x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/383

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. Each request costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/payments/383` accepts POST requests and returns JSON. The x402 challenge confirms it is live, accepting exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The platform advertises a broad suite of sibling endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02/request price point. However, documentation beyond the landing page is extremely sparse (all subpages just show "Connect wallet"), so the actual functionality behind this particular `/payments/383` endpoint is unclear. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available.

Capabilities

x402-paymentusdc-base-networkpay-per-requestjson-responsepost-method

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments
  • —Agent-driven API consumption without API key management
  • —Pay-as-you-go data or utility access on Base L2

Fit

Best for

  • —Developers wanting keyless, pay-per-use API access
  • —AI agents with x402-compatible payment capabilities
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or schemas before integrating
  • —High-volume use cases where per-request pricing is inefficient
  • —Users without USDC on Base network

Quick start

# Send a POST with x402 payment header to access the endpoint
curl -X POST https://lowpaymentfee.com/api/v1/payments/383 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <your-x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/383
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually does, no request/response schema, no OpenAPI spec, and all doc pages are empty. The listing is effectively a stub with only payment metadata available.

Warnings

  • —No documentation available — all subpages (docs, api, pricing, README) return only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format
  • —The specific purpose of /api/v1/payments/383 is undocumented — 'Premium API Access' is the only descriptor
  • —Cannot verify what data or service is actually returned after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:22:45Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/PWz2HJ
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart