○

OpenZoo

AI PAYMENT-READY

payment-ready until 2026-09-17

OpenAI-compatible LLM inference paid per request via x402 — no account or API key. Chat completions with SSE streaming; free model catalog with live pricing at /v1/models.

Pay from $0.003234 to $0.004311 per request in USDC on Arbitrum One / Base / Polygon / Solana, settled onchain via the x402 protocol, no signup, no API key needed.

measured since 2026-08-25 (start of our harvest window) · $335.65 all-time · settled via coinbase, accrue

BASE URL https://api.openzoo.fun │ WEBSITE https://openzoo.fun │ ENDPOINTS 1 │ NETWORK Arbitrum One / Base / Polygon / Solana │ ASSET USDC │ MEMBER SINCE 2026-09-02 │ MONITORED SINCE 2026-09-02

VERDICT

ranking generation 3

mixed 74/100 #94 of 114 in AI by measured score

What the score read on this service: status offline, 95.9% uptime 30d, 4685ms response p95, x402 compliance 14 of 14, $0.003234 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.

The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.

It is a score inside AI, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 114 listings, this one among them. That set is wider than the 114 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.

Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.

ALTERNATIVES IN AI

Other AI services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).

Ranked alternative x402 services in the same category, with band, measured score, 30-day uptime and 30-day on-chain settlement volume
SERVICE	BAND	SCORE	UPTIME 30D	VOL 30D
Otto AI	strong	95	100%	$61.64
x402engine	strong	93	100%	$27.16
Agent402.tools	solid	92	98.8%	$136.08
StableEmail	solid	89	100%	$27.48
Exa	solid	89	100%	$45.99

5 of 113 other ranked services in AI · see the whole category

ASSESSMENT

updated 59m ago

The parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.

reliability 95.9%

uptime 24h: 0%
uptime 7d: 88.6%
uptime 30d: 95.9%
uptime 90d: 95.9%
response p95: 4685ms
avg response: 1795ms
total checks: 677

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

compliance A (14/14)

14 of 14 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.003234 to $0.004311 (p26 in AI)

price (min): $0.003234
price (max): $0.004311
category percentile (min): p26 in AI
category percentile (max): p11 in AI
endpoints / prices: 1 / 2
model: tiered
stability: 87%

risk clean

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

domain age: -
registrar: -
hosting: custom
domain created: ---

Identity facts, not a risk score.

traction $335.375443 30d · 12 buyers

volume 30d: $335.375443
buyers 30d: 12
settlements 30d: 1,768
measured since: 2026-08-25 (start of our harvest window)
last settlement: 2026-09-09
top buyer share: 63% of 30d volume
trend 7d vs 30d: 2.90x the 30d daily rate
networks: eip155:137, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time: $335.65
settlements all-time: 3,426
median settlement 30d: $0.181742
max settlement 30d: $20.61639
settled via: coinbase ($223.78, 814 tx), accrue ($111.59, 954 tx)

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share is a concentration signal, not part of the ranking score.

CHANGES

10 in 30d

Payout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.

changes schema changed 4d ago (10 in 30d)

schema changed · 4d ago

schema removed POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 120 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema added POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 120 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema changed · 4d ago

schema removed POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 120 {"feePayer":"D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"}

schema added POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 120 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema changed · 5d ago

schema added POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 120 {"feePayer":"D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"}

schema changed · 5d ago

schema removed POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 120 {"feePayer":"BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP"}

price changed · 5d ago

POST /v1/chat/completions · eip155:10 · USD Coin: 2155 → 2156

POST /v1/chat/completions · eip155:137 · USDC: 2155 → 2156

POST /v1/chat/completions · eip155:42161 · USD Coin: 2155 → 2156

POST /v1/chat/completions · eip155:4663 · Global Dollar: 2155 → 2156

POST /v1/chat/completions · eip155:480 · USDC: 2155 → 2156

POST /v1/chat/completions · eip155:8453 · USDC: 2155 → 2156

POST /v1/chat/completions · solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp · USDC: 2155 → 2156

schema changed · 5d ago

schema removed POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 120 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 120 {"feePayer":"BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP"}

schema changed · 5d ago

price changed · 5d ago

POST /v1/chat/completions · eip155:10 · USD Coin: 2152 → 2155

POST /v1/chat/completions · eip155:137 · USDC: 2152 → 2155

POST /v1/chat/completions · eip155:42161 · USD Coin: 2152 → 2155

POST /v1/chat/completions · eip155:4663 · Global Dollar: 2152 → 2155

POST /v1/chat/completions · eip155:480 · USDC: 2152 → 2155

POST /v1/chat/completions · eip155:8453 · USDC: 2152 → 2155

POST /v1/chat/completions · solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp · USDC: 2152 → 2155

schema changed · 5d ago

schema removed POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp 5xgsnby6P9zqGK71J7H4yJLxzqPvNbC7rDZxNzjHmj7e UNKNOWN 2 120 {"feePayer":"WzMaL78srutrF6CsxEkWuhMaDF5HZA6jNRaEPengqpb"}

schema removed POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 120 {"feePayer":"WzMaL78srutrF6CsxEkWuhMaDF5HZA6jNRaEPengqpb"}

schema removed POST /v1/chat/completions exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EVULoNF4DeMBN4dGiZiDfpiiTfNZgoCvXWWgaV3epump UNKNOWN 2 120 {"feePayer":"WzMaL78srutrF6CsxEkWuhMaDF5HZA6jNRaEPengqpb"}

price changed · 5d ago

POST /v1/chat/completions · eip155:10 · USD Coin: 4304 → 2152

POST /v1/chat/completions · eip155:137 · USDC: 4304 → 2152

POST /v1/chat/completions · eip155:42161 · USD Coin: 4304 → 2152

POST /v1/chat/completions · eip155:4663 · Global Dollar: 4304 → 2152

POST /v1/chat/completions · eip155:480 · USDC: 4304 → 2152

POST /v1/chat/completions · eip155:8453 · USDC: 4304 → 2152

POST /v1/chat/completions · solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp · USDC: 4304 → 2152

Amounts are on-wire atomic units in the named asset.

see all changes for this service

WHAT IT DOES

ai-derived

No AI synthesis has been produced for this service yet.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD	PATH	DESCRIPTION	PRICE	NETWORK	ASSET	402 CHANNEL
POST	/v1/chat/completions		$0.003234	Arbitrum One/Base/Polygon/Solana	USDC	header

1 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to POST /v1/chat/completions returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request

curl -i -X POST 'https://api.openzoo.fun/v1/chat/completions'

// 402 response (captured by monitor) · 1 payload · click to expand

[
  {
    "error": "payment required — pay by card at https://whop.com/staccoverflow/openzoo/, or run `npx openzoo` locally to pay per call automatically, or pay this 402 via x402 (see `help`)",
    "accepts": [
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "58AgxZtxYkAzgcGktVyajR7zYi9k4kJmaG94XvwpSasK"
        },
        "payTo": "58AgxZtxYkAzgcGktVyajR7zYi9k4kJmaG94XvwpSasK",
        "amount": "3234",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 120
      },
      {
        "asset": "EVULoNF4DeMBN4dGiZiDfpiiTfNZgoCvXWWgaV3epump",
        "extra": {
          "feePayer": "58AgxZtxYkAzgcGktVyajR7zYi9k4kJmaG94XvwpSasK"
        },
        "payTo": "58AgxZtxYkAzgcGktVyajR7zYi9k4kJmaG94XvwpSasK",
        "amount": "11626336",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 120
      },
      {
        "asset": "5xgsnby6P9zqGK71J7H4yJLxzqPvNbC7rDZxNzjHmj7e",
        "extra": {
          "feePayer": "58AgxZtxYkAzgcGktVyajR7zYi9k4kJmaG94XvwpSasK"
        },
        "payTo": "58AgxZtxYkAzgcGktVyajR7zYi9k4kJmaG94XvwpSasK",
        "amount": "12135458440",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 120
      },
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x26E8134eCC3af5cCE32f34B03E7BD2f318B25158",
        "amount": "3234",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 120
      },
      {
        "asset": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
        "extra": {
          "name": "Global Dollar",
          "version": "1"
        },
        "payTo": "0x26E8134eCC3af5cCE32f34B03E7BD2f318B25158",
        "amount": "4311",
        "scheme": "exact",
        "network": "eip155:4663",
        "maxTimeoutSeconds": 120
      },
      {
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x26E8134eCC3af5cCE32f34B03E7BD2f318B25158",
        "amount": "3234",
        "scheme": "exact",
        "network": "eip155:137",
        "maxTimeoutSeconds": 120
      },
      {
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x26E8134eCC3af5cCE32f34B03E7BD2f318B25158",
        "amount": "3234",
        "scheme": "exact",
        "network": "eip155:42161",
        "maxTimeoutSeconds": 120
      },
      {
        "asset": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x26E8134eCC3af5cCE32f34B03E7BD2f318B25158",
        "amount": "3234",
        "scheme": "exact",
        "network": "eip155:10",
        "maxTimeoutSeconds": 120
      }
    ],
    "resource": {
      "url": "https://api.openzoo.fun/v1/chat/completions",
      "mimeType": "application/json",
      "description": "google/gemini-2.5-flash — ceiling; reconciled to actual cost after the call, at 2026-09-10T03:42:23.622Z",
      "serviceName": "x402-tokens"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "model": "google/gemini-2.5-flash",
              "messages": [
                {
                  "role": "user",
                  "content": "<prompt>"
                }
              ],
              "max_tokens": 256
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "id": "<generation id>",
              "usage": {},
              "choices": [
                {
                  "message": {
                    "role": "assistant",
                    "content": "<completion>"
                  }
                }
              ]
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "properties": {}
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/openzoo/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.

UPTIME

30d UPTIME 95.9%

RESPONSE TIME

AVG RESP 1795ms

PRICE (captured 402, USD)

SUB-SCORES (uptime + x402 compliance)

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

PILLARS OVER TIME (measured)

price percentile in AI

site signals present (of 6)

Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.

VOLUME (on-chain settlement, USD)

DISTINCT BUYERS

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-09-10 · last up 2026-09-10

402 payload captured
accepts[] array present
payTo address recoverable
payTo at accepts[0].payTo (conformant shape)
payTo is a valid on-chain address
atomic price declared
atomic price in a sane range
asset (token) address declared
network resolves to CAIP-2
payment scheme declared
served over HTTPS
declares the current x402 version (2)
EIP-712 domain parameters present on every EVM entry
x402 v2 envelope delivered in the payment-required header

SITE PILLARS

homepage reachable
openapi doc
pricing page
llms.txt
robots.txt
terms page

recent checks (18) live · click to expand

TIME STATUS RESP CAUSE

01:22:00 UTC ○ DOWN 175ms bad_status: unexpected HTTP 401

19:21:03 UTC ○ DOWN 347ms bad_status: unexpected HTTP 401

13:20:01 UTC ○ DOWN 884ms bad_status: unexpected HTTP 401

07:19:00 UTC ○ DOWN 146ms bad_status: unexpected HTTP 401

01:18:18 UTC ○ DOWN 687ms bad_status: unexpected HTTP 401

19:17:00 UTC ○ DOWN 54ms bad_status: unexpected HTTP 401

13:16:00 UTC ○ DOWN 524ms bad_status: unexpected HTTP 401

07:15:00 UTC ○ DOWN 61ms bad_status: unexpected HTTP 401

01:14:00 UTC ○ DOWN 269ms bad_status: unexpected HTTP 401

19:13:00 UTC ○ DOWN 375ms bad_status: unexpected HTTP 401

13:12:21 UTC ○ DOWN 599ms bad_status: unexpected HTTP 401

07:11:00 UTC ○ DOWN 350ms bad_status: unexpected HTTP 401

01:10:00 UTC ○ DOWN 333ms bad_status: unexpected HTTP 401

19:09:00 UTC ○ DOWN 366ms bad_status: unexpected HTTP 401

13:08:00 UTC ○ DOWN 371ms bad_status: unexpected HTTP 401

09:07:00 UTC ○ DOWN 184ms bad_status: unexpected HTTP 401

07:06:00 UTC ○ DOWN 349ms bad_status: unexpected HTTP 401

06:05:00 UTC ○ DOWN 539ms bad_status: unexpected HTTP 401

EMBED THIS BADGE

Show that OpenZoo is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

status

OpenZoo uptime on x402-list — live uptime

// HTML

<a href="https://x402-list.com/services/openzoo?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/openzoo.svg" alt="OpenZoo listed on x402-list" height="28">
</a>

// Markdown

[![OpenZoo on x402-list](https://x402-list.com/badge/openzoo.svg)](https://x402-list.com/services/openzoo?utm_source=badge&utm_medium=referral&utm_campaign=embed)

// HTML · live uptime variant

<a href="https://x402-list.com/services/openzoo?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/openzoo.svg?data=uptime" alt="OpenZoo uptime on x402-list" height="28">
</a>

RUN THIS SERVICE?

Keep this listing accurate: propose changes to the name, description, website, category or add new endpoints to monitor. Ownership is verified with a domain proof and every change is reviewed manually; measured data stays read-only.

[ update this listing ]

Earn the verified tier: x402list pays a real call to this endpoint and, if it delivers, the service is delivery-verified. The fee covers the cost of the probe, not the badge; there is no refund if the call does not deliver. Agent and API only, no in-browser signing. See /api.

[ verify this service ($0.25) ]

To request delisting, email info@x402-list.com or update your listing at /services/openzoo/update.