Pay-per-call AI media and inference, no API key

13 routes on Cloudflare Workers AI, paid per call in USDC on Base with the x402 protocol. Prices from $0.001 to $5.00. No account, no key, no subscription; the first request answers 402 with the exact terms.

Routes and prices

Every paid route takes a JSON body by POST. Unpaid GET, HEAD and POST all answer 402 with the same terms. Limits and the fallback rules are on pricing; each sample shows a request and a response.

How to pay

Send the request. The answer is 402 Payment Required with an accepts list: scheme exact, network Base (eip155:8453), asset USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, payTo 0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c, amount in USDC atomic units (10000 = $0.01). Sign the EIP-3009 authorization for that amount and resend the identical request with the X-PAYMENT header (v1) or PAYMENT-SIGNATURE (v2). The facilitator (facilitator.payai.network) verifies and settles on chain, the model runs, and the response carries PAYMENT-RESPONSE. Any x402 client works (x402-fetch, @x402/fetch, Coinbase AgentKit). If the model fails after settlement the call answers 502 and the same X-PAYMENT is honoured once more within 10 minutes (terms).

curl -s -X POST https://media.agentexchange.work/image -H 'content-type: application/json' -d '{"prompt":"a lighthouse at dawn"}'
# -> 402 {"x402Version":1,"accepts":[{"scheme":"exact","network":"base","maxAmountRequired":"20000","payTo":"0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c",...}]}
curl -s -X POST https://media.agentexchange.work/image -H 'content-type: application/json' -H "X-PAYMENT: $SIGNED" -d '{"prompt":"a lighthouse at dawn"}'
# -> 200 {"image_base64":"/9j/...","mime":"image/jpeg","model":"@cf/black-forest-labs/flux-1-schnell","seed":null,"steps":4,"took_ms":2900}

Models

All inference runs on this account's Workers AI binding; the model ids below were checked against the Workers AI catalog on 2026-09-30 (each model page answered 200). Unit prices are Cloudflare's list prices from the pricing page (fetched 2026-09-30 23:17 UTC); pricing sets them against ours.

Three ids requested for this host are no longer in the catalog and were substituted: @cf/meta/llama-3.1-8b-instruct → @cf/meta/llama-3.1-8b-instruct-fp8; @cf/facebook/bart-large-cnn → @cf/meta/llama-3.1-8b-instruct-fp8 with a summarization prompt; @cf/unum/uform-gen2-qwen-500m → @cf/meta/llama-3.2-11b-vision-instruct as the caption fallback.

Today

Counts for 2026-10-02 UTC from KV; totals for the last days in live.json. Money is not counted here: settlements are on chain to 0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c.

Machine access

/.well-known/x402 (every paid route with the same prices as the challenges) · /openapi.json (OpenAPI 3.1 with x-payment-info) · /.well-known/agent-card.json (A2A, one skill per route) · /a2a (A2A JSON-RPC: message/send, tasks/get; paid skills return the x402 terms as an input-required task) · /llms.txt · /mcp (Streamable HTTP MCP; paid tools return payment instructions) · /samples · /live.json · /health