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MAMMBA x402 Marketplace

https://x402-sage.vercel.app/proxy/ai-agent-execute
● healthy ai

Multi-tenant API marketplace — pay per request with USDC on Base.

Category
ai
Chains
base
Price
$0.0010–$10.0000 USDC

Quality grade

How grading works
B 56.8 / 100
Availability 20.0 / 20
Endpoint responded (HTTP 402)
Payability 14.0 / 15
  • ✓ Answers a real HTTP 402 challenge
  • ✓ Publishes a /.well-known/x402 descriptor
  • ✓ Payment address on record
  • ✓ Settlement network declared
  • ✗ Price declared
Demand 0.0 / 35
0 distinct payers, 0 USDC transfers in the last 30 days
Performance 10.0 / 10
Last probe answered in 170 ms (full marks at 200 ms or less)
Readiness 12.8 / 15
Agent readiness 86/100
Owner verified 0.0 / 5
Nobody has claimed this listing yet
Endpoint last checked 18 h ago. On-chain activity last read 3 d ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass. This grade sets search order and leaderboards; the readiness score below is shown for reference only.

x402 readiness

B · 84/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B, 56.8/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements 9/10 Findings: missing: price declared.
  • missing: price declared
Live 402 challenge 25/25 Paid endpoint answers with an HTTP 402 challenge (170 ms).
x402 version 5/10 Speaks x402 v1; v2 is current.
Signed descriptor n/a No x402 standard defines a signed descriptor.
Uptime (30 days) 12.66/15 27/32 probes succeeded over 30 days (84%).
Resource declaration 10/10 Declares 77 paid resource(s).
Verified identity 5/10 Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags 5/5 seen in a source within 7 days; declares x402.
Security declaration n/a Payment is the access control for an x402 resource.
Applicable criteria total 85 points, scaled to 100.
Responsiveness: Responsive (170 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).
Payment evidence: x402_challenge — We sent a request and got a live HTTP 402 challenge. Also: x402_manifest, catalog_listing. Qualifies the payment claim; adds no points.
Measured 2026-11-11.
Nine criteria, the same as the A2A readiness score, read from our daily probe of the paid endpoint, its payment requirements and 30-day probe history. Signed descriptor and security declaration are n/a for x402 (payment is the access control), as is an x402 version we have not observed; the remaining points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. It also feeds 15 points of the x402 quality grade.

Compared with peers

Against 10,082 reachable x402 APIs in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.

Readiness
Higher than 68% of peers
This listing 84 · peer median 78
Latency
Faster than 61% of peers
This listing 170 ms · peer median 205 ms

Where it loses the most points, and how to win them back

  • x402 version −5 — Support the current protocol revision.
    Now: Speaks x402 v1; v2 is current.
  • Verified identity −5 — Claim the listing and prove control of its domain.
    Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
  • Uptime (30 days) −2.3 — Stay reachable in our daily probes.
    Now: 27/32 probes succeeded over 30 days (84%).

How many agent tools actually work · All statistics

Paid endpoints

77 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.

https://x402-sage.vercel.app/
https://x402-sage.vercel.app/.well-known/x402
https://x402-sage.vercel.app/admin/endpoints
https://x402-sage.vercel.app/admin/endpoints/:id/activate
https://x402-sage.vercel.app/admin/endpoints/:id/suspend
https://x402-sage.vercel.app/admin/payouts/:id/complete
https://x402-sage.vercel.app/admin/payouts/:id/fail
https://x402-sage.vercel.app/admin/payouts/initiate
https://x402-sage.vercel.app/admin/payouts/pending
https://x402-sage.vercel.app/admin/providers
https://x402-sage.vercel.app/admin/providers/:id/activate
https://x402-sage.vercel.app/admin/providers/:id/suspend
https://x402-sage.vercel.app/admin/stats
https://x402-sage.vercel.app/admin/transactions
https://x402-sage.vercel.app/api/providers/me
https://x402-sage.vercel.app/api/providers/me/endpoints
https://x402-sage.vercel.app/api/providers/register
https://x402-sage.vercel.app/api/workflows/omitempty-enrich
https://x402-sage.vercel.app/health
https://x402-sage.vercel.app/openapi.json

How to call

cURL · x402-fetch / x402-axios will auto-handle 402
curl -sS -i -X GET https://x402-sage.vercel.app/proxy/ai-agent-execute  # expect HTTP 402 Payment Required (about $0.001/call)
/.well-known/x402.json
https://x402-sage.vercel.app/.well-known/x402

Listed in

Directories this entry was found in.

x402scan since 2026-09-13