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
$331,831USDC received on Base, 7 days
| # | Provider | Score | Now | Uptime 72h | Income 7d | Payers 7d | Endpoints | From |
|---|---|---|---|---|---|---|---|---|
| 3701 | Locale and Formatting Tools locale-tools.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3702 | Machining & Fasteners Calc machining-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3703 | Map Tile Maths map-tiles.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3704 | Marine Conditions marine-conditions.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3705 | Market and Holiday Calendar market-calendar.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3706 | Markup and Text Extraction Tools markup-tools.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3707 | Algebra and Geometry Solvers math-geometry.x402tookit.com |
10.5 | pending | – | shared | 2 | 11 | $0.02 |
| 3708 | Math and Statistics math-stats.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3709 | Medical Codes and Drug Names medical-codes.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3710 | Machine Learning Metrics ml-metrics.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3711 | Music Production Calc music-production-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3712 | Music Theory music-theory.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3713 | NASA Media Library nasa-media.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3714 | Network Calc network-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 12 | $0.02 |
| 3715 | Number Words number-words.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3716 | Open Search open-search.x402tookit.com |
10.5 | pending | – | shared | 2 | 5 | $0.02 |
| 3717 | Package Health package-health.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3718 | Package Registries package-registries.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3719 | Paper & Print Calc paper-print-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3720 | Party & Event Planner party-event-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3721 | Pet Care Calc pet-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3722 | Phone Number Tools phone-tools.x402tookit.com |
10.5 | pending | – | shared | 2 | 5 | $0.02 |
| 3723 | Photography Calculators photo-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 5 | $0.02 |
| 3724 | Physics Calculators physics-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 1 | $0.02 |
| 3725 | Plumbing & Pipe Flow Calc plumbing-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 2 | $0.02 |
| 3726 | Portfolio Stats portfolio-stats.x402tookit.com |
10.5 | pending | – | shared | 2 | 1 | $0.02 |
| 3727 | Probability Calculators probability-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 5 | $0.02 |
| 3728 | Publishing Calc publishing-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 4 | $0.02 |
| 3729 | Puzzle Solvers puzzle-solvers.x402tookit.com |
10.5 | pending | – | shared | 2 | 3 | $0.02 |
| 3730 | Radio & RF Calc radio-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 1 | $0.02 |
| 3731 | Recurrence Rules (RRULE) recurrence-rules.x402tookit.com |
10.5 | pending | – | shared | 2 | 4 | $0.02 |
| 3732 | Research Paper Checks research-papers.x402tookit.com |
10.5 | pending | – | shared | 2 | 2 | $0.02 |
| 3733 | Satellite Catalog satellite-catalog.x402tookit.com |
10.5 | pending | – | shared | 2 | 3 | $0.02 |
| 3734 | Scripture Lookup scripture.x402tookit.com |
10.5 | pending | – | shared | 2 | 4 | $0.02 |
| 3735 | SEC Filing Search sec-search.x402tookit.com |
10.5 | pending | – | shared | 2 | 2 | $0.02 |
| 3736 | Security Math security-math.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3737 | Shipping & Logistics Calc shipping-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 8 | $0.02 |
| 3738 | Site Audit site-audit.x402tookit.com |
10.5 | pending | – | shared | 2 | 4 | $0.03 |
| 3739 | Site Climate site-climate.x402tookit.com |
10.5 | pending | – | shared | 2 | 9 | $0.02 |
| 3740 | Sun, Moon and Planets sky-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 1 | $0.02 |
| 3741 | Space Weather space-weather.x402tookit.com |
10.5 | pending | – | shared | 2 | 1 | $0.02 |
| 3742 | Sports Calculators sports-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 4 | $0.02 |
| 3743 | Star Catalog star-catalog.x402tookit.com |
10.5 | pending | – | shared | 2 | 2 | $0.02 |
| 3744 | Statistical Tests stats-tests.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3745 | Structural and Beam Calculators structural-calc.x402tookit.com |
10.5 | pending | – | shared | 2 | 4 | $0.02 |
| 3746 | Supplier Check supplier-check.x402tookit.com |
10.5 | pending | – | shared | 2 | 1 | $0.75 |
| 3747 | Classic Ciphers and Encodings text-ciphers.x402tookit.com |
10.5 | pending | – | shared | 2 | 4 | $0.02 |
| 3748 | Text Analysis Tools text-metrics.x402tookit.com |
10.5 | pending | – | shared | 2 | 7 | $0.02 |
| 3749 | Text Similarity text-similarity.x402tookit.com |
10.5 | pending | – | shared | 2 | 10 | $0.02 |
| 3750 | Thermodynamics and Heat Transfer thermo-heat-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 5 h ago. LogicNodes does not run these services or take a cut.