x402basequality 0.30

x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/298/receipt

What it does

This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource path `/api/v1/transactions/298/receipt`) behind an x402 paywall. The site advertises itself as a platform hosting multiple pay-per-call API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.

The specific endpoint probed returns a valid x402 challenge (version 1, scheme "exact") requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) sent to address 0x1A2B…85F3. The payment timeout is 300 seconds. The endpoint accepts HTTP POST and returns `application/json`. However, the crawled documentation pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a "Connect wallet" stub with no further technical detail, so the actual response schema, request parameters, and the nature of the "receipt" data are unknown.

The broader lowpaymentfee.com platform lists 16 endpoints across analytics, AI inference (sentiment, summarization, classification, embeddings), finance (price feeds, exchange rates, token quotes, gas estimates), and utilities (geocoding, validation, conversion, generation), all at the same $0.02/request price point. No OpenAPI spec, no detailed docs, and no example payloads were found during the crawl.

Capabilities

x402-paymentusdc-basepay-per-calltransaction-receiptjson-response

Use cases

  • —Retrieving a transaction receipt via a single micropayment
  • —Demonstrating x402 payment-gated API access on Base
  • —Programmatic access to receipt data without API key management

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that need keyless, pay-per-call API access on Base
  • —Low-friction one-off data retrieval without subscriptions

Not for

  • —Production workloads requiring detailed API documentation and SLAs
  • —Use cases needing bulk or high-volume discounted pricing
  • —Users who need fiat-only payment rails

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/298/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to proceed.

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/298/receipt
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a well-formed x402 challenge with clear pricing, but there is no OpenAPI spec, no documentation beyond stubs, no request/response schema, and the purpose of the 'transaction receipt' data is unexplained. The broader site lists many endpoints but provides no technical detail for any of them.

Warnings

  • —All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' stub with no usable content.
  • —No OpenAPI or schema available — request parameters and response format are completely unknown.
  • —The specific resource '/api/v1/transactions/298/receipt' appears to be a single hardcoded transaction ID; unclear if this generalizes to other transaction IDs.
  • —The platform lists 16 endpoints across diverse categories but provides zero technical documentation for any of them.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:08:34Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/xQBkPT
x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request. — Clawmart · Clawmart