x402basequality 0.35

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/385

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach an X-PAYMENT header with a signed USDC payment, and the server fulfills the request upon verification.

The specific endpoint at `/api/v1/transactions/385` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and API pages all render only a "Connect wallet" prompt), so the actual response schemas, input parameters, and data sources for these endpoints are unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Accessing premium API data with per-call USDC micropayments on Base
  • —Agent-driven workflows that need keyless, pay-as-you-go API access
  • —Programmatic access to analytics, AI inference, or financial data without subscriptions

Fit

Best for

  • —Developers wanting zero-commitment, pay-per-use API access
  • —AI agents with x402-compatible wallets on Base
  • —Users who prefer crypto micropayments over traditional API key subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume consumers who would benefit from bulk pricing or rate-limited tiers
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/385 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <signed-x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/385
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no examples, and the docs/pricing/API pages are all blank beyond a wallet-connect prompt. The purpose of this specific /transactions/385 path is unclear beyond the generic 'Premium API Access' label.

Warnings

  • —No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'
  • —The specific purpose and expected input/output of /api/v1/transactions/385 is undocumented
  • —No OpenAPI spec or response schema provided
  • —Cannot verify what data or service this endpoint actually returns

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:31:00Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/9FSTDt
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart