Agent Tools
List
Back to directory

Ontario Protocol

https://ontarioprotocol.com/api/x402/base/balances
● healthy model-context-protocol-mcp

Find live x402 APIs for any task (0.005 USDC, no match no charge); Base balance, tx and gas reads.

Category
model-context-protocol-mcp
Chains
base
Price
$0.0020 USDC / call

Quality grade

How grading works
A 74.4 / 100
Availability 20.0 / 20
Endpoint responded (HTTP 200)
Payability 15.0 / 15
  • ✓ Answers a real HTTP 402 challenge
  • ✓ Publishes a /.well-known/x402 descriptor
  • ✓ Payment address on record
  • ✓ Settlement network declared
  • ✓ Price declared
Demand 16.4 / 35
27 distinct payers, 56 USDC transfers in the last 30 days
Performance 10.0 / 10
Last probe answered in 104 ms (full marks at 200 ms or less)
Readiness 13.0 / 15
Agent readiness 87/100
Owner verified 0.0 / 5
Nobody has claimed this listing yet
Endpoint last checked 20 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 · 87/100

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 A, 74.4/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements 10/10 Payment requirements carry a payee, a mainnet network and a price.
Live 402 challenge 20/25 Endpoint reachable; its 402 challenge was seen earlier (104 ms).
x402 version n/a x402 version not observed yet.
Signed descriptor n/a No x402 standard defines a signed descriptor.
Uptime (30 days) 15/15 32/32 probes succeeded over 30 days (100%).
Resource declaration 10/10 Declares 7 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 75 points, scaled to 100.
Responsiveness: Responsive (104 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 75% of peers
This listing 87 · peer median 78
Latency
Faster than 86% of peers
This listing 104 ms · peer median 205 ms

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

  • Live 402 challenge −5 — Answer the paid path with a valid 402 challenge.
    Now: Endpoint reachable; its 402 challenge was seen earlier (104 ms).
  • 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.

How many agent tools actually work · All statistics

Paid endpoints

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

POST https://ontarioprotocol.com/api/x402/list-agent

Submit an AI agent for inclusion in the Ontario Protocol directory. Pays 0.10 USDC up front to deter spam.

POST https://ontarioprotocol.com/api/x402/list-service

List your paid API for agents with an Ontario provider profile and Bazaar Launch Passport: a live readiness scan, sanitized Coinbase indexing preflight, five-query buyer-intent audit, optional signed MCP + x402 procurement evidence, distribution bundle, HTML and JSON evidence, badge, 30 days of auto

POST https://ontarioprotocol.com/api/x402/refresh-listing

Run a fresh readiness scan for an existing paid Ontario provider profile after its included 30-day maintenance window and update its public evidence, JSON twin, and badge. The 0.10 USDC fee buys a new observation, not a better grade, ranking, traffic, or metadata edit.

POST https://ontarioprotocol.com/api/x402/find-api

Which x402 API should my agent call? Live API finder for any task. Required: task. Returns up to 5 paid APIs that answered a fresh unpaid probe with a valid Base USDC 402, ranked by task fit, price and Bazaar-reported repeat buyers, each with live price, network and a ready-to-call request. Provider

GET https://ontarioprotocol.com/api/x402/base/balances

Base wallet balance: ETH, USDC and about 25 widely held Base tokens for any address, plus up to 20 ERC-20 token contracts you name, each with symbol, decimals, raw and formatted amount and the block number read, live from Base mainnet RPC. Required: address. $0.002 USDC on Base. Failed read, no char

GET https://ontarioprotocol.com/api/x402/base/tx-check

Verify Base transaction by hash: status, block, timestamp and confirmations, with USDC and ERC-20 Transfers decoded (token, from, to, amount; up to 100 listed, transfers_total gives the full count), any EIP-3009 authorization used, and match flags for an expected payTo and amount, so an x402 payment

GET https://ontarioprotocol.com/api/x402/base/gas

Base gas price: base fee, priority fee p25/p50/p90 over the last 20 blocks, ready-to-sign maxFeePerGas and maxPriorityFeePerGas for slow, normal and fast inclusion, an L1 data-fee upper bound, and the estimated total cost in wei of an ETH transfer and an ERC-20 transfer, live from Base mainnet RPC w

How to call

cURL · x402-fetch / x402-axios will auto-handle 402
curl -sS -i -X GET https://ontarioprotocol.com/api/x402/base/balances  # expect HTTP 402 Payment Required (about 0.002 USDC/call)
MCP endpoint
https://ontarioprotocol.com/mcp
/.well-known/x402.json
https://ontarioprotocol.com/.well-known/x402

Listed in

Directories this entry was found in.

mcp since 2026-06-12 awesome-x402 since 2026-06-21 x402scan since 2026-09-13 a2a since 2026-10-08