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/11

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/11` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.

The broader platform offers endpoints across four categories: 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 listed at the same $0.02/request price point.

Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind the `/api/v1/transactions/11` endpoint is unclear — the description says only "Premium API Access" without specifying what data or service it returns. The endpoint is live and responds with a valid x402 challenge via POST.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-method

Use cases

  • —Accessing pay-per-call API services without subscription or API key management
  • —Making micro-transactions for data or utility endpoints using USDC on Base
  • —Integrating agent-driven workflows that pay per request via x402 protocol

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents that can autonomously pay for API calls via x402
  • —Users who prefer crypto-native payment rails over traditional billing

Not for

  • —Users needing well-documented APIs with clear request/response schemas
  • —High-volume use cases where per-request pricing may add up versus flat-rate plans
  • —Anyone requiring non-crypto payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/11 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/11
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the purpose of this specific endpoint is unclear beyond the generic label 'Premium API Access'.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'
  • —No OpenAPI or schema definition found for any endpoint
  • —The specific functionality of /api/v1/transactions/11 is undocumented and unclear
  • —Cannot verify what data or service is actually returned after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:01:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-25

Agent access

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