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/136

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/136` is listed as "Premium API Access" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, rate limits, or subscriptions are required — each request is individually settled on-chain.

The broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request.

However, documentation 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 examples of what the `/api/v1/transactions/136` endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality this specific transaction endpoint provides.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyjson-response

Use cases

  • —Accessing premium API data without subscription or API key management
  • —Making one-off paid API calls settled in USDC on Base
  • —Agent-driven workflows that need frictionless per-call payment

Fit

Best for

  • —Developers who want zero-signup, pay-as-you-go API access
  • —AI agents with x402-compatible wallets on Base
  • —Users who prefer on-chain micropayments over traditional billing

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who want bulk pricing or subscription discounts
  • —Developers without a Base-network USDC wallet

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/136
# Returns 402 with x402 challenge. Use an x402-compatible client to attach payment.

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/136
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what the /api/v1/transactions/136 endpoint actually returns. The docs pages are all empty "Connect wallet" stubs. This is effectively a stub listing.

Warnings

  • —No documentation available — all doc pages render only 'Connect wallet' with no content
  • —No OpenAPI or schema describing request parameters or response format
  • —Purpose of /api/v1/transactions/136 ('Premium API Access') is completely undocumented
  • —Cannot verify what data or functionality this endpoint provides without paying

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:06:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/Rvk4yM
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart