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/309

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities, all priced at $0.02 per request. Payment is settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/payments/309` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.

Note that the crawled documentation pages (docs, api, pricing, README) all rendered only a "Connect wallet" prompt with no further content, so there is no detailed API documentation, request/response schemas, or usage examples available. The exact functionality behind this particular endpoint path (`/payments/309`) is unclear — it may be a generic premium access gate or a specific resource. The site's landing page lists many other endpoints across categories like sentiment analysis, text summarization, geocoding, and crypto gas estimates, all at the same $0.02 price point.

Capabilities

x402-paymentusdc-basepay-per-requestjson-apino-api-keyno-rate-limit

Use cases

  • —Accessing premium API resources with per-call USDC micropayments on Base
  • —Agent-driven workflows that need keyless, on-demand API access
  • —Programmatic access to paid endpoints without subscription commitments

Fit

Best for

  • —Developers wanting zero-commitment pay-per-use API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over API key management

Not for

  • —Users needing detailed API documentation or guaranteed SLAs
  • —High-volume use cases where per-call pricing may add up quickly
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/309 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/309
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no API documentation, no request/response schema, and no examples available — the docs/pricing/README pages all render only a wallet connect prompt. The purpose of this specific endpoint path (/payments/309) is ambiguous.

Warnings

  • —No API documentation available — all doc pages render only 'Connect wallet'
  • —The specific functionality of /api/v1/payments/309 ('Premium API Access') is not described anywhere
  • —No request or response schema provided
  • —No OpenAPI spec or AI plugin manifest found

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:06:03Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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