{"id":"b1c83372-9947-4e54-b2f8-806f384e0d61","shortId":"qM2qnX","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 61) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/61/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge specifying the USDC asset contract on Base (`0x8335…`), and must attach an `X-PAYMENT` header with a valid payment proof. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. No API keys or rate limits are advertised; access is purely pay-per-use.\n\nDocumentation is extremely sparse — 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 challenge's `outputSchema`, and no explanation of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage x402 showcase rather than a mature production API.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","json-response"],"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, /pricing, /api, /README) are all empty beyond a 'Connect wallet' prompt","No OpenAPI or schema describing request parameters or response body","Endpoint is scoped to a single transaction ID (61) — unclear if this is a demo or production resource","No information on what the receipt payload actually contains","Platform appears to be an early-stage or demonstration x402 showcase"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/61/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/61/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, but documentation is effectively nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and no description of what the receipt payload contains. The endpoint path is specific to a single transaction ID (61), making its general utility 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'/api/v1/transactions/61/receipt':85 '/docs':163 '/pricing':164 '/readme':167 '0.02':71,140 '000':131 '0x8335':111 '20':130 '402':102 '6':136 '61':40 'Base network API' 'USDC micropayment API' 'accept':86 'access':151 'actual':202 'advertis':53,150 'ai':60 'amount':127 'analyt':59 'api':55,144,222 'appear':206 'application/json':91 'asset':107 'attach':114 'base':8,22,80,110,132 'behind':41 'beyond':188 'broader':50 'call':12,26,142 'caller':99 'categori':56 'challeng':103,191 'connect':173 'contain':203 'content':179 'contract':108 'data':58 'decim':137 'demonstr':210 'document':158 'earli':213 'early-stag':212 'endpoint':6,20,30,84 'equal':139 'explan':196 'extrem':160 'financ':63 'gate':3,17 'handl':94 'header':119 'id':39 'includ':57 'infrastructur':66 'json-response' 'key':145 'learn':62 'limit':148 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'matur':220 'max':126 'multipl':54 'must':113 'network':81 'openapi':183 'outputschema':193 'page':168 'paid':9,23 'part':47 'pay':155 'pay-per-call API' 'pay-per-request' 'pay-per-us':154 'payload':201 'payment':92,118,123 'paywal':44 'per':11,25,72,141,156 'per-cal':10,24 'platform':51,205 'post':87 'price':69 'product':221 'prompt':175 'proof':124 'protocol':98 'provid':33 'pure':153 'rate':147 'rather':217 'receipt':5,19,36,200 'receiv':100 'render':170 'request':73,88 'request/response':186 'requir':128 'resourc':37 'return':90 'schema':187 'settl':75 'showcas':216 'spars':161 'spec':184 'specif':83 'specifi':104 'stage':214 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':133 'usdc':14,28,77,106,135 'usdc-base' 'use':157 'util':67 'valid':122 'via':95 'wallet':174 'web3':64 'x':117 'x-payment':116 'x402':2,16,43,97,190,215 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"89871ddb-2c00-4cbc-b4e8-193d4d8d8f8d","listingId":"b1c83372-9947-4e54-b2f8-806f384e0d61","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/61/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":"2026-04-18T19:26:56.864Z"}],"sources":[{"listingId":"b1c83372-9947-4e54-b2f8-806f384e0d61","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/61/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:56.864Z","lastSeenAt":"2026-04-24T02:02:57.774Z"}],"details":{"listingId":"b1c83372-9947-4e54-b2f8-806f384e0d61","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/61/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid 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/61/receipt"},{"claim":"The platform advertises $0.02 per request across all API categories with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/61/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 61 via a single paid API call","Demonstrating x402 protocol integration for agent-to-agent micropayments","Testing USDC-on-Base payment flows in a low-cost environment"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need to demonstrate pay-per-call USDC micropayments on Base","Testing x402 client libraries against a live endpoint"],"notFor":["Production workloads requiring documented request/response schemas","Users who need bulk or subscription-based API access","Anyone needing endpoints beyond a single transaction receipt"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.503Z"},"updatedAt":"2026-04-24T02:02:57.774Z"}}