x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/299

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 lowpaymentfee.com platform, which hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network, with no API keys, rate limits, or commitments required.

The specific endpoint `/api/v1/payments/299` is labeled "Premium API Access" in the x402 challenge but lacks detailed documentation about what it returns. The probe confirms it is live, returning a valid 402 challenge with x402 version 1, accepting exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST requests.

The broader platform advertises 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 pages (docs, pricing, README) all render only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for this or any endpoint are unknown.

Capabilities

x402-paymentusdc-basepay-per-requesthttp-postno-api-key

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints

Fit

Best for

  • —Developers wanting zero-commitment, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or well-defined schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Developers who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/299 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/299
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific endpoint (/api/v1/payments/299) is entirely unclear beyond the generic label 'Premium API Access'. Docs pages all render only 'Connect wallet' with no content.

Warnings

  • —No documentation available — all doc pages render only 'Connect wallet'
  • —The specific function of /api/v1/payments/299 is undocumented; 'Premium API Access' is vague
  • —No request or response schema is provided; integration requires trial and error
  • —The platform lists many endpoints but none have documented input/output contracts

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:01:28Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/NtJ4Ya
Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC. — Clawmart · Clawmart