x402 Observatory
Every paid API in the public x402 directories, checked by LogicNodes: does it really answer with valid payment terms, how reliably, and how much USDC its payout address actually receives.
120,425paid endpoints listed
4,351providers
3,578 / 4,032live at last check / checked
$329,793USDC received on Base, 7 days
| # | Provider | Score | Now | Uptime 72h | Income 7d | Payers 7d | Endpoints | From |
|---|---|---|---|---|---|---|---|---|
| 3651 | Chemistry Calculators chemistry-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 11 | $0.02 |
| 3652 | Chess Notation Tools chess-notation.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3653 | Chinese Calendar and Culture chinese-culture.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3654 | Color and Design Tools color-design.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3655 | Company Enrichment company-enrichment.x402tookit.com |
10.5 | pending | – | shared | 2 | 11 | $0.02 |
| 3656 | Construction Calculators construction-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3657 | Cooking Calculators cooking-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 12 | $0.02 |
| 3658 | Country and Currency Codes country-codes-iso.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3659 | Country Facts country-facts.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3660 | Craft & Maker Calc craft-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3661 | Crypto Math crypto-math.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3662 | CSS Design Calc css-design-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 12 | $0.02 |
| 3663 | Systems Capacity Calculators data-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3664 | Perp Derivatives Signals derivatives.x402tookit.com |
10.5 | pending | – | shared | 2 | 11 | $0.02 |
| 3665 | Dev Reference dev-reference.x402tookit.com |
10.5 | pending | – | shared | 2 | 12 | $0.02 |
| 3666 | Developer Utilities dev-utils.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3667 | Dictionary and Etymology dictionary-wiktionary.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3668 | Domain and DNS Checks domain-dns.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3669 | Electrical Calculators electrical-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3670 | Electronics Calculators electronics-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 11 | $0.02 |
| 3671 | Emoji Tools emoji-tools.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3672 | Environment Screen environment-screen.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3673 | NASA Exoplanets exoplanets-nasa.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3674 | RSS and Atom Feed Reader feed-reader.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.03 |
| 3675 | File Format Inspector file-formats.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3676 | Finance Calculators finance-calculators.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3677 | Fitness and Body Calculators fitness-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3678 | Focus & Sleep Planner focus-sleep-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 5 | $0.02 |
| 3679 | Food Barcode Facts food-barcode.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3680 | FX Rates ECB fx-ecb.x402tookit.com |
10.5 | pending | – | shared | 2 | 3 | $0.02 |
| 3681 | Garden Calculators garden-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3682 | Geo Calc geo-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 12 | $0.02 |
| 3683 | US Geography geo-us.x402tookit.com |
10.5 | pending | – | shared | 2 | 6 | $0.02 |
| 3684 | Global Hazards global-hazards.x402tookit.com |
10.5 | pending | – | shared | 2 | 6 | $0.02 |
| 3685 | Grades & Study Calc grades-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3686 | Graph Algorithms graph-algorithms.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3687 | Hacker News hacker-news.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3688 | Home Energy Calculators home-energy-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3689 | HVAC Airflow & Load Calc hvac-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3690 | Hydrology & Open-Channel Calc hydrology-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3691 | Identifier Validators id-validators.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3692 | Industry and Occupation Codes industry-occupation-codes.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3693 | Investing Math invest-math.x402tookit.com |
10.5 | pending | – | shared | 2 | 12 | $0.02 |
| 3694 | Jewelry Maker Calc jewelry-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3695 | JSON and Data Tools json-data-tools.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3696 | Land Survey Screening land-survey.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3697 | License Intel license-intel.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3698 | Life Dates & Milestones life-dates.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3699 | Linear Algebra linear-algebra.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3700 | LLM Cost & Capacity Calc llm-cost-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
For agents: call
x402_service_search over MCP (https://logicnodes.io/mcp/v2) or POST https://logicnodes.io/v1/tools/x402_service_search {"query":"weather"} to get the best live endpoint with an example input. For sellers: claim your listing, add the badge, or get alerts when your API stops answering (x402_monitor_create, $5 for 30 days). JSON: /v1/observatory/providers.Score: 0-100: 50 x share of checks in the last 72 h that returned valid x402 payment terms + 30 x min(1, log10(1 + USDC received in 7 days) / 4) + 20 x min(1, log10(1 + distinct payers in 7 days) / 3). A provider never checked scores on income only; income is all USDC received by its payout address on Base, whatever the source. Directories read 3 h ago. LogicNodes does not run these services or take a cut.