'payload':208 'payment':92,149,156,159 'paywal':44 'per':11,25,126 'per-cal':10,24 'per-call-pricing' 'platform':50,129 'post':98,240 'price':65,137 'prompt':187 'protocol':85 'provid':33,46 'quot':70 'rate':68,145 'receipt':5,19,36,207,236 'render':182 'request':99,127 'request/response':198 'requir':148 'resourc':37 'return':101,216 'schema':199 'sentiment':59 'settl':161 'spars':173 'spec':196 'specif':94 'summar':60 'token':69 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'uniform':134 'unit':114 'usdc':14,28,91,116 'usdc-settlement' 'use':120 'util':75 'valid':77,220 'via':82 'wallet':186 'web3':64 'x402':2,16,43,84,104,155,221 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"609c6258-39e1-4bf4-8102-1d86be650842","listingId":"ccdebe05-6830-4a16-a3e2-55d4977ee82e","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/254/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":"2026-04-18T18:59:47.589Z"}],"sources":[{"listingId":"ccdebe05-6830-4a16-a3e2-55d4977ee82e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/254/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:47.589Z","lastSeenAt":"2026-04-24T13:03:15.402Z"}],"details":{"listingId":"ccdebe05-6830-4a16-a3e2-55d4977ee82e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/254/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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/254/receipt"},{"claim":"The platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 254 via a micropayment","Programmatic access to paid API resources without API key management","Agent-driven workflows that settle per-call costs in USDC on Base"],"bestFor":["Developers or agents needing x402-compatible paid endpoints on Base","Use cases requiring keyless, pay-per-request API access","Exploring x402 protocol integration patterns"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Bulk or high-volume use cases where per-request pricing may add up","Anyone needing endpoints beyond this single transaction receipt without further exploration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.319Z"},"updatedAt":"2026-04-24T13:03:15.402Z"}}