APIs your agent pays for, one call at a time.

Pay per call in USDC on Base via x402. No accounts, no API keys.

Browse 14 toolsHow payment worksTrust leaderboard
timezone-convertreal 402 capture
Request
curl -X POST https://timezone-convert.x402supply.com/tools/convert_time \
  -H "Content-Type: application/json" \
  -d '{"time":"2026-03-08 02:30",
       "from":"America/New_York",
       "to":"UTC,Europe/London"}'
402 Payment Required
{
  "x402Version": 2,
  "error": "Payment required",
  "accepts": [{
    "scheme": "exact",
    "network": "eip155:8453",
    "amount": "5000",
    "asset": "0x833589fC...A02913",
    "payTo": "0x07fFB504...8cb754EB",
    "maxTimeoutSeconds": 60,
    ...
  }]
}
200 OK after paying $0.005 (response shape)
# retried with X-PAYMENT: <signed payment payload>
{
  "instant": "2026-03-08T07:30:00.000Z",
  "from": { "status": "nonexistent", "gapMinutes": 60, ... },
  "conversions": [{
    "zone": "Europe/London",
    "localTime": "...",
    "utcOffset": "...",
    "abbreviation": "...",
    "isDst": false
  }],
  "warnings": ["..."]
}

The server quotes the price in a 402. Your agent pays and retries. You get the result. The 200 panel shows field names only.

Tools

14 live tools, 25 HTTP endpoints. Every endpoint takes a POST and answers 402 until paid.

Data and markets

  • Polymarket Snapshot

    Live prediction-market prices, volume and order books in one cited call.

    $0.005 per call

    POSThttps://polymarket-snapshot.x402supply.com/tools/search_markets
    1 more endpoint and MCP
    • POSThttps://polymarket-snapshot.x402supply.com/tools/get_market
    • MCPhttps://polymarket-snapshot.x402supply.com/mcp

    Read-only market data, not financial advice. Prices are a point-in-time snapshot and can change within seconds. Verify on polymarket.com before relying on any figure.

    openapi.json

  • Treasury Yield Curve

    Daily US Treasury par yield curve, 1 month to 30 years. Cited, no LLM.

    $0.005 per call

    POSThttps://treasury-yield-curve.x402supply.com/tools/yield_curve
    1 more endpoint and MCP
    • POSThttps://treasury-yield-curve.x402supply.com/tools/yield_curve_history
    • MCPhttps://treasury-yield-curve.x402supply.com/mcp

    Data from U.S. Treasury; not financial advice. Par yields are published end-of-day and may be revised.

    openapi.json

  • Protocol TVL Brief

    DeFi protocol brief from DefiLlama: TVL, change, chains, fees, audits.

    $0.01 per call

    POSThttps://protocol-tvl-brief.x402supply.com/tools/protocol_brief
    1 more endpoint and MCP
    • POSThttps://protocol-tvl-brief.x402supply.com/tools/find_protocol
    • MCPhttps://protocol-tvl-brief.x402supply.com/mcp

    Informational only, not financial advice. Data is provided by DefiLlama and may be delayed or incomplete. Verify before relying on it.

    openapi.json

  • SEC EDGAR

    Resolve a public company and read its SEC filings in plain English, cited.

    $0.01 per call

    POSThttps://sec-edgar.x402supply.com/tools/resolve_company
    2 more endpoints and MCP
    • POSThttps://sec-edgar.x402supply.com/tools/list_filings
    • POSThttps://sec-edgar.x402supply.com/tools/recent_8k_events
    • MCPhttps://sec-edgar.x402supply.com/mcp

    Informational only, not investment or legal advice. Data comes from SEC EDGAR and may lag the filing by minutes. Verify against the filing before relying on it.

    openapi.json

  • Token Verdict

    Rug-risk grade A-F for any Base ERC20, with evidence per check. No LLM.

    $0.01 per call

    POSThttps://token-verdict.x402supply.com/tools/token_verdict
    MCP endpoint
    • MCPhttps://token-verdict.x402supply.com/mcp

    Automated, rules-based screen of public onchain data. Not financial advice and not a security audit. A pass does not mean a token is safe, and unknown checks are excluded from the score.

    openapi.json

  • Token Facts

    Onchain facts for a Base ERC20: shape, proxy, owner, admin powers.

    $0.005 per call

    POSThttps://token-facts.x402supply.com/tools/token_facts
    MCP endpoint
    • MCPhttps://token-facts.x402supply.com/mcp

    Automated, rules-based screen of public onchain data. Not financial advice and not a security audit. A pass does not mean a token is safe, and unknown checks are excluded from the score.

    openapi.json

Web and security

  • Endpoint Diligence

    Should your agent pay this x402 endpoint? Live trust check before you pay.

    $0.02 per call

    POSThttps://diligence.x402supply.com/tools/check_endpoint
    2 more endpoints and MCP
    • POSThttps://diligence.x402supply.com/tools/compare_price
    • POSThttps://diligence.x402supply.com/tools/reseller_check
    • MCPhttps://diligence.x402supply.com/mcp

    compare_price is free, 30 per IP per day. reseller_check is free, 30 per IP per day.

    openapi.json

  • Page Extract

    URL to clean article text or markdown plus metadata, no LLM.

    $0.01 per call

    POSThttps://page-extract.x402supply.com/tools/page_extract
    MCP endpoint
    • MCPhttps://page-extract.x402supply.com/mcp
    openapi.json

  • HTTP Security Headers Grade

    Grade a public URL's security headers A+ to F with copy-paste fixes.

    $0.01 per call

    POSThttps://http-security-headers-grade.x402supply.com/tools/grade_headers
    MCP endpoint
    • MCPhttps://http-security-headers-grade.x402supply.com/mcp

    Passive header inspection of a single response only. A high grade is not a security audit; it does not test application vulnerabilities.

    openapi.json

Text and records

  • Entity Resolve

    Fuzzy-dedupe records into clusters of likely-duplicate entities.

    $0.02 per call

    POSThttps://entity-resolve.x402supply.com/tools/resolve
    MCP endpoint
    • MCPhttps://entity-resolve.x402supply.com/mcp
    openapi.json

  • HTS Classify

    Classify a product description into candidate HS/HTS10 tariff codes.

    $0.10 per call

    POSThttps://hts-classify.x402supply.com/tools/classify
    1 more endpoint and MCP
    • POSThttps://hts-classify.x402supply.com/tools/classify_bulk
    • MCPhttps://hts-classify.x402supply.com/mcp

    Informational classification aid, not a customs ruling. Verify with a licensed customs broker for binding classification.

    openapi.json

  • PII Redact

    Detect and redact PII in text or JSON.

    $0.02 per call

    POSThttps://pii-redact.x402supply.com/tools/redact
    MCP endpoint
    • MCPhttps://pii-redact.x402supply.com/mcp
    openapi.json

Utilities

  • Chess Eval

    Stockfish evaluation: best move, eval, and principal variation.

    $0.01 per call

    POSThttps://chess-eval.x402supply.com/tools/evaluate_position
    1 more endpoint and MCP
    • POSThttps://chess-eval.x402supply.com/tools/best_line
    • MCPhttps://chess-eval.x402supply.com/mcp
    openapi.json

  • Timezone Convert

    Timezone conversion that flags DST gaps and ambiguous times.

    $0.005 per call

    POSThttps://timezone-convert.x402supply.com/tools/convert_time
    2 more endpoints and MCP
    • POSThttps://timezone-convert.x402supply.com/tools/zone_info
    • POSThttps://timezone-convert.x402supply.com/tools/overlap_hours
    • MCPhttps://timezone-convert.x402supply.com/mcp

    Based on the IANA tz database shipped with the runtime. Governments change rules with short notice; verify critical scheduling against local authorities.

    openapi.json

Trust leaderboard

Free. About 200 x402 endpoints scored daily. Top 5 as of 2026-10-13.

GradeEndpointScorePrice
BOtto AI x402 — Market Intelligence, DeFi & Tradingx402.ottoai.services88/100$0.0010at or below p25
Bbluepages.fyi - Crypto Address ↔ Identity Lookupbluepages.fyi88/100$0.05median-p75
BCompute3.AI - Enterprise AI. Zero Vendor Lock-In.api.compute3.ai88/100$100000.00above p95 (outlier)
Bx402 Echo — Test x402 paymentsx402.payai.network88/100$0.01p25-median
Bapi.remix.liveapi.remix.live80/100n/aprice unavailable
Price position is measured against the endpoint's category.Full leaderboard

How it works

Four steps, one HTTP round trip plus a payment. Full protocol details at x402.org.

  1. Call

    Your agent sends a POST to the tool endpoint, or calls tools/list on the MCP endpoint. Discovery via /openapi.json is free.

  2. Get the 402

    The server answers 402 with price, network, and payTo in the body and the PAYMENT-REQUIRED header.

  3. Pay

    The agent signs a USDC payment on Base for that amount.

  4. Retry

    Resend with the X-PAYMENT header. The result comes back with a settlement receipt.