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.
126,094paid endpoints listed
4,142providers
1,938 / 2,195live at last check / checked
$313,027USDC received on Base, 7 days
| # | Provider | Score | Now | Uptime 72h | Income 7d | Payers 7d | Endpoints | From |
|---|---|---|---|---|---|---|---|---|
| 51 | HubVibe hubvibe-io.com |
72.2 | live | 100% | $141.81 | 7 | 69 | $0.02 |
| 52 | Strale api.strale.io |
71.9 | live | 100% | $128.27 | 7 | 165 | $0.0216 |
| 53 | list-smith list-smith-production.up.railway.app |
71.8 | live | 100% | shared | 9 | 2 | $0.10 |
| 54 | api.loyalspark.online api.loyalspark.online |
71.1 | live | 100% | $11.19 | 86 | 34 | $0.001 |
| 55 | api.cn402.com api.cn402.com |
70.9 | live | 100% | $19.46 | 45 | 51 | $0.0022 |
| 56 | api.x402node.dev api.x402node.dev |
70.9 | live | 100% | $19.46 | 45 | 498 | $0.0022 |
| 57 | IntegrityPhase api.integrityphase.com |
70.6 | live | 100% | $302.64 | 1 | 1 | $11.189438 |
| 58 | agent-referee.fairplayclub.workers.dev agent-referee.fairplayclub.workers.dev |
70.4 | live | 100% | $150.02 | 3 | 13 | $0.01 |
| 59 | agentreferee.ai agentreferee.ai |
70.4 | live | 100% | $150.02 | 3 | 9 | $0.01 |
| 60 | Foundations Elements foundations.tensegrity.works |
70.2 | live | 100% | $100.19 | 5 | 1 | $0.02 |
| 61 | Search airports by name or city airport.openverbs.com |
69.9 | live | 100% | shared | 28 | 3 | $0.002 |
| 62 | Sunrise / sunset astro.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.004 |
| 63 | Bitwise XOR bitwise.openverbs.com |
69.9 | live | 100% | shared | 28 | 7 | $0.002 |
| 64 | Text to braille braille.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.002 |
| 65 | Transaction Receipt API chain.openverbs.com |
69.9 | live | 100% | shared | 28 | 27 | $0.001 |
| 66 | Luhn check checkdigit.openverbs.com |
69.9 | live | 100% | shared | 28 | 5 | $0.002 |
| 67 | Fletcher-16 / Fletcher-32 checksum.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.002 |
| 68 | Molar mass chem.openverbs.com |
69.9 | live | 100% | shared | 28 | 3 | $0.004 |
| 69 | Reaction stoichiometry chemeq.openverbs.com |
69.9 | live | 100% | shared | 28 | 3 | $0.004 |
| 70 | WCAG contrast color.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.002 |
| 71 | Permutations (nPr) combinatorics.openverbs.com |
69.9 | live | 100% | shared | 28 | 5 | $0.004 |
| 72 | Validate a card number creditcard.openverbs.com |
69.9 | live | 100% | shared | 28 | 5 | $0.002 |
| 73 | Total value locked crypto.openverbs.com |
69.9 | live | 100% | shared | 28 | 19 | $0.001 |
| 74 | Unflatten a delimited object data.openverbs.com |
69.9 | live | 100% | shared | 28 | 6 | $0.004 |
| 75 | Parse an ISO 8601 duration datetime.openverbs.com |
69.9 | live | 100% | shared | 28 | 13 | $0.002 |
| 76 | Roll dice dice.openverbs.com |
69.9 | live | 100% | shared | 28 | 3 | $0.002 |
| 77 | Synonyms of a word (thesaurus) dictionary.openverbs.com |
69.9 | live | 100% | shared | 28 | 3 | $0.002 |
| 78 | Student's t distribution distribution.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.004 |
| 79 | Reverse DNS lookup dns.openverbs.com |
69.9 | live | 100% | shared | 28 | 2 | $0.006 |
| 80 | Country imports and exports economy.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.004 |
| 81 | edgar.openverbs.com edgar.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.006 |
| 82 | Validate email email.openverbs.com |
69.9 | live | 100% | shared | 28 | 1 | $0.006 |
| 83 | Parse an SPF record emailauth.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.004 |
| 84 | Search emoji emoji.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.002 |
| 85 | Unicode normalisation encoding.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.002 |
| 86 | Simple / compound interest finance.openverbs.com |
69.9 | live | 100% | shared | 28 | 6 | $0.004 |
| 87 | Validate against a JSON Schema format.openverbs.com |
69.9 | live | 100% | shared | 28 | 5 | $0.004 |
| 88 | Simplify a fraction fraction.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.002 |
| 89 | Exchange rates fx.openverbs.com |
69.9 | live | 100% | shared | 28 | 2 | $0.006 |
| 90 | Geocode an address geocode.openverbs.com |
69.9 | live | 100% | shared | 28 | 1 | $0.006 |
| 91 | Triangle (SSS) geometry.openverbs.com |
69.9 | live | 100% | shared | 28 | 5 | $0.004 |
| 92 | Timezone from coordinate geospatial.openverbs.com |
69.9 | live | 100% | shared | 28 | 15 | $0.002 |
| 93 | Search entities by legal name gleif.openverbs.com |
69.9 | live | 100% | shared | 28 | 3 | $0.006 |
| 94 | Hash data hash.openverbs.com |
69.9 | live | 100% | shared | 28 | 2 | $0.002 |
| 95 | List holidays holidays.openverbs.com |
69.9 | live | 100% | shared | 28 | 2 | $0.002 |
| 96 | Strip HTML to text html.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.002 |
| 97 | Validate IBAN iban.openverbs.com |
69.9 | live | 100% | shared | 28 | 2 | $0.004 |
| 98 | Expand recurrence ical.openverbs.com |
69.9 | live | 100% | shared | 28 | 2 | $0.002 |
| 99 | Inspect a UUID id.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.002 |
| 100 | Singularize inflect.openverbs.com |
69.9 | live | 100% | shared | 28 | 4 | $0.002 |
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 10 h ago. LogicNodes does not run these services or take a cut.