x402 Toolbox
Free, read-only MCP tools exposing 14 of x402 Toolbox's cheap data endpoints: market snapshot, gas data, ETH price, transaction verification, address enrichment, attestation log and more. The full catalog of 28 pay-per-call x402 endpoints (USDC on Base) is at lab.paidapis.net.
Hosted MCP Server
npx add-mcp 'https://lab.paidapis.net/mcp'Installs into Claude Code, Codex, Cursor and more
Documentation
x402 Toolbox
A toolbox of x402 payment-protocol mechanics — 28 small real endpoints, each a distinct pattern. USDC on Base mainnet, no accounts, no API keys.
Endpoints
| Path | Price | Description |
|---|---|---|
GET /api/market-snapshot | $0.01 | Aggregated market snapshot |
GET /api/normalized-gas | $0.01 | Normalized Ethereum + Base gas data |
GET /api/gas-comparator | $0.01 | Cross-chain gas comparator |
GET /api/large-usdc-transfers | $0.02 | Large USDC transfer filter |
GET /api/enrich-address | $0.01 | On-chain address enrichment |
GET /api/gas-metrics | $0.01 | Derived gas price metrics |
POST /api/alerts/subscribe | $0.02 | Subscribe a gas-price alert webhook |
POST /api/wallet-watch/subscribe | $0.02 | Subscribe a wallet-activity webhook |
POST /api/ownership/challenge | free | Issue a wallet-ownership challenge (free) |
POST /api/ownership/verify | $0.02 | Verify a wallet-ownership signature |
POST /api/document-anchor/create | $0.02 | Blockchain-anchored document proof-of-existence |
POST /api/contract-risk/summarize | $0.01–$0.0488 | Plain-English smart-contract risk summarizer |
GET /api/reliable-eth-price | $0.01 | Reliable ETH/USD price |
GET /api/wiki-summary | $0.01 | Wikipedia article summary as JSON |
GET /api/verify-tx | $0.02 | Signed on-chain transaction confirmation oracle |
GET /api/verify-tx-multi-source | $0.05 | Multi-source on-chain confirmation oracle |
GET /api/attestation-log | $0.02 | Signed oracle attestation history |
POST /api/escrow/create | $0.02 | Create a soft-escrow release condition |
POST /api/invoice/create | $0.001 | Create a signed, payable invoice |
POST /api/subscriptions/register | $0.01 | Register a subscription for renewal reminders |
GET /api/resize-image | $0.005–$0.0800 | Metered image resize |
GET /api/batch-resize | $0.005–$0.4000 | Batch metered image resize |
GET /api/tax-lot-calculator | $0.05–$1.00 | FIFO tax-lot calculator |
GET /api/freshness-priced-data | $0.002–$0.02 | Freshness-tiered gas/price data |
POST /api/leaderboard/list | $0.005 | Pay for leaderboard visibility |
POST /api/auction/bid | free | Place a free, balance-verified auction bid |
POST /api/prediction/markets | free | Create a free prediction market |
POST /api/bundle/subscribe | $0.03 | Subscribe to the all-access bundle |
POST /api/insured-feed/subscribe | $0.001–$5 | Subscribe to the insured price feed |
GET /api/reputation | $0.01 | On-chain + ledger reputation score |
GET /api/gas-history-export | $0.005–$2.8800 | Historical gas price export |
How to call it
Standard x402 flow — request the endpoint, get a 402 with payment details, sign and resend with an x402-aware client. No pre-registration.
curl https://lab.paidapis.net/api/market-snapshot
# -> 402 Payment Required, with payment details in the response
Machine-readable spec
/openapi.json — full OpenAPI spec with pricing (x-payment-info) per route.
/api/directory — live reachability + real settled-payment history per endpoint.