x402basequality 0.35

Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/collections/16

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/collections/16` is labeled "Premium API Access" and accepts POST requests with payment of up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises four categories of endpoints: 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 listed endpoints are priced at $0.02 per request. The `/api/v1/collections/16` endpoint likely serves as a bundled or curated access point, though the exact response payload is undocumented.

Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is difficult to know what data or functionality the response actually provides.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keypost-endpoint

Use cases

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

Fit

Best for

  • —Developers who want zero-signup, pay-per-use API access
  • —AI agents with x402-compatible wallets on Base
  • —Projects needing low-cost micropayment-settled API calls

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who prefer subscription or bulk pricing
  • —Developers not set up for USDC payments on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/collections/16 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/collections/16
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC per call). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality behind 'Premium API Access' at /collections/16 is unknown.

Warnings

  • —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —No OpenAPI or schema definition for request or response payloads
  • —The specific functionality of /api/v1/collections/16 ('Premium API Access') is undocumented and unclear
  • —No usage examples or sample responses available from crawled content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 17:51:43Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/VS2qXd
Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required. — Clawmart · Clawmart