x402basequality 0.30

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/19

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.

The specific endpoint at `/api/v1/transactions/19` is labeled "Premium API Access" and carries a maximum charge of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the x402 exact-payment scheme. The endpoint accepts POST requests and returns `application/json`.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind this particular `/transactions/19` endpoint is unclear — the name "Premium API Access" is generic and does not describe what data or service is returned.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Accessing paid API endpoints without traditional API key registration
  • —Making micropayment-gated API calls settled in USDC on Base
  • —Integrating pay-per-use services into agent workflows via x402 protocol

Fit

Best for

  • —Developers wanting keyless, pay-per-call API access
  • —AI agents that can settle x402 payments on Base
  • —Users who prefer on-chain micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring high-throughput batch processing with predictable billing
  • —Developers who cannot transact in USDC on the Base network

Quick start

# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.
# Without a payment library, you'll get a 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/transactions/19 \
  -H 'Content-Type: application/json'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/19
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the actual functionality of this specific endpoint is completely undescribed. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt.

Warnings

  • —No OpenAPI or schema documentation available — impossible to determine request parameters or response format
  • —The endpoint name 'Premium API Access' is generic and does not describe what the endpoint actually does
  • —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
  • —Cannot verify what data or service is returned by /api/v1/transactions/19

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:30:47Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/eAjprc
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart