x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource 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.
The specific endpoint `/api/v1/transactions/216/receipt` returns a JSON receipt for transaction ID 216. The x402 challenge confirms it accepts POST requests, requires an exact payment of 20,000 base-unit USDC (i.e., $0.02 given USDC's 6 decimals) to wallet `0x1A2B…85F3`, and responds with `application/json`. No API keys or rate limits are advertised; access is gated purely by the x402 micropayment protocol.
The platform's landing page lists additional endpoints across four categories — Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All share the same $0.02 per-request pricing. Documentation pages beyond the landing page returned only a "Connect wallet" prompt with no further technical detail, so the actual request/response schemas for this and sibling endpoints remain undocumented.
Capabilities
Use cases
- —Retrieving a transaction receipt for a specific transaction ID via micropayment
- —Demonstrating x402 protocol integration for pay-per-request APIs
- —Agents autonomously purchasing transaction data without API key provisioning
Fit
Best for
- —Developers exploring x402 micropayment protocol integrations
- —AI agents that need to fetch transaction receipts without pre-registered credentials
- —Low-volume, on-demand access to transaction data at $0.02 per call
Not for
- —High-volume bulk transaction data retrieval (no documented batch endpoints)
- —Users who need detailed API documentation or OpenAPI specs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/216/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to proceed.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no documentation beyond a landing page, no example request/response payloads, and the docs/pricing/README pages all return only a wallet-connect prompt. The specific purpose of this receipt endpoint is only inferable from its URL path.
Warnings
- —No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet' with no technical content.
- —The exact request body schema and response format for this endpoint are unknown; example_request_json and example_response_json are null.
- —This endpoint is for a single transaction ID (216); it is unclear whether other transaction IDs are available or how they are discovered.
- —The broader platform lists many endpoints but none have been individually verified beyond this one.
Citations
- —The endpoint returns a 402 challenge requiring 20,000 base-unit USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/216/receipt
- —The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02 per requesthttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/216/receipt